WO2012140495A2

WO2012140495A2 - Integrated motor and generator

Info

Publication number: WO2012140495A2
Application number: PCT/IB2012/000729
Authority: WO
Inventors: Gerald Goche
Original assignee: Gerald Goche
Priority date: 2011-04-11
Filing date: 2012-04-11
Publication date: 2012-10-18
Also published as: WO2012140495A3

Abstract

An alternating current electric motor and integrated induction generator, sharing the same frame and magnetic core. Both components work together utilizing the same magnetic field, rotor, stator and shaft. Both components are connected to the same power line and simultaneously utilize an outside power source to convert electrical power into mechanical force and/or mechanical force into electrical power. Each of the electrical circuits is, but inter-related with respect to the magnetic circuit they create to function. The motor component of the machine, which converts electrical power into mechanical force, has priority on the use of the available magnetic material. When the motor component is not solicited, the generator component has the use of the majority of the magnetic material. The advantage of such a configuration is dual functionality and near-zero energy waste when utilized as a motor and energy produced when used as a generator.

Description

INTEGRATED MOTOR AND GENERATOR

FIELD OF INVENTION

This invention relates to the field of rotating electrical machines or, in other words, electrical induction device.

BACKGROUND OF THE INVEN ION

An electric motor converts electrical energy into mechanical rotating force. An induction generator converts mechanical rotating force into electrical energy. To do so it needs to produce a rotating magnetic field. This is achieved by assembling laminations plate together in a static device (the stator) and assembling another stack of laminations on a rotating axel (the rotor) . The stator, like the rotor, has a wiring circuit (the stator winding) and the rotor has another wiring circuit (called the rotor winding or squirrel cage, hereafter) . The rotating magnetic field is obtained by arranging an electromagnetic circuit with a determined References of north and south poles in the circumference of the stator. core. When electrically energized with a desired frequency the stator drives the rotor into the predetermined rotating speed. The strength of the rotating magnetic field is designed to match the desired torque and horse power needed for the intended task.

More specifically, motors can be designed to be powered by single phase or three phase power. In the case of single phase power only two circuits are required, one main or permanent winding and one starting circuit. Sometimes depending on the requested duty a starting or a permanent capacitor (or both) is needed do either help for the start, or to maintain the second winding in the circuit after the start sequence. In the case of a three phase power, three circuits are required. One per phase, laid physically 120° equidistant from one and other in the magnetic core to create a three phase rotating magnetic field. All circuits of either single phase or three phases are connected to the incoming power line; all circuits are sized in impedance and cross section size to withhold the available incoming voltage as well as the necessary current draw.

Multiple designs as well as multiple circuits arrangements exist, and some are more or less efficient in the way they utilize the incoming power source. Each motor needs electrical energy to be produced to run. The reality is that the electric motor remains the only electrical device that is not capable of utilizing all the power that it receives. For this very reason, power plants must produce energy in excess to compensate for that waste .

An induction electric motor is designed to produce its full available horse power and torque at the very instant that it is energized. It is usually designed for a single speed and a maximum load. Dividing the electrical power entering the motor by the mechanical force available on the motor shaft gives an efficiency ratio. Today's induction motors are designed and laboratory tested for close to 95% efficiency. Unfortunately the actual field requirements in our industries never match laboratory conditions. If most induction motors are rated 88% to 95% efficient at 90% to 95% of the rated load, the field actual loads and conditions are continuously changing matching whatever productions requirements are out there. Also the incoming voltage and frequency is fluctuating. The voltage can be very much unbalanced from one phase to another and other elements like harmonics can also bring lots of perturbations in the local power supplies, thus the desired and designed for 88% to 95% efficiency is not found in most of the actual field duty cycles conditions.

In an effort to compensate for this enormous waste, major manufactures have developed various designs, such as variable speed and frequency drives which are designed to reduce motor RPM when full speed is not needed in the motor work process. When motor speed is reduced, the torque demand on the shaft is reduced by the cube of the reduced speed. Accordingly, less horse power is required on the motor shaft and less energy is needed to keep the motor running. This solution is great but many industrial processes where the motors are installed do not allow speed reductions. Other devises like soft starts also reduce motor energy waste during the starting sequences and high pick demands, but are not suitable for many applications. It is to be noticed that these available options are separate external additional electronic devices to be added to the motors. The existing electric motors, even the latest IE2 and IE3 , are not capable of producing any of the above described benefits by themselves or without these described electronic devices.

Motors are incapable of using substantially all the power they receive because of the way the induction motor is designed. The motor cannot adapt to either load and/or speed variation and cannot reduce its initial starting current in an efficient and reliable way by itself. When power is applied to the motor leads, the motor is instantly ready to produce full capability in torque and horse power, whether the demand on the shaft requires it or not. This phenomenon produces the waste. Motors are used to drive various devices like pumps, conveyor belts, compressors, hydraulic systems...etc . The size, speed, torque and duty requirements of the driven device is often very complex and far from matching the available motor capabilities. For safety, reliability and production reasons motors are often oversized. All this makes it practically impossible to find the perfect motor that would waste minimum energy because businesses and production imperatives do not help trying to be exactly in the sweet spot where motors would be used between 90% and 95% of the rated loads.

Inside an induction electric motor is a magnetic core and a winding. When energized, the rotating magnetic field is immediately created and it remains fully energized and available at all times. Nothing inside an induction motor is related to what is happening outside, thus the motor cannot adapt to changing demands .

Multiple inventors, engineers and companies have developed different solutions to reduce this enormous waste, like using capacitors to absorb the wasted energy and preventing it from travelling back to the power lines . Some even added extra windings connected in parallel or in series with or without capacitors trying to limit this enormous waste. Although partially successful, waste is still there for a great part.

SUMMARY OF INVENTION

An object is to prevent the above drawbacks.

As a consequence, it is presently proposed to adopt a dramatically different approach for a more viable solution. An induction motor and an induction generator both have respective windings and respective electromagnetic circuits and respective rotating magnetic fields. Until now they have been built separately because they have different functions and properties, and the generator needs an external mechanical driver to give it a rotating movement. Producing power is converting mechanical force into electrical energy. In one aspect, the invention, therefore suggest to include a second electromagnetic rotating field in an induction motor core.

In the induction motor magnetic field, not all the iron part of the core is used at all time, especially when the load demand on the shaft is less than the rated one. For that very reason, part of the core is doing nothing in lighter load situations, and is in fact creating this wasted energy in the form of reactive power and sending it back in the same power lines that feed the motor .

Consequently, in one aspect, the proposed electrical induction device is a rotative machine comprising :

an induction electric motor having a motor winding circuit,

an induction electric generator having a generator winding circuit,

- a magnetic stator core, and,

- a magnetic rotor core,

wherein said magnetic stator and magnetic rotor cores are formed as a single and same core having a magnetic material, so that said motor winding circuit and generator winding circuit share the same magnetic material . As expressed above :

- an induction electric motor is presently defined as a device converting electrical energy (transmitted from incoming electrical power lines which the motor winding circuit is connected to) into mechanical rotating force, only (typically provided to an output shaft mechanically connected to the magnetic stator core) , and, an induction electric generator is presently defined as a device converting mechanical rotating force into electrical energy, only.

In other words, the proposed device will preferably comprise an induction electric motor and an induction generator built as one single unit using (built as) a single unique and same magnetic core, so that device will be able to simultaneously produce a rotating mechanical force on an output shaft and produce an electrical available energy.

For reducing to practice the above device, it is recommended that the magnetic rotor core extends in said output shaft for transmitting the output mechanical power .

According to another aspect, the proposed electrical induction device will preferably comprise :

- an induction electric motor having a motor winding circuit,

an induction electric generator having a generator winding circuit,

- a magnetic rotor core,

wherein the induction electric generator and induction electric motor both share said magnetic rotor core which is single and common thereto. According to a further aspect, the proposed electrical induction device will preferably comprise concentrically, from the inside to the outside, a magnetic rotor core and a magnetic stator core within which are concentrically disposed from the inside to the outside an induction electric generator and an induction electric motor.

According to a further aspect, the proposed electrical induction device will preferably comprise :

- an induction electric motor having a motor winding circuit,

an induction electric generator having a generator winding circuit, and,

- a magnetic stator core,

wherein the magnetic stator core comprises a series of successive stator slots, each having a bottom and a open top, for disposing therein windings, and, within each of the slots of said series:

- a portion of the generator winding circuit is disposed near the bottom,

- and a portion of the motor winding circuit is disposed near the open top.

- an induction electric motor having a motor winding circuit,

an induction electric generator having a generator winding circuit, and,

- a magnetic stator core,

wherein : both the induction electric motor and the induction electric generator have a first, a second and a third electric phases,

- the device comprises an axis of rotation, and, - the respective first, second and third electric phases of the motor winding circuit are angularly positioned identical to the respective first, second and third electric phases of the induction electric motor, around said axis.

an induction electric motor having a motor winding circuit,

an induction electric generator having a generator winding circuit, and,

- a magnetic stator core, wherein :

both the induction electric motor and the induction electric generator have north and south successive magnetic poles,

- the device comprises an axis of rotation, and, the respective north and south successive magnetic poles of the motor winding circuit are angularly positioned identical to the respective north and south successive magnetic poles of the induction electric motor, around said axis.

Advantageously, in at least one of the above-cited configuration :

both the induction electric motor and the induction electric generator have three electric phases, and/or the induction electric generator and induction electric motor both share said magnetic rotor core which is single and common thereto, and/or

- the device will comprise a series of north and south successive magnetic poles wherein at the location of a determined magnetic pole of said series of north and south magnetic poles, both the motor winding circuit and the generator winding circuit are wound together around said determined magnetic pole, and/or

- the magnetic stator core will comprise a series of successive stator slots, and, at the location of a determined slot of said series of successive stator slots, both the motor winding circuit and the generator winding circuit are wound together and electrically insulated from one another, for producing an electrical transformer effect therebetween, and/or

- the device will comprise a series of successive north and south magnetic poles, each defined by a part of the magnetic stator core extending between at least two stator slots of a series of successive stator slots made in said magnetic stator core, wherein, at the location of a determined slot of said series of successive stator slots, both the motor winding circuit and the generator winding circuit are wound together around said part of the magnetic stator core and electrically insulated from one another, for producing an electrical transformer effect therebetween, and/or,

the motor winding circuit will have first terminals connected to incoming electrical power lines, and the generator winding circuit has second terminals connected to said incoming electrical power lines through at least one capacitor, and/or, - the generator winding circuit will have terminals connected to incoming electrical power lines through at least one capacitor having a predetermined value adapted as a function of an electrical current to be produced by the generator winding circuit, and/or,

- the generator winding circuit will include at least one capacitor interposed between a first terminal of two portions of the generator winding circuit, and, a second terminal of each of said two portions will be electrically connected to one of incoming electrical power lines and terminals of the motor winding circuit, and/or,

- during a starting sequence of the device :

* at a first step, the motor winding circuit is starting in a series configuration for a predetermined period of time and simultaneously, the generator winding circuit will be in a parallel configuration and produces a maximum electrical current, and,

* at a second step, the motor winding circuit will go to a parallel configuration, while the generator winding circuit will remain in the parallel configuration, so that the starting electrical inrush current of the motor winding circuit is less two times the nominal electrical current of the motor winding rated circuit, and/or,

- during a starting sequence of the device :

- at a first step, the phases of the motor winding circuit only will be connected in a series configuration, through contactors, and then, II

- at a second step, the phases of the motor winding circuit only will be connected in a parallel configuration, through said contactors.

BRIEF DESCRIPTION OF THE DRAWINGS

For a fuller understanding of the invention, reference should be made to the following detailed description, taken in connection with the exemplary accompanying drawings, in which:

- figure 1 is a diagrammatic representation of a standard induction motor and/or generator circuit, delta connected, of the prior art;

- figure 2 is a base linear wiring diagram of an illustrative embodiment of the newly proposed device;

- figure 3 is a diagrammatic representation of what would be required to construct a device that would have the attributes using conventional rotating electrical machines of the prior art ;

- figure 4 is a diagrammatic representation of a single-frame integrated device according to one embodiment of the newly proposed device;

- figure 5 is a diagrammatic representation of a less than two times the inrush current integrated device according to one embodiment of the newly proposed device; and

- figure 6 is the second diagrammatic representation of a less than two times inrush current integrated device according to an alternate embodiment of the newly proposed device;

- figure 7 is a cross section representation of the newly proposed device;

- figure 8 is a cross section representation of one slot of the newly proposed device; - figure 9 is cross section representation of two slot of the newly proposed device;

- figure 10 is a simplified diagrammatic physical layout representation of one phase of each respective motor and generator coils of the newly proposed device showing the stator magnetic stator core having four poles and the magnetic rotor core.

Figure 11 is and actual stator core of the invention exhibiting the respective motor and generator winding being installed in the stator magnetic core.

Figure 12 represents a winding diagram of the newly proposed device and its specific respective positioning imperatives in regards to north and south magnetic poles and the respective electrical phases of each of the motor and generator winding circuits.

DETAILS ABOUT THE INVENTION

In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings, which form a part hereof, and within which are shown by way of illustration specific embodiments by which the invention may be practiced. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the invention

The inventive device accordingly in the motor circuits includes winding with a certain amount of predetermines north and south poles, a magnetic iron core and the ability to maintain the desired speed to generate a stable frequency for the generator circuit and for the rated and desired task to be produced on the shaft. The physical size of the winding in an induction electric motor of the invention is reduced and the output horse power of that motor is re-determined to be somewhat less compared to a standard induction electric motor of the prior art . This provides room inside the motor core to insert the specific generator winding circuit of the inventing device. The result is an independent generator winding circuit both inside the same magnetic core system, stator and rotor.

The rotor must be in movement matching the required frequency. This is achieved by energizing the motor leads as the motor winding will take the rotor at whatever speed it is designed for and keep it there as long as power is supplied. There is no hard electrical connection between the motor and the generator winding circuits of the invention, but the fact that both winding are physically located in the same core creates an electrical transformer effect between the motor and the generator winding circuits, that induces a voltage into the generator winding. This inductive circuit will produce an output voltage that will have a value proportional to the turn/volt ratio of the two windings . For that matter any voltage can be chosen as output voltage as needed. The output frequency can also be changed and predetermined at the initial design of the generator winding by simply changing the amount of pole of the generator winding. About the available wattage that the generator winding can produce, this will be directly proportional to the available iron core in the motor circuit. As the demand on the motor shaft is greater the motor core increases its level of saturation and the generator will have less and less magnetic material, thus will produce less and less output power. As the horse power and torque demand diminishes on the motor shaft less and less iron gets saturated and magnetized so more and more is available to the generator circuit, thus more and more wattage can be produced.

To construct a device of the invention, we need the base of a standard electric motor for the frame and core part, we also need a stator lamination stack and a rotor lamination stack. The specifics of the inventive device require modification of the stator lamination stack. Unlike standard electric motor the inventive device has 2 sets of windings per phase instead of one, this addition calls for more physical space. To build a stator of the invention comparable in horse power to a standard one, up to 30% more physical space is needed in the stator lamination slots to insert the generator winding circuits. Also up to 30% more lamination stack in length is needed to compensate for the reduction of back iron do to the increased slot depth. Accordingly the rotor lamination stack length has to be increased by the same amount to match the stator lamination stack length.

The stator winding of the inventing device is different from the electric motor existing art, it has two separate sets of windings per phase instead of one, and these windings can vary in ratio from one and other respectively according to the task to be accomplish. The optimum performance is found when both motor and generator circuits are identical in cross sectional wire size, in length and in References of turns. Satisfactory results are also found reducing the cross sectional ^"wire sizes of the generator circuits down to 30% of the motor winding cross sectional wire size; but the length and the References of turns of the generator winding circuits has to remain identical to the motor winding circuit. In building a device of the invention the physical location of the two windings is very important. The generator winding has to be inserted first in the stator slots thus it has to be closer to the back iron of the stator core in order to induct the most current into either the motor winding circuit and into the iron core. It has to be completely physically isolated from the motor winding circuits. In conclusion it has to be in a sandwich situation between the motor winding circuits and the back iron magnetic circuit.

The motor circuit windings have to be inserted after the generator winding circuits in order to be the closest physically possible from the rotor core. The motor winding circuits has to be totally insulated from the generator winding circuits; these to winding circuits, motor and generator are not connected to one and other they only interact by induction but they share the same magnetic core, stator and rotor.

Inserting the motor winding circuits, it has to be physically positioned exactly on top of the equivalent phase and coil groups of the generator winding circuit. Phase A of the motor winding has to be exactly on top of phase A of the generator winding circuit, and as so forth coils of phase B and phase C. The 2 windings motor and generator has to be absolutely identical in coil dimension, References of groups and amount of coil turns, only the cross sectional wire size can be changed but in one direction only. The generator winding cross sectional wire size can be reduced down to, as far as 30% of the motor winding cross sectional wire size; in which case the possible current draw of the respective winding will be reduced accordingly. Connecting the 2 motor and generator winding circuits, the terminals or cable leads has to be precisely and scrupulously marked to have the ability of identifying it outside the motor of the invention. Phase A of the motor winding can only be connected with phase A of the generator winding to function properly, the same has to be respected for phase B and C. Any reverse or cross connections between phases of either winding circuit will result in the immediate destruction of the inventive device. Proper connection is shown in figure 5 and 6.

The winding design of the generator circuit as to be predetermined in a specific way that would allow it to draw at list 25% of the motor winding nominal current; it can draw up the same current as the motor winding circuit but not less than 25% in order for the inventive device to function properly in the way of reducing its current draw and active incoming power. When the inventive device is in operation the generator winding has to supply something in order to produce this minimum of 25% of the motor winding nominal current; this is achieve by either supplying and external demand or by connecting capacitors between the two winding circuits (Motor and generator) ; the size of the capacitor value is determined by the desired current draw (More micro Farads more current, less micro Farads less current draw) . Bringing the generator winding to maximum current in boundary of its cross sectional wire size capabilities will bring the inventive device to maximum reduction of the motor circuit current draw thus reducing all the waste and dramatically increasing motor efficiency. The generator winding produce an active power that is ahead of the incoming grid power. The motor winding circuit utilize the grid power like a standard induction electric motor, thus is lagging the grip incoming power. This lead and lag situation of the two respective winding circuits allows the lager to use the leader available power source. At lower load level on the motor shaft, when the generator winding circuit is using more of the iron core than the motor, the motor circuit will partially feed from the generator. Accordingly, no energy is wasted from the line.

Another phenomenon occurs when all is in action inside the inventive device motor core; it allows the motor side to dramatically reduce its reactive power out back into the power leads at all times. Inside of a standard induction motor, reactive power is created especially at lower load level or inside low speed motor cores, specifically because of the excess of iron or magnetic core not used to convert electrical energy to mechanical energy. Because of the fact that; in the inventive device the normally unused magnetic material is used now to produce electrical energy. There is therefore no excess magnetic material available, thus the inventive device motor circuit cannot produce reactive power at all times. The entire core of the inventive device is constantly solicited by either one of the circuits (thus always fully saturated) not allowing any waste and better yet, the invention device is always producing something, mechanical power or electrical energy.

Producing power with the generator winding circuit has limitations determined by the available magnetic material. Of course at no load demand on the shaft side most of the core that the motor circuit doesn' t require is available at that giving time. Under this particular situation most available electrical energy can be produced. At the maximum shaft load demand on the motor side, the generator circuit can produce the list amount of electrical energy. As long as we stay in the electrical parameters of the generator winding and the maximum watts available by the internal electromagnetic material, taping power from that device does not transfer to excess electrical energy demand on the motor leads . When the motor circuit is energized and no mechanical demand is on the shaft, this is when we can produce the most electrical energy utilizing the rotor momentum energy, the device instead of producing reactive will produce active energy at very little cost and not producing any waste. If we happen to demand more . that the core allows us to produce then the extra demand will show on the motor incoming power leads. The available energy is always a direct product of the available iron core material .

The proposed device result in a inductive electric motor that have very little inrush current demand at startup. Standard induction motors use up to 8 times they nominal current to start, some device available today like electronic soft starts and/or star/delta starters will reduce the inrush current down to 3 to 4 times the nominal current. The inventive device reduces the inrush current down to 1-2 times the nominal current. This is achieved with the inventive device alone; and only some contactors are used, no electronic or any other external devices are used. In order to achieve this the motor and the generator winding circuits are arranged so that the motor winding will start in a half voltage situation by- putting all the motor winding circuits only in series than connecting it back to parallel circuits via contactors and timer, while the generator winding remains simultaneously and at all time at the full voltage in order to produce the most energy at that time and feeding it back to the motor side, powering the inventive device like this results in fraction of the power demand consumed compare to standard electric motors at start.

In one aspect, a device of the invention is capable of converting electrical energy into mechanical horse power just like any motor out there generating only a fraction of the waste that a standard electric motor would do at all load levels. Preferably simultaneously, the device will be capable of producing electrical energy usable respectively. As the device works, and the generator circuit is producing power; this power will find its way to the device motor circuit power leads just because of the lead and lag situation of the two circuits; thus less energy will be required from the power grid to power this device induction electric motor generator .

All benefits found in using the inventive device are: reduced starting current to only 2 times the nominal rated current of the motor and as low as 1 time without the use of any additional electronic external devices . Reduced active power from the power lines to feed the motor because of the interaction of the generator circuit that partially supplies the motor side in a reverse proportional matter to the load demand on the shaft. Reduced electrical demand at all loads still because of the generator circuit interaction. Reduced reactive power at all load demand levels to a, fraction compare to standard motors also because of the interaction of the generator circuit. Increased overall efficiency of the motor at all load levels, because of the interaction of the generator circuit with the motor circuit, more specifically the reverse proportional effect to the motor shaft load; unlike a standard motor, the efficiency percentage does not follow the shaft load. (In a standard motor low loads means low efficiency and high loads means high efficiency; in the inventive device low loads means very high efficiency, high loads high efficiency) . The reason for this is the constant high levels of saturation in the magnetic core do to the generator winding circuit constantly utilizing all magnetic material available. Dramatically reduced no and low load current as low as 2% of the rated nominal current. Reduced rotor rpm slip at all load levels, (Slightly increased shaft speed at all loads) . Reduced electromagnetic sound level even on slow speed electric motors. Reduced electrical vibrations. Reduced installation overall cost, (since the inventive device requires, less inrush current and less full load current, installing the inventive device verse a standard motor requires smaller contactors, thermo protection and fuses, smaller power lines, smaller step down transformers, smaller power plants, smaller power subscriptions, no need to buy any electronic additional equipment to help reduce its running cost) .

Examples and test results: 250kw motor, 1480 rpm, 50Hz, 400 Volts, 467 Amps driving a 40 bar piston air compressor at compressor max load level :

Standard IE2 motor Amps 474 / Inventive device Amps

366 Standard IE2 motor K 273 / Inventive device KW 238 Standard IE2 motor KVAR 154 / Inventive device KVAR

46

Standard IE2 motor KVA 314 / Inventive device KVA 243

Standard IE2 motor PF 0.87 / Inventive device PF

0.98

Compressor at minimum load level :

Standard IE2 motor Amps 139 / Inventive device Amps 76

Standard IE2 motor KW 40 / Inventive device KW 35 Standard IE2 motor KVAR 81 / Inventive device KVAR

6

Standard IE2 motor KVA 92 / Inventive device KVA 40 Standard IE2 motor PF 0.42 / Inventive device PF

0.84

Starting current:

Standard IE2 motor Amps 2400 / Inventive device Amps 823.

7.5KW motor dynamometer test, one standard and one of the inventive devices :

Motor characteristics: 7.5 k , 1465 rpm, 400 Volts,

14.7 Amps, IP 55, 50 Hz, IE2. Test Standard IE2 motor:

Volts 399.4, Amps 14.69, Kw in 8.611, Kw out 7.52, KVA 10.17, KVAR 6.0, RPM 1468.3, EFF % 87.33, PF 0.85, Hz

50.0.

Test inventive device: Volts 402.9, Amps 11.38, Kw in 7.925, Kw out 7.51, KVA 7.94, KVAR 0.0, RPM 1473.1, EFF % 94.76, PF 1.00, Hz 50.0.

This works towards the useful goal of consuming less and producing more, and it can be done with the same device . It will be seen that the advantages set forth above, and those made apparent from the foregoing description, are efficiently attained and since certain changes may be made in the above construction without departing from the scope of the invention, it is intended that all matters contained in the foregoing description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Figure 1 is the representation of a prior art electric motor winding circuit in a delta or parallel configuration, as well as in star or series configuration. It is well know and utilized by anyone with standard skills in induction electric motors, it is also well known that standard induction electric motors have only a motor winding circuit and are never combined with any generator winding circuits internally. References 1, 2 and 3 represent the three successive winding coils and circuits for a three phase motor configured in a delta or parallel configuration. References 4, 5 and 6 represent the three successive parallel connection points to make the delta configuration. References 7, 8 and 9 represent the respective three incoming power lines connecting to the motor terminals. References la, 2a and 3a represent the three winding coils and circuits for a three phase motor configured in a star - or series - configuration. References Xa represents the star connection point. References 4a, 5a and 6a represent the respective three winding end connection points connected to the respective motor terminals. References 7a, 8a and 9a represent the respective three incoming power lines connecting to the respective motor terminals .

In figure 2 reference 10 is the motor outside frame. Reference 12 shows the combination of all motor side winding circuits. Reference 13 shows the combination of all generator side winding circuits. Reference 14 shows the shared only magnetic core. References 17 and 17a show the incoming power lines to the motor winding circuit side. References 18 and 18a show the outgoing power lines of the generator winding circuit side.

Figure 3 shows a prior art solution of how constructing a device that would partially work like the inventive device using what is available today. A device built like so would be a lot less efficient, physically a lot bigger for comparable strength, it will cost a lot more and it will produce a lot more waste because it is the gathering of two separate devices that have to be externally coupled together. Reference 21 is a standard induction electric motor. Reference 22 is a standard induction generator. Reference 23 is a standard contactor that would bring the grid power to the motor. Reference 24 is a contactor that would allow the output power of the induction generator to go from the generator to power demand. Reference 25 is the capacitor unit that would be used to correct the output power of the induction generator. Reference 26 is the mechanical coupling that would allow the induction standard electric motor to drive the generator to its rated speed.

In figure 4, which illustrate a preferred embodiment of a device in conformity with the invention, reference 30 represents the frame of the device. Reference 31 represents the capacitor unit internal that will allow the generator winding circuit to draw the proper amount of current allowing the motor winding circuit to properly function according to the improved above-mentioned specifications. Reference 32 is a standard contactor that will allow the grid power supply to the motor side of the device. Reference 33 represents a standard contactor that will allow the output power from the generator side of said device to reach a power demand being either the immediate motor winding circuit of the inventive device or any external demand.

Figure 5 shows the preferred typical electrical circuit of the presently proposed improved device including the power contactors that will allow the grid power to reach the inventive device. References 40, 41 and 42 represent the respective three motor side winding circuits of the device. Reference 43 represents the capacitor unit used for reaching the proper current draw in the generator side as explained in figure 4. References 44, 45 and 46 represent the generator winding circuits positioned in the same magnetic core of the motor winding circuits. Reference 47 represents the electrical connection from the capacitor unit 43 to the contactor 51 that supplies the power grid to the motor side. Reference 48 represents the electrical connection to a contactor 53 that allows the series connection of the motor winding circuits, creating the half voltage situation for the motor side. Reference 49 represents the electrical connection between part of the motor winding circuit and the power grid that will allow the parallel and full voltage connection to the motor winding circuit side. Reference 50 represents the electrical connection between the motor winding circuits 40,41,42 to the power grid contactor 51. This power contactor 51 allows the power grid to be supplied, via 55, to the motor. Reference 52 represents the contactor that allows the motor winding circuit to be connected in parallel and to receive full voltage. Reference 53 represents the contactor that allows the series connection of the motor winding circuit and to reach the half winding voltage situation. Reference 54 represents an output contactor that allows power out from the generator side towards an outside demand. Reference 55 represents a contactor that is above the inventive device just to supply power to it and protect it. Reference 56 represents the electrical connection between the two contactors 51,52 that allow the half voltage/full voltage situation to the motor winding circuit side 40,41,42. References 57,58,59 represent the output of the generator windings, each one of these three leads will respectively connected to references G1,G2,G3 to reach the capacitor unit 43 for the current control .

Figure 6 is the second preferred typical electrical circuit of the proposed improved device including the power contactors that will allow the grid power to reach the inventive device. References 60,61,62 represent the motor side winding circuits of the invention. References 63,64,65,66,67,68 show the generator winding circuits positioned in the same magnetic core of the motor winding circuits. References 69,70,71 represent the respective three capacitor units connected in a different way as in figure 5, between the internal generator windings. Such an alternative way of connecting the generator winding circuits allows rising the voltage of the generator winding using less micro farads values and increasing the generator current a more economical way. References 72 ,73 ,74 represent the respective secondary generator outputs that allow supplying (electrical) power to an outside demand simultaneously while regulating the current with the capacitor unit; each one of these three leads will respectively be connected to the three references Ga,Gb,Gc for generator output supply to any respective demands. References 75,76,77 represent the output terminals of the generator windings 63,64,65,66,67,68 , each one of these three leads will respectively connected to references G1,G2,G3 to reach the capacitor unit for the current control. Reference 78 represents the electrical connection from the capacitor unit 83 to the contactor that supplies the power grid applied to 87, to the motor side, at reference 79. Reference 79 represents the electrical connection between the motor winding circuits 60,61,62 to the power grid contactor 83. Reference 80 represents the electrical connection between part of the motor winding circuit and the power grid (at 87) that will allow the parallel and full voltage connection to the motor winding circuit side. Reference 81 represents the electrical connection to the contactor 85 that allows the series connection of the motor winding circuits 60,61,62, creating the half voltage situation for the motor side. Reference 82 represents the electrical connection between the two contactors 83,84 that allow the half voltage/full voltage situation to the motor winding circuit side. Reference 83 represents the power contactor that allows the power grid (also called incoming electrical power lines) 87 to be supplied to the motor. Reference 84 represents the contactor that allows the motor winding circuit 60,61,62 to be connected in parallel and to receive full voltage. Reference 85 represents the contactor that allows the series connection of the motor winding circuit and to reach the half winding voltage situation. Reference 86 represents the output contactor that allows power out from the generator side towards an outside power demand. Reference 87 is the contactor which supply power to the above-described device and protect it.

Figure 7 is a cross sectional view of the stator and rotor of the preferred device, perpendicular to the axis 890 of the rotor shaft and rotor core. This shows the specific layout of the respective motor and winding circuits. Reference 89 shows the rotor shaft. Reference 91 represents the rotor core which the rotor shaft is axially coupled to. Reference 93 is the stator core that the motor winding circuit and generator winding circuit share. Reference 95 represents the generator winding circuit. Reference 97 represents the motor winding circuit. Reference 99 represents stator slots.

Figure 8 represents a cross section along the line

VIII-VIII of one stator slot 99 of the series of said slots located around the rotor core 91, as illustrated in figure 7. Reference 101 shows the specific electric insulation material interposed between the motor winding circuit 97 and the generator winding circuit 95. Reference 990 shows the opening of the illustrated slot through which elements 95,97,101 are engaged in said slot.

Figure 9 represents another stator cross section, in a plane parallel to the cross section plane 103 of figure 7. Are shown two successive slots 99 and the respective motor winding and generator winding coils 97,95. References 101 show the respective electrical insulation materials between the two respective motor winding and generator winding. The slots extend (radially to the axis 890; figure 7) in the stator magnetic core 93.

Figure 10 is a simplified diagrammatic representation of the basic construction of the proposed device. Are illustrated the shared magnetic squirrel cage rotor 91 and, therearound, the shared magnetic stator core and poles 93 (having the angularly successive north and south magnetic poles) , the generator winding circuit 95, and the motor winding circuit 97.

Figure 11 shows also the magnetic stator core 93, the motor winding 97, stator slots 99 and the generator winding 95.

Figure 12 represents the main theoretical diagram of the present proposed device constructed as a two poles three phase winding. References 1,2,3 are motor winding terminals. A,B,C represents the three phases of both motor and generator windings 97,95. 11, 22 and 33 represents the generator winding terminals that are respectively connected to G1,G2,G3 shown figure 5 or 6. All the North and South show the respective magnetic poles of both motor and generator windings. It is to be noticed that all A,B,C phases of both motor and generator windings are respectively sequenced in which way they have to be physically laid out on top of (above) each other. It is also to be noticed that all North and South poles of both motor and generator windings 97,95 are respectively sequenced in which way they have to be physically laid out on top of each other. The respective series start configuration and parallel running configuration which follows are further mentioned.

It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which, as a matter of language, might be said to fall therein.

It results from the above description that is concerned an electrical induction device (also called rotative machine) comprising:

- an induction electric motor 21 having a motor winding circuit 97,

an induction electric generator 22 having a generator winding circuit 95,

- a magnetic stator core 93, and,

- a magnetic rotor core 91,

wherein said motor winding circuit and generator winding circuit share the same magnetic material of said magnetic stator core and magnetic rotor core 93,91.

In other words, in the proposed device, the induction electric motor 21 and induction generator 22 are built as a magnetic material single unit, so that it can simultaneously produce a rotating mechanical force on an output shaft 88 and produce an electrical available energy.

The induction electric generator and induction electric motor both share said magnetic rotor core 91 which is single and common thereto.

Concentrically, around the axis 890, from the inside to the outside, are disposed the magnetic rotor core 91 and the magnetic stator core 93 wherein are concentrically disposed the induction electric generator 22 and the induction electric motor 21.

According to a further aspect, the electrical induction device comprises :

- an induction electric motor 21 having a motor winding circuit 97,

an induction electric generator 22 having a generator winding circuit 95, and,

- a magnetic stator core 93, the magnetic stator core comprising a series of successive stator slots 99, each having a bottom and a open top 990, for disposing therein windings, and, within each of the slots of said series :

- a portion of the generator winding circuit 97 is disposed near the bottom,

- and a portion of the motor winding circuit 95 is disposed near the open top.

According to a further aspect, the electrical induction device comprises :

- an induction electric motor 21 having a motor winding circuit 97,

an induction electric generator 22 having a generator winding circuit 95, and,

- a magnetic stator core 93,

- both the induction electric motor and the induction electric generator have a first, a second and a third electric phases (respectively A,B,C),

- the device comprises an axis of rotation 890, and,

- the respective first, second and third electric phases of the motor winding circuit are angularly positioned identical to the respective first, second and third electric phases of the induction electric motor 21, around said axis.

According to a further aspect, the electrical induction device comprises .:

- an induction electric motor 21 having a motor winding circuit 97,

an induction electric generator 22 having a generator winding circuit 95, and,

- a magnetic stator core 93, wherein :

- the device comprises an axis of rotation 890, and,

the respective north and south successive magnetic poles of the motor winding circuit are angularly- positioned identical to the respective north and south successive magnetic poles of the induction electric motor, around said axis 890.

As illustrated essentially figures 7,11 and 12, it is recommended that the device comprise a series of north and south successive magnetic poles wherein at the location of a determined magnetic pole of said series of north and south magnetic poles, both the motor winding circuit 97 and the generator winding circuit be wound together around said determined magnetic pole.

As illustrated essentially figures 7-9, it is also recommended that the magnetic stator core 93 comprise a series of successive stator slots 99, and, at the location of a determined slot of said series of successive stator slots, both the motor winding circuit 97 and the generator winding circuit 95 be wound together and electrically insulated from one another, for producing an electrical transformer effect therebetween.

As illustrated essentially figures 7,9, it is further recommended that the device comprise a series of successive north and south magnetic poles, each defined by a part of the magnetic stator core extending between at least two stator slots of a series of successive stator slots 99 made in the magnetic stator core 93, wherein, at the location of a determined slot of said series of successive stator slots, both the motor winding circuit 97 and the generator winding circuit 95 are wound together around said part of the magnetic stator core and electrically insulated from one another (insulation element 101) , for producing an electrical transformer effect therebetween.

Claims

1. An electrical induction device comprising:

- an induction electric motor having a motor winding circuit,

an induction electric generator having a generator winding circuit,

- a magnetic stator core, and,

- a magnetic rotor core,

wherein said motor winding circuit and generator winding circuit share the same magnetic material of said magnetic stator core and magnetic rotor core.

2. An electrical induction device comprising:

- an induction electric motor having a motor winding circuit,

an induction electric generator having a generator winding circuit,

- a magnetic rotor core,

wherein the induction electric generator and induction electric motor both share said magnetic rotor core which is single and common thereto.

3. An electrical induction rotative device comprising concentrically, from the inside to the outside, a magnetic rotor core and a magnetic stator core within which are concentrically disposed from the inside to the outside an induction electric generator and an induction electric motor.

4. An electrical induction rotative device comprising : an induction electric motor having a motor winding circuit,

an induction electric generator having a generator winding circuit, and,

- a magnetic stator core,

- a portion of the generator winding circuit is disposed near the bottom,

- and a portion of the motor winding circuit is disposed near the open top.

5. An electrical induction rotative device comprising :

an induction electric motor having a motor winding circuit,

an induction electric generator having a generator winding circuit, and,

- a magnetic stator core,

wherein :

both the induction electric motor and the induction electric generator have a first, a second and a third electric phases,

- the device comprises an axis of rotation, and,

- the respective first, second and third electric phases of the motor winding circuit are angularly positioned identical to the respective first, second and third electric phases of the induction electric motor, around said axis .

6. An electrical induction rotative device comprising:

an induction electric motor having a motor winding circuit,

an induction electric generator having a generator winding circuit, and,

- a magnetic stator core, wherein :

- the device comprises an axis of rotation, and, the respective north and south successive magnetic poles of the motor winding circuit are angularly- positioned identical to the respective north and south successive magnetic poles of the induction electric motor, around said axis.

7. The device of anyone of the preceding claims, wherein both the induction electric motor and the induction electric generator have three electric phases.

8. The device of anyone of the preceding claims, wherein the induction electric generator and induction electric motor both share said magnetic rotor core which is single and common thereto.

9. The device anyone of claims 1,2 and 4 to 8 , wherein it comprises, concentrically, from the inside to the outside, the magnetic rotor core and the magnetic stator core wherein are concentrically disposed the induction electric generator and the induction electric motor .

10. The device of anyone of claims 1 to 5 and 7 to

9 , comprising a series of north and south successive magnetic poles wherein at the location of a determined magnetic pole of said series of north and south magnetic poles, both the motor winding circuit and the generator winding circuit are wound together around said determined magnetic pole.

11. The device of anyone of claims 1 to 3 , and 5 to

10, wherein the magnetic stator core comprises a series of successive stator slots, and, at the location of a determined slot of said series of successive stator slots, both the motor winding circuit and the generator winding circuit are wound together and electrically insulated from one another, for producing an electrical transformer effect therebetween.

12. The device of anyone of claims 1 to 5 and 7 to 9 , comprising a series of successive north and south magnetic poles, each defined by a part of the magnetic stator core extending between at least two stator slots of a series of successive stator slots made in said magnetic stator core, wherein, at the location of a determined slot of said series of successive stator slots, both the motor winding circuit and the generator winding circuit are wound together around said part of the magnetic stator core and electrically insulated from one another, for producing an electrical transformer effect therebetween.

13. The device of anyone of the preceding claims, wherein the motor winding circuit has first terminals connected to incoming electrical power lines, and the generator winding circuit has second terminals connected to said incoming electrical power lines through at least one capacitor.

14. The device of anyone of claims 1 to 12, wherein the generator winding circuit has terminals connected to incoming electrical power lines through at least one capacitor having a predetermined value adapted as a function of an electrical current to be produced by the generator winding circuit.

15. The device of anyone of claims 1 to 12, wherein:

- the generator winding circuit includes at least one capacitor interposed between a first terminal of two portions of the generator winding circuit, and,

- a second terminal of each of said two portions is electrically connected to one of incoming electrical power lines and terminals of the motor winding circuit.

16. The device of anyone of the preceding claims, wherein, during a starting sequence of the device :

- at a first step, the motor winding circuit is starting in a series configuration for a predetermined period of time and simultaneously, the generator winding circuit is in a parallel configuration and produces a maximum electrical current, and,

- at a second step, the motor winding circuit goes to a parallel configuration, while the generator winding circuit remains in the parallel configuration, so that the starting electrical inrush current of the motor winding circuit is less two times the nominal electrical current of the motor winding rated circuit.

17. The device of claim 7, or claim 7 and anyone of the following claims, wherein, during a starting sequence of the device :

- at a first step, the phases of the motor winding circuit only are connected in a series configuration, through contactors, and then,

- at a second step, the phases of the motor winding circuit only are connected in a parallel configuration,, through said contactors.