JP3115310B2 - 2 stator induction synchronous motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to an induction synchronous motor having a large starting torque that does not require a starter.

[Prior art]

In general, a synchronous motor requires a starter that accelerates the rotor to near the rotational speed of the rotating magnetic field generated by the stator winding, that is, near the synchronous speed, and DC excitation of the rotor winding. Induction synchronous motors have been devised to omit this starter and give the synchronous motor itself a start-up torque.This is because the starter is short-circuited at start-up to start the induction motor as an induction motor. Although not required, a brush is required for DC excitation of the rotor windings required for synchronous operation. That is, when the rotation speed of the rotor approaches the synchronous speed, the short circuit of the rotor winding is opened, and a DC current is supplied from an external DC power supply to the rotor winding via a brush to create a magnetic pole in the rotor. The magnetic poles are pulled by the rotating magnetic field created by the stator winding, and the rotor rotates at a synchronous speed. Since this brush requires maintenance and inspection, maintenance costs are increased, and development of a brushless synchronous motor is desired. As the synchronous motor having the brushless structure, there are a permanent magnet type and a reluctance type conventionally. However, since the starting torque of the induction motor is small because the induction motor cannot be started, it is limited to a small capacity motor. In addition, the synchronous motor of the Landel type or the inductor type has a drawback that the configuration of the magnetic path is complicated and large. The same applies to a method using an AC exciter and a rotary rectifier. In addition, a brushless self-excited three-phase synchronous motor that uses a harmonic magnetic field generated by the square wave voltage of an inverter by connecting a diode to the rotor winding has the disadvantage that sufficient output cannot be obtained due to insufficient field magnetomotive force of the rotor. There is. Furthermore, a diode is inserted in one phase of the three-phase stator winding, and a static magnetic field is superimposed on the positive-phase rotating magnetic field generated by the stator, and the AC voltage due to the static magnetic field is applied to the rotor winding rotating at the synchronous speed. To induce
There is a brushless self-excited three-phase synchronous motor that rectifies this with a diode, excites the rotor windings with direct current, and applies a positive-phase rotating magnetic field to generate synchronous torque.
This is because it is impossible to start the induction machine, so that the rotor is started by the eddy current of the rotor core and the starting torque is small. In Japanese Patent Publication No. 54-34124, starting is performed by the principle of an induction machine, and synchronous operation is performed by creating a DC magnetic field in the axial direction and thereby forming a magnetic pole on a rotor core. There is a disadvantage that the shaft is oscillated because it is asymmetric with respect to the rotating shaft. As described above, even when self-starting is possible, since the starting torque is small, another starting machine is always required especially for starting the inertial load.

[Problems to be solved by the invention]

Therefore, a technical problem is to provide a synchronous motor that has a large starting torque, a large synchronous torque, does not require a brush, is easy to maintain, has a simple structure, and can cope with an inertial load that does not require a dedicated starter. It is assumed that.

[Means for Solving the Problems]

A first rotor winding and a second rotor winding are wound around each of two rotor cores provided at an arbitrary interval on the same rotating shaft, and the first rotor winding is wound. The two rotor cores are connected in series with each other, a connecting resistor is connected between the connection points, and each of the two rotor cores faces each other with the rotor cross-connected between the second rotor windings. And the first and second
And two stators each having a stator winding so as to be magnetically coupled with the rotor winding of the rotor, and a specific one of the two stators facing one of the rotors. Between the rotating magnetic field generated around the rotor core and the rotating magnetic field generated around the other rotor core facing the other stator.
And a voltage phase shifter for selectively generating one of the two phase differences of ゜ and 180 °. The voltage phase shifter is provided on the rotating shaft, and its DC output is supplied to the second rotor winding. A rotating armature type alternator for generating a magnetic pole in the rotor by supplying the rotor in parallel between the crossover points, and selecting a phase difference of 180 ° by the voltage phase shifter at the time of startup, It starts as an induction motor by an electromagnetic action between the first and second rotor windings and the rotating magnetic field generated by the two stators, and the voltage phase shifter is used when synchronizing is performed. By selecting the phase difference 0 ° at the same time and operating the rotating armature type alternator at the same time,
Means for solving the above problem by operating as a synchronous motor by an electromagnetic action between a rotating magnetic field generated by a plurality of stators and a magnetic pole generated in the rotor by a direct current flowing through the second rotor winding. And Further, according to the present invention, a plurality of conductors communicating with the two rotor cores are provided on the outer periphery of two rotor cores provided at an arbitrary interval on the same rotating shaft, and both ends thereof are short-circuited. And a cage-shaped conductor in which the plurality of conductors are short-circuited by a connection resistor at a central portion between the two rotor cores, and a rotor winding wound around each of the two rotor cores. A rotor having wires and cross-connecting the rotor windings, and a magnetic coupling between the cage-shaped conductor and the rotor windings, which are circumferentially opposed to each of the two rotor cores. Two stators each provided with a stator winding, and a rotating magnetic field generated around one rotor core in which a specific one of the two stators is opposed to the two stators; 0 ° between the other stator and the rotating magnetic field generated around the other rotor core opposed thereto. A voltage phase shifting device produce selectively one of a phase difference any one of the 180 ° two phase differences,
A rotating armature type alternator, which is provided on the rotating shaft and supplies the DC output thereof in parallel between the intersections of the rotor windings to generate magnetic poles in the rotor, Selects a phase difference of 180 ° by the voltage phase shifter, thereby starting up as an induction motor due to the electromagnetic action between the cage conductor and the rotor winding and the rotating magnetic field generated by the two stators. At the time of synchronizing, the phase difference of 0 ° is selected by the voltage phase shifter and the rotating armature type alternator is operated at the same time.
The means for solving the above-mentioned problem is achieved by operating as a synchronous motor by an electromagnetic action between a rotating magnetic field generated by a plurality of stators and a magnetic pole generated in the rotor by a direct current flowing through the rotor winding.

[Operation]

On the stator side, there are two sets of stator windings, and on the rotor side, the first two sets of rotor windings are connected in series and a connection resistor is connected in parallel between the connection points; The second two sets of rotor windings are cross-connected to each other, and the output of the rotary armature AC generator directly connected to the rotary shaft is rectified by a rectifier circuit. The operation in the case of inputting in parallel between the cross connection points of the child windings will be described. First, at the time of startup, the voltage phase shifter is operated such that the phase difference angle θ of the induced voltage due to the rotating magnetic field in each of the first rotor winding and the second rotor winding becomes θ = 180 °. And turn on the power to the stator to start. In this case, two different rotating magnetic fields having a phase difference of 180 ° are generated between the two stators, and voltages corresponding to the respective rotating magnetic fields are induced in the rotor windings. The phase difference angle θ of the induced voltage between the rotor windings is θ = 180 °, so that the currents flowing by the voltages induced in the respective rotor windings of the first rotor winding are opposite to each other. Since it becomes a current, it flows through a contact resistor provided in parallel with the rotor winding. Further, the currents flowing by the voltages induced in the respective second rotor windings become currents in the same direction because the windings are cross-connected, and flow so as to circulate between the two windings. The current flowing through the first rotor winding and the second rotor winding and the torque caused by the rotating magnetic field generated by the stator winding are the first torque.
The torque characteristics of the conventional secondary high resistance type induction motor having a large torque at slip S = 1 due to the rotor winding and the conventional torque increasing torque in the region where the slip S is small due to the second rotor winding. This is a combination of the torque characteristics of the secondary low resistance induction motor. After start-up, when the rotation speed increases and the slip S approaches S = 0.05, the operation is drawn into the synchronous operation. This is performed as follows. First, the phase difference angle θ between the two rotating magnetic fields created by the two stator windings is set to θ = 0 ° by the voltage phase shifter. In this way, the phase difference angle θ of the induced voltages of the first rotor winding and the second rotor winding becomes θ = 0 °, and the respective rotor windings of the first rotor winding The flowing current flows in the same direction so as to circulate through both windings, and no current flows through the connection resistance, so that the same torque as that of the secondary low-resistance induction motor is generated. Therefore, the synchronous pull-in torque at S = 0.05 is large. Also, the current flowing through the second rotor winding is reversed because the windings are cross-connected, so that the circulating current stops flowing and the current flows through the rectifier circuit connected in parallel. However,
Since this current flowing through the rectifier circuit is extremely small,
It does not affect the synchronous pull-in torque by the first rotor winding. Here, the synchronous torque is generated as follows. That is, when the rotating armature AC generator directly connected to the rotating shaft is operated, its output is rectified by the rectifier circuit, and its DC output is input in parallel between the cross connection points of the second rotor windings. Therefore, DC current flows through the second rotor winding to form a magnetic pole on the rotor core. The magnetic poles are formed at the same position around the rotor core and at the same polarity. On the other hand, since the phase difference angle θ between the two rotating magnetic fields is θ = 0 °, the magnetic poles around the stator facing the rotor core formed by the two rotating magnetic fields are formed at the same position and with the same polarity. Is done. Therefore, the rotor is locked by the rotating magnetic field and generates a synchronous torque, and the rotor rotates at a synchronous speed. When synchronized, the first and second rotor windings rotate at the same speed as the rotating magnetic field, so that they do not interlink with the rotating magnetic field. Since no base voltage is induced and therefore no current flows, there is no effect on the synchronous operation due to the action between the rotating magnetic field and the DC magnetization by the rotating armature alternator. This synchronous torque is twice the torque of a synchronous motor composed of one stator and one rotor. That is, although the two-stator induction synchronous motor of the present invention is a two-stator, all of these two stators work effectively. Next, two rotor cores are provided in opposition to the two stators, and a plurality of rotor conductors mounted on the outer periphery of the two rotor cores are connected to each other in a communicating manner to connect both ends thereof. Providing a short-circuiting ring for short-circuiting the conductors in the portion, forming the rotor conductors in a cage shape, and short-circuiting the plurality of rotor conductors with a communication resistor at a central portion between the two rotor cores, Further, a rotor winding is wound around each of the two rotor cores, the rotor windings are cross-connected to each other, and a rotating armature type AC generator is directly connected to the rotating shaft to rectify the output. The operation when the rectification is performed by a circuit and the DC output of the rectification circuit is input in parallel from the cross connection point of the rotor windings will be described. First, at start-up, the voltage phase shifter is operated so that the phase difference angle θ between the induced voltages of the rotor conductor and the rotor winding due to the two rotating magnetic fields becomes θ = 180 °. Turn on the power and start up. In this way, two rotating magnetic fields having a phase difference of 180 ° are generated between the two stator windings, and a voltage is induced in the rotor conductor and the rotor winding. In this case, the phase difference angle of the induced voltage is generated. Since θ is θ = 180 °, the current flowing through the cage-shaped rotor conductor flows in the opposite direction between the rotor cores, and flows through the contact resistance. Since they are cross-connected, they flow in the same direction as each other so as to circulate through both windings. The current flowing through the rotor conductor and the rotor windings and the torque due to the rotating magnetic field generated by the stator windings are the same as those of the conventional secondary high-resistance induction motor having a large torque at S = 1 due to the cage rotor conductor. This is a combination of the torque characteristic and the torque characteristic of the conventional secondary low-resistance induction motor in which the torque increases in a region where the slip S is small due to the rotor winding. Therefore, the starting current is small and the starting torque is large, and no special separate starter is required. After start-up, when the rotation speed increases and the slip S approaches S = 0.05, the operation is drawn into the synchronous operation. This is performed as follows. First, two stator windings are formed by a voltage phase shifter.
The phase difference angle θ between the two rotating magnetic fields is set to θ = 0 °. In this case, the phase difference angle θ of the induced voltages of the rotor conductor and the rotor winding becomes θ = 0 °, and the current in the same direction is applied to the cage rotor conductors of the two rotor cores. As a result, the current flows in such a way as to circulate through both conductors, and no current flows through the connection resistance. Further, since the rotor windings are cross-connected, a circulating current does not flow contrary to the cage rotor conductor, and a current flows through a rectifier circuit connected in parallel. Here, the synchronous torque is generated as follows. In other words, when the rotating armature type alternator directly connected to the rotating shaft is operated, its output is rectified by the rectifier circuit, and its DC output is input in parallel from the intersection of the rotor windings. DC current flows through the windings to form magnetic poles on the rotor core. The magnetic poles are formed with the same polarity at the same position around the rotor core with the N and S poles being paired. On the other hand, since the phase difference angle θ of the rotating magnetic field between the two stators is θ = 0 °, the magnetic poles around the stator facing the rotor core formed by the two rotating magnetic fields are the same at the same position. It is formed in the polarity of. Therefore, the rotor is locked by the rotating magnetic field and generates a synchronous torque, and the rotor rotates at a synchronous speed.
This synchronous torque is twice the torque of a synchronous motor composed of one stator and one rotor. When synchronized, no voltage is induced in the squirrel-cage rotor conductor, no current flows, and there is no problem in synchronous operation.

【Example】

A first embodiment of the present invention will be described with reference to FIG. First, in FIG. 1, reference numeral 20 denotes a stator side of a two-stator induction synchronous motor. Reference numeral 30 also indicates the rotor side. On the stator side 20, two star-connected stator windings 21, 22 are connected in parallel to three-phase AC power supplies R, S, T. On the other hand, two rotor cores 81 and 82 are attached to the rotation shaft 10 on the rotor side 30.
Are provided on the rotor cores 81 and 82, respectively.
, And the second rotor windings 33, 34 are wound. The first rotor windings 31 and 32 are connected in series with each other and connected with a connecting resistor 35 in parallel.
The second rotor windings 33 and 34 are cross-connected to each other, and the output of the armature 70 of the known rotary armature AC generator directly connected to the rotary shaft 10 is rectified by the rectifier circuit 36. The obtained DC output is input to the second rotor windings 33 and 34 in parallel. Here the voltage induced to the first rotor winding 31 wound around the rotor core 81 facing the stator windings 21 and E ₁ in the direction of the illustrated Figure 1, also the second rotor it of winding 33 E ₂
And Further, the voltage induced in the first rotor winding 32 wound around the rotor core 82 facing the stator winding 22 is set to E ₁ ε ^{jθ in} the direction shown in FIG. Child winding 34
^Let it be E ₂ ε ^jθ . Here, θ is the phase difference angle of the voltage. The operation of the above configuration will be described. First, at the time of starting, the first rotor windings 31, 32 and the second rotor windings 33, 34
The phase difference angle θ of the voltage induced by the rotating magnetic field is θ =
When the stator windings 21 and 22 are connected so as to be 180 °, the power is turned on and the system is started. In this way, stator winding 2
A three-phase current flows from the power supply to the first and the second 22 to generate two rotating magnetic fields having phases different from each other by 180 °, and voltages are induced in the first rotor windings 31 and 32 and the second rotor windings 33 and 34. However, the phase difference angle θ of the induced voltage in this case is 180 °,
The current flowing through the rotor windings 31 and 32 has voltages of E ₁ and E ₁ ε
^{J180 °} next vector is reverse flow both through contact resistance 35, also the current flowing through the second rotor winding 33 and 34 and the voltage so are cross connection is in the E ₂ and E ₂ epsilon ^{J180 °} Flows so as to recirculate through both windings. The first rotor windings 31, 32 and the second rotor windings 33,
The torque caused by the current flowing through the motor 34 and the rotating magnetic field generated by the stator windings 21 and 22 is, as shown by the curve (a) shown in FIG. And the torque characteristics of a conventional secondary low-resistance induction motor in which the torque increases in a region where the slip S is small. Therefore, the starting current is small and the starting torque is large, and no special starting device is required. After start-up, when the rotation speed increases and the slip S approaches S = 0.05, the operation is drawn into the synchronous operation. This is performed as follows. First, the position of one of the two stator windings 21, 22, for example, the stator winding 22, is changed by rotating it around a rotation axis by a voltage phase shifter to change the two stator windings 21, 2.
The phase difference angle θ between the two rotating magnetic fields created by 2 is set to θ = 0 °. By doing so, the first rotor windings 31, 3
The phase difference angle θ of the induced voltages of the second and second rotor windings 33 and 34 becomes θ = 0 °, and the current flowing through the first rotor windings 31 and 32 has the voltages E ₁ and E ₁ ε. It becomes ^jθ and flows so as to ^circulate through both windings, and no current flows through the connection resistor 35. The current flowing through the second rotor windings 33 and 34 has a voltage of E ₂
Although it becomes E ₂ ε ^jθ , no ^circulating current flows because it is cross-connected. Therefore, as shown by the curve (b) in FIG. 2, the same torque as that of the conventional induction motor is generated, so that S = 0.
The synchronous pull-in torque at 05 is large. Here, the synchronous torque is generated as follows. That is, when the armature 70 of the rotating armature type AC generator directly connected to the rotating shaft 10 is operated, its output is rectified by the rectifier circuit 36, and its DC output is paralleled to the second rotor windings 33, 34. , A DC current flows through the second rotor windings 33, 34 to form magnetic poles on the rotor cores 81, 82. The magnetic poles are formed at the same position around the rotor cores 81 and 82 with the same polarity, with the N and S poles being paired. On the other hand, since the phase difference angle θ between the two rotating magnetic fields is θ = 0 °, the magnetic poles around the stator facing the rotor cores 81 and 82 formed by the two rotating magnetic fields are the same at the same position. It is formed to be polar. Therefore, the rotor is locked by the rotating magnetic field and generates a synchronous torque, and the rotor rotates at a synchronous speed. This synchronous torque is as shown by the straight line (c) in FIG. 2, and is twice as large as that of the synchronous motor composed of one stator and one rotor. That is, although the two-stator induction synchronous motor of the present invention is a two-stator, all of these two stators work effectively. Next, a second embodiment of the present invention will be described with reference to FIGS. First, in FIG. 3, reference numeral 20 indicates the stator side of a two-stator induction synchronous motor. Reference numeral 40 also indicates the rotor side. On the stator side 20, two star-connected stator windings 21, 22 are connected in parallel to three-phase AC power supplies R, S, T. On the other hand, two rotor cores 83 and 84 are attached to the rotating shaft 10 on the rotor side 40.
And a short-circuit ring 45 for connecting the plurality of rotor conductors 41 and 42 mounted on the outer periphery of the two rotor cores 83 and 84 in a communicating manner and short-circuiting the conductors at both ends thereof.
And the rotor conductors are formed in a cage shape, and the plurality of rotor conductors are short-circuited at the central portion between the two rotor cores 83 and 84 by the communication resistor 35. And the fourth
As shown in the figure, rotor windings 43 and 44 are wound around two rotor cores 83 and 84, respectively, and the rotor windings 43 and 44 are cross-connected. Further, an armature 70 of a known rotating armature type AC generator is provided directly connected to the rotating shaft 10, and its output is rectified by the rectifier circuit 36 and the DC output of the rectifier circuit 36 is supplied to the rotor windings 43 and 44. Are input in parallel via the cross connection points. Here the voltage induced in the rotor conductors 41 facing the stator windings 21 and E ₁ in the direction of the illustrated Figure 3, similarly to that of the rotor winding 43 and E _2. The voltage induced in the rotor conductor 42 facing the stator winding 22 is E ₁ ε ^jθ in the illustrated direction, and the voltage of the rotor winding 44 is E ₂ ε ^jθ . Here, θ is the phase difference angle of the voltage. The operation of the above configuration will be described. First, at the time of startup, the stator windings 21 and 22 are connected such that the phase difference angle θ of the induced voltage due to the rotating magnetic field of the rotor conductors 41 and 42 and the rotor windings 43 and 44 becomes θ = 180 °. Turn on the power and start up. In this way, a three-phase current flows from the power supply to the stator windings 21 and 22 to generate two rotating magnetic fields having a phase difference of 180 °, and voltage is applied to the rotor conductors 41 and 42 and the rotor windings 43 and 44. Is induced, and the phase difference angle θ of the induced voltage in this case is θ
Since 180 = 180 °, the currents flowing through the rotor conductors 41 and 42 both flow through the communication resistor 35, and the currents flowing through the rotor windings 43 and 44 flow so as to circulate through both windings. The currents flowing through the rotor conductors 41 and 42 and the rotor windings 43 and 44 and the torque due to the rotating magnetic field generated by the stator windings 21 and 22 are represented by a curve S = Slip as shown by a curve (a) in FIG. 1, the torque characteristics of the conventional secondary high resistance type induction motor having a large torque;
This is a combination of the torque characteristics of a conventional secondary low-resistance induction motor in which the torque increases in a region where the slip S is small. Therefore, the starting current is small and the starting torque is large,
No special separate starter is required. After start-up, when the rotation speed increases and the slip S approaches S = 0.05, the operation is drawn into the synchronous operation. This is performed as follows. First, the position of one of the two stator windings 21, 22, for example, the stator winding 22, is changed by rotating it around a rotation axis by a voltage phase shifter to change the two stator windings 21, 22.
Is set so that the phase difference angle θ between the two rotating magnetic fields formed by θ becomes θ = 0 °. In this way, the phase difference angle θ of the induced voltages of the rotor conductors 41 and 42 and the rotor windings 43 and 44 becomes θ = 0 °, and the current flowing through the rotor conductors 41 and 42 recirculates through both conductors. And the current stops flowing through the connection resistor 35. Also, no circulating current flows through the rotor windings 43 and 44. Therefore, the same torque as that of the conventional induction motor is generated as shown by a curve (b) in FIG. Therefore, the synchronous pull-in torque at S = 0.05 is large. Here, the synchronous torque is generated as follows. That is, when the armature 70 of the rotary armature type AC generator directly connected to the rotating shaft 10 is operated, its output is rectified by the rectifier circuit 36, and its DC output is input to the rotor windings 43 and 44 in parallel. Therefore, DC current flows through the rotor windings 43 and 44 to form magnetic poles on the rotor cores 83 and 84. The magnetic poles are formed with the same polarity at the same position around the rotor cores 83 and 84 with the N and S poles being paired. On the other hand, since the phase difference angle θ between the two rotating magnetic fields is θ = 0 °, the magnetic poles around the stator facing the rotor cores 83 and 84 formed by the two rotating magnetic fields are the same at the same position. It is formed to be polar. Therefore, the rotor is locked by the rotating magnetic field and generates a synchronous torque, and the rotor rotates at a synchronous speed. This synchronous torque is as shown by the straight line (c) in FIG. 2 and is twice as large as that of the synchronous motor composed of one stator and one rotor. That is, although the two-stator induction synchronous motor of the present invention is a two-stator, all the two stators work effectively.

[Effect]

From the above configuration, the two-stator induction synchronous motor of the present invention
In particular, the inertia load is started with the same torque characteristics as those of the conventional secondary high-resistance type induction motor, and the slip S shifts from, for example, around S = 0.05 to the synchronous speed, and the motor is operated with the synchronous motor's torque characteristics. Things. In addition, when the synchronous torque is introduced, the torque characteristic is the same as that of the secondary low resistance type induction motor, so that the synchronous intake torque is large. This two-stator induction synchronous motor does not require a starter or a brush, so that its structure and configuration are simplified, and since it can be started with the same torque characteristics as a conventional secondary high-resistance type induction motor, it is heavy. Start-up and synchronous operation are possible with a load applied. By the way, the two-stator induction synchronous motor of the present invention has both the torque characteristics of the induction motor and the synchronous motor, and therefore can be used with the torque characteristics of either motor. This means that even if the motor loses synchronism for some reason during operation at the synchronous speed, the torque characteristic of the induction motor can be switched from the torque characteristic of the induction motor to the torque characteristic of the induction motor. There is no. As described above, since there is no brush and no complicated structure is required, maintenance and inspection are easy, and a synchronous motor having a large starting torque and a large synchronous torque can be provided.

[Brief description of the drawings]

FIG. 1 is a simplified configuration diagram of a stator winding side and a rotor side of the present invention, FIG. 2 is a diagram showing an example of a torque characteristic of a two-stator induction synchronous motor according to the present invention, and FIG. FIG. 4 is a view showing a part of the stator winding side and a part of the rotor side according to the invention, and FIG. 4 is a view showing a part of the rotor side in FIG. 10 ... rotating shaft, 20 ... stator side, 21 ... stator winding, 22
... stator winding, 30 ... rotor side, 31 ... rotor winding, 3
2 ... rotor winding, 33 ... rotor winding, 34 ... rotor winding, 35 ... contact resistance, 36 ... rectifier circuit, 40 ... rotor side, 41 ... rotor conductor, 42 ... rotor conductor, 43 ... rotor winding, 44 ... rotor winding, 45 ... short-circuit ring, 70 ... armature of rotating armature type AC generator, 81 ... rotor core, 82…
... rotor core, 83 ... rotor core, 84 ... rotor core.

Claims (2)

(57) [Claims] 1. A first rotor winding and a second rotor winding are wound around two rotor cores provided at an arbitrary interval on the same rotating shaft, respectively. A rotor in which the first rotor windings are connected in series, a connection resistor is connected between the connection points, and the second rotor windings are cross-connected;
Two stators which are provided around the two rotor cores and are provided with stator windings so as to be magnetically coupled with the first and second rotor windings, respectively; One of the two stators has a rotating magnetic field generated around one of the rotor cores facing it, and the other stator has a rotating magnetic field generated around the other rotor core facing it. A voltage phase shifter for selectively generating any one of two phase differences of 0 ° and 180 ° between the rotating magnetic field, and a voltage phase shifter provided on the rotating shaft and directing its DC output to the A rotating armature type AC generator for generating magnetic poles in the rotor by supplying the rotor in parallel between the cross-connecting points of the two rotor windings. By selecting the first rotor winding and the second rotor winding.
The motor starts as an induction motor due to the electromagnetic action between the rotor windings and the rotating magnetic fields generated by the two stators. At the time of pull-in, when the phase difference of 0 ° is selected by the voltage phase shifter, the rotation is simultaneously performed. By operating the armature type alternator, the rotating magnetic field generated by the two stators and the second
A two-stator induction synchronous motor, which operates as a synchronous motor by an electromagnetic action between the rotor and a magnetic pole generated by the direct current flowing through the rotor winding. 2. A plurality of conductors connected to two rotor cores are provided on the outer periphery of two rotor cores provided at an arbitrary interval on the same rotation axis, and both ends thereof are short-circuited. A squirrel-cage conductor which is connected and short-circuited between the plurality of conductors at a central portion between the two rotor cores by a communication resistor;
A rotor winding wound around each of the two rotor cores, and a rotor having the rotor windings cross-connected to each other, and a rotor wound around each of the two rotor cores. Two stators each having a stator winding provided so as to magnetically couple with the cage conductor and the rotor winding, and a specific one of the two stators facing the stator. Between the rotating magnetic field generated around one rotor core and the rotating magnetic field generated around the other rotor core opposed by the other stator. A voltage phase shifter for selectively generating any one of the phase differences, and a DC phase shifter provided on the rotating shaft, the DC output of which is supplied in parallel between the cross-connection points of the rotor windings. And a rotating armature type AC generator for generating magnetic poles, and at the time of startup, the voltage phase shifter By selecting a phase difference of 180 °, the cage-shaped conductor and the rotor winding start up as an induction motor due to the electromagnetic action between the rotor windings and the rotating magnetic fields generated by the two stators. By selecting the phase difference 0 ° by the voltage phase shifter and operating the rotating armature type AC generator at the same time, the rotating magnetic field generated by the two stators and the DC flowing through the rotor windings cause A two-stator induction synchronous motor, which operates as a synchronous motor by electromagnetic action between a magnetic pole generated in a rotor and the rotor.