CN113285651A - Device and method for converting multi-phase power supply into single-phase power supply - Google Patents
Device and method for converting multi-phase power supply into single-phase power supply Download PDFInfo
- Publication number
- CN113285651A CN113285651A CN202110571183.2A CN202110571183A CN113285651A CN 113285651 A CN113285651 A CN 113285651A CN 202110571183 A CN202110571183 A CN 202110571183A CN 113285651 A CN113285651 A CN 113285651A
- Authority
- CN
- China
- Prior art keywords
- phase
- winding
- magnetic field
- rotating magnetic
- stator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
Abstract
The invention relates to a device and a method for converting a multi-phase power supply into a single-phase power supply, which comprises an input winding and a single-phase voltage output winding; the input winding is arranged on a stator of the multi-phase alternating current motor; the input winding is at least a three-phase winding; the number of phases of the input winding is the same as that of the multi-phase power supply; the single-phase voltage output winding comprises a stator output winding arranged on the stator and a rotor output winding arranged on the rotor; and the stator output winding is used for generating a synthesized rotating magnetic field when the input winding is connected with the multi-phase power supply, and providing the single-phase power supply for the load under the action of the synthesized rotating magnetic field. Therefore, in the invention, only by arranging the input winding, the stator output winding and the rotor output winding on the alternating current motor, the stator output winding generates single-phase voltage by utilizing the synthetic magnetic field generated by the three windings, the multiphase power supply is converted into the single-phase power supply, and the reliability is high.
Description
Technical Field
The invention relates to the technical field of phase-number conversion of a power supply in electromagnetic equipment, in particular to a device and a method for converting a multi-phase power supply into a single-phase power supply.
Background
The power supply system of modern power systems is mainly based on a three-phase system, and the most available power system of users is a three-phase power supply or a single-phase power supply which is one phase of the three-phase power supply. Therefore, the electric equipment in industry mainly uses three-phase or single-phase electric equipment, for example, in the field of alternating current electric transmission such as industrial and agricultural production, the most widely used driving motor mainly uses a three-phase motor, while the household appliances mainly use a single-phase power supply because the electricity consumption of residents is mainly single-phase power supply, and the power supply lines provided by power supply enterprises for residents mostly only provide single-phase power supply, and the used household appliances mainly supply power by single-phase power supply.
The asymmetry problem of three-phase loads is generally balanced by approximately equal power utilization probabilities of the loads by taking one phase of a three-phase utility power system as a single-phase power source. However, it is difficult to ensure complete symmetry of the three-phase load by this method, and even a severe negative sequence component is caused in the three-phase utility power system, which affects the safe operation of the system and generates a large negative sequence loss in the electric equipment. In addition, the conventional power electronics technology for converting the phase number requires complicated rectification and inversion processes, and a filter device for reducing the influence of harmonic waves. The basic principle of the technology is that harmonic waves are easily introduced into a system by performing area equivalent cutting combination on current or voltage, and meanwhile, the technology is based on power electronic devices, and the stability and overload capacity of the technology are limited. Therefore, the existing technology for converting the multi-phase power supply into the single-phase power supply output has certain defects, and the power supply reliability is low. In view of the above problems, the present invention provides an apparatus and method for converting a multi-phase power to a single-phase power.
Disclosure of Invention
The invention aims to provide a device and a method for converting a multiphase power supply into a single-phase power supply, wherein the device and the method are used for converting the multiphase power supply into the single-phase power supply, an input winding and a single-phase voltage output winding are arranged on a multiphase alternating current motor, a magnetic field is generated by the input winding and the single-phase voltage output winding, a stator output winding in the single-phase voltage output winding can generate a single-phase voltage under the action of the magnetic field, and the conversion mode has high reliability.
In order to achieve the above object, the present invention provides an apparatus for converting a multi-phase power into a single-phase power, comprising an input winding and a single-phase voltage output winding;
the input winding is arranged on a stator of the multi-phase alternating current motor and is used for accessing electric energy of a multi-phase power supply;
the input winding is at least a three-phase winding; the number of phases of the input winding is the same as that of the multi-phase power supply;
the single-phase voltage output winding is arranged on a stator output winding on the stator;
and the stator output winding is used for generating a synthesized rotating magnetic field when the input winding is connected with the multi-phase power supply, and providing the single-phase power supply for a load under the action of the synthesized rotating magnetic field.
The invention also provides a method for converting a multi-phase power supply into a single-phase power supply, which comprises the following steps:
generating a first rotating magnetic field with an input winding;
generating a second rotating magnetic field by using the single-phase voltage output winding;
synthesizing the first rotating magnetic field and the second rotating magnetic field to obtain a synthesized rotating magnetic field;
cutting a stator output winding of the single-phase voltage output winding with the synthetic rotating magnetic field to generate a single-phase output voltage; the single-phase output voltage is the output of the multi-phase power supply.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention relates to a device and a method for converting a multi-phase power supply into a single-phase power supply, wherein the device comprises an input winding and a single-phase voltage output winding; the input winding is arranged on a stator of the multi-phase alternating current motor; and the input winding is at least a three-phase winding; the number of phases of the input winding is the same as that of the multi-phase power supply; the single-phase voltage output winding comprises a stator output winding arranged on the stator and a rotor output winding arranged on the rotor; and the stator output winding is used for generating a synthesized rotating magnetic field when the input winding is connected with a multi-phase power supply, and providing the single-phase power supply for the load under the action of the synthesized rotating magnetic field. In the invention, the stator output winding generates single-phase voltage by using the corresponding magnetic fields generated by the input winding, the stator output winding and the rotor output winding only by arranging the input winding, the stator output winding and the rotor output winding on the multi-phase alternating current motor. The device does not need complicated rectifying and inverting devices, control algorithms and related filtering devices, has stronger overload capacity, and ensures the reliability of the device for converting the multi-phase power supply into the single-phase power supply. In addition, the conversion mode from the multi-phase power supply to the single-phase power supply can also provide a new scheme for symmetrical power supply arrangement of civil single-phase power distribution of the power system, and the symmetry of power loads is easier to guarantee, so that the negative sequence problem caused by load asymmetry in the system is reduced, the load asymmetry problem (such as a traction power supply system of an electric locomotive) caused by power supply of the single-phase load system by using the multi-phase power supply system is eliminated, the negative sequence current caused by load asymmetry is eliminated, and the reliability of the conversion mode from the multi-phase power supply to the single-phase power supply is further explained.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some implementation cases of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an apparatus for converting a multi-phase power supply into a single-phase power supply according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a Y-type connection of a three-phase winding when the input winding provided in embodiment 1 of the present invention is a three-phase winding;
fig. 3 is a schematic connection diagram of two-phase windings when the stator output winding provided in this embodiment 1 of the present invention is the two-phase winding;
fig. 4 is a schematic connection diagram of a single-phase winding when the stator output winding provided by this embodiment 1 of the present invention is a single-phase winding;
fig. 5 is a flowchart of a method for converting a multi-phase power into a single-phase power according to embodiment 2 of the present invention;
fig. 6 is a schematic view of a magnetic field when the stator output winding provided in this embodiment 2 of the present invention is a single-phase winding and the rotor output winding is a three-phase winding;
fig. 7 is a graph of the current flowing into the three-phase symmetrical winding of the rotor according to the embodiment 2 of the present invention;
fig. 8 is a schematic diagram of induced electromotive forces of three-phase windings on a stator according to embodiment 2 of the present invention;
fig. 9 is a schematic diagram of induced electromotive force of a single-phase winding on a stator according to embodiment 2 of the present invention;
fig. 10 is a graph of the current flowing in the three-phase winding of the stator according to the present embodiment 2 of the present invention;
fig. 11 is a graph showing the current flowing in the single-phase winding of the stator according to embodiment 2 of the present invention.
Description of the symbols:
1: an input winding; 2: a stator output winding; 3: a rotor output winding; 4: a stator; 5: and a rotor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a device and a method for converting a multi-phase power supply into a single-phase power supply, wherein an input winding and a single-phase voltage output winding are arranged on a multi-phase alternating current motor, a magnetic field is generated by the input winding and the single-phase voltage output winding, a stator output winding in the single-phase voltage output winding can generate a single-phase voltage under the action of the magnetic field, the multi-phase power supply is converted into the single-phase power supply, and the conversion mode has high reliability.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1
Referring to fig. 1, an apparatus for converting a multi-phase power into a single-phase power includes an input winding 1 and a single-phase voltage output winding 2;
the input winding 1 is arranged on a stator 4 of the multi-phase alternating current motor and is used for accessing electric energy of a multi-phase power supply;
the input winding is at least a three-phase winding; the phase number of the input winding and the phase number of the multi-phase alternating current motor are the same as the phase number of the multi-phase power supply; the number of phases can be three, four, five, six, seven, eight, nine, etc.;
the input windings are uniformly and symmetrically distributed on the space of the motor stator 4, namely the space included angle electrical angle between the windings is 360/(number of phases) degrees, and if the windings are three-phase symmetrical windings, the winding axes are mutually different by 120 degrees; if the winding is a four-phase winding, the axes of the windings are different from each other by 90 electrical angles; in the case of a five-phase motor, the winding axes are offset by 72 electrical degrees (the definition of electrical angles is described in "electromechanics", ISBN: 9787040535297, edited by gobo army, Liangyanping, and the Doudou army and published by advanced education publishers in 2020).
As shown in fig. 2, the input winding 1 is taken as a three-phase winding, and a Y-type (star connection) connection is adopted for the three-phase winding, but a delta connection may also be adopted for the three-phase winding. And are not intended to be limiting. In the context of figure 2, it is shown,
induced electromotive force in A1, B1 and C1 three-phase windings respectively;
power line voltage input to the three-phase winding for the three-phase power supply; r is1、x1σResistance and leakage reactance values of the three-phase winding are respectively;
respectively the line currents of the three-phase windings.
The single-phase voltage output winding 2 comprises a stator output winding 2 arranged on a stator 4 and a rotor output winding 3 arranged on a rotor 5;
and the stator output winding 2 is used for generating a synthesized rotating magnetic field by the input winding 1 and the single-phase voltage output winding when the input winding 1 is connected with the multi-phase power supply, and providing the single-phase power supply for a load under the action of the synthesized rotating magnetic field.
Two sets of windings are provided on a stator 4 of an ac motor, one of which is an input winding 1, which is an input winding of a multiphase power supply similar to a primary input winding of a transformer, and the other of which is a single-phase voltage output winding, which is an output winding of the multiphase power supply similar to a secondary output winding of the transformer, to which a single-phase device load is connected, and the single-phase voltage output winding includes two parts, one of which is a stator output winding 2 provided on the stator 4 and the other of which is a rotor output winding 3 provided on a rotor 5. For a single-phase voltage output winding, two design modes are provided in the embodiment.
The first method is to provide the stator output winding 2 as a two-phase winding, and the rotor output winding 3 may be a cage rotor of an induction motor or an excitation winding structure of a permanent magnet rotor or an electrically excited rotor of a synchronous motor. When the rotor 5 adopts a direct-current excitation winding of a synchronous motor, the control of the synthetic magnetic field can be realized, thereby achieving the effect of controlling the reactive power of the system. Therefore, the device of the embodiment can not only realize the conversion from the multiphase power supply to the single-phase power supply, but also realize the function of adjusting the reactive power of the power supply by controlling the exciting current of the rotor output winding 3. As shown in fig. 3, the stator output winding 2 is a connection diagram of two-phase windings; in the drawings
Induced electromotive forces in the A2 and B2 two-phase windings respectively;
is the output single-phase power supply voltage; r is2、x2σResistance and leakage reactance values of the two-phase windings are respectively; x is the number ofCA capacitor connected in series with the winding of the B2 phase;
respectively, the currents of two parallel windings.
In the first mode, the rotor 5 is free to rotate, and the rotor 5 may or may not be coupled to a mechanical load or a mechanical prime mover. If a prime mover or mechanical load is connected to the rotor shaft, it may also function as a motor and as a generator. The number of poles of the rotor 5 may be 2 poles, 4 poles, 6 poles, or the like, and is set as required.
It should be noted that, in the two-phase windings, one of the two-phase windings is required to be connected in series with a capacitor and then connected in parallel with the other phase winding, so that the axes of the two-phase windings are spatially different from each other by 90 electrical degrees. In addition, the number of turns of the two-phase winding is also required to be the same.
The second is a method in which the stator output winding 2 is a single-phase winding and the rotor output winding 3 is a three-phase winding, and in this case, the rotor 5 of the ac motor needs to be in a stationary state. As shown in fig. 4, the stator output winding 2 is a connection schematic diagram of a single-phase winding; in the drawings
Is induced electromotive force in A3 single-phase winding;
is the output single-phase power supply voltage; r is3、x3σResistance and leakage reactance value of a single-phase winding;
is the current of the single-phase output winding.
It should be noted that the schematic diagram shown in fig. 1 is only a schematic diagram of the arrangement of the input winding 1 (three-phase winding) and the stator output winding 2 (provided as two-phase winding) in the case of converting a three-phase power supply into a single-phase power supply. When the multi-phase power supply is a power supply with other phases, the three-phase winding is directly replaced by the winding with the corresponding phase number. The relative spatial positions of the axes of the input winding 1 and the stator output winding 2 can be arranged according to actual requirements.
In the embodiment, the transformation from the multi-phase power supply to the single-phase power supply is realized by using the electromagnetic induction law and the rotating magnetic field to construct the theory and arranging two sets of windings on the alternating current motor. Compared with the power electronic technology, the device based on the conversion from the multiphase power supply to the single-phase power supply has the advantages that the overload and impact resistance are only limited by the insulation heat effect of the motor winding, the overload and impact resistance are stronger, the device has advantages in some strong impact load application occasions, and the converted power supply waveform has high sine property.
In particular, the apparatus of this embodiment can realize the conversion from the single-phase power supply to the multi-phase power supply in addition to the conversion from the multi-phase power supply to the single-phase power supply. The specific method is to use a single-phase voltage output winding as an input winding, and the input winding as a single-phase voltage output winding.
Example 2
As shown in fig. 5, the present embodiment provides a method for converting a multi-phase power into a single-phase power, including:
step S1: generating a first rotating magnetic field by using the input winding 1;
wherein, step S1 specifically includes:
the input winding 1 is connected to a multi-phase power supply, the input winding 1 and the multi-phase power supply form a loop, multi-phase symmetric current is generated in the input winding 1, and the first rotating magnetic field is formed according to the rotating magnetic field theory.
Step S2: generating a second rotating magnetic field by using the single-phase voltage output winding;
considering that there are two ways of generating the second rotating magnetic field in the single-phase voltage output winding, which can be selected according to actual requirements, the following description will be separately made.
In the first mode, step S2 specifically includes:
the stator output winding 2 is arranged in a two-phase winding parallel connection mode, wherein one phase winding is connected with a capacitor in series and then is connected with the other phase winding in parallel;
forming a loop by the stator output winding 2 and a load, generating two currents with phases different by 90 degrees in electrical angle in the stator output winding 2, and forming a first stator rotating magnetic field according to the rotating magnetic field theory;
a rotor output winding 3 in the single-phase voltage output winding is set to be a cage type rotor of an induction motor or an excitation winding structure of a permanent magnet rotor or an electric excitation rotor of a synchronous motor;
forming a first rotor rotating magnetic field by utilizing an excitation mode of the excitation winding; the second rotating magnetic field includes the first stator rotating magnetic field and the first rotor rotating magnetic field.
In the second mode, step S2 specifically includes:
the stator output winding 2 is set to be a single-phase winding;
forming a loop by the stator output winding 2 and a load, generating current in the stator output winding 2, and forming a second stator rotating magnetic field according to the rotating magnetic field theory;
setting a rotor output winding 3 in the single-phase voltage output winding as a three-phase winding;
keeping the rotor 5 in a static state and accessing the rotor output winding 3 with symmetrical current with the phase sequence opposite to that of the input winding 1, wherein the rotor output winding 3 generates a second rotor rotating magnetic field according to the rotating magnetic field theory;
and offsetting the negative sequence rotating magnetic field in the second stator rotating magnetic field by using the second rotor rotating magnetic field to obtain a positive sequence rotating magnetic field of the second stator rotating magnetic field, namely a second rotating magnetic field. As shown in fig. 6, the magnetic field distribution generated when the stator output winding 2 is a single-phase winding and the rotor output winding 3 is a three-phase winding is given; in the figure, Fr is the amplitude of the magnetomotive force of the reverse rotating magnetic field formed in the three-phase winding of the rotor in a stationary state, FMono-Is a counter-rotating negative-sequence magnetic field, F, generated in a single-phase winding of the statorSingle +Is a positive sequence rotating magnetic field in a single phase winding.
Step S3: synthesizing the first rotating magnetic field and the second rotating magnetic field to obtain a synthesized rotating magnetic field;
step S4: cutting a stator output winding 2 of the single-phase voltage output winding by using the synthetic rotating magnetic field to generate a single-phase output voltage; the single-phase output voltage is the output of the multi-phase power supply.
In order to make the technical scheme of the invention clearly understood by those skilled in the art, the following description will be made by taking the example of converting a three-phase power supply into a single-phase power supply:
a set of three-phase windings for power input and a set of windings for power output are arranged on the three-phase alternating current motor. The three-phase input winding 1 is arranged in the same way as the three-phase winding of the industrial motor, and the single-phase voltage output winding can be arranged in two ways, which are respectively explained as follows:
the method specifically realizes the phase number conversion process as follows:
1) the input winding 1 is a three-phase symmetrical winding, a three-phase symmetrical power supply is connected to the three-phase symmetrical winding, the three-phase symmetrical winding and the power supply form a loop, and three-phase symmetrical current flows through the three-phase symmetrical winding, so that a rotating magnetic field F is formed3 in(first rotating magnetic field) whose amplitude can be determined by the formula (1), wherein Fφ1Amplitude of the magnetomotive force of the single-phase winding, thetasThe method comprises the following steps of (1) taking a space mechanical electrical angle of a motor, omega is a power supply frequency, and t is power supply conversion time;
2) the stator output winding 2 is composed of two-phase windings, the two-phase windings have the same number of turns and are arranged in a mode that the axes of the two-phase windings mutually differ by 90 electrical angles in space, after a capacitor is connected in series into one phase winding, the two-phase winding and the other phase winding output electric energy in a parallel connection mode, the two-phase winding and a load form a loop, current flows through the two-phase winding, and the current passes through the capacitor xCBy shifting the phase of
And
equal in magnitude and 90 degrees out of phase to form a resultant magnetic field F2 in(first stator rotating magnetic field) whose amplitude can be determined by equation (2);
F2 in＝Fφ1cos(θs-ωt) (2)
3) The two rotating magnetic fields in the stator 4 of the motor, in addition to the rotating magnetic field of the rotor 5 (the second stator rotating magnetic field), form a resultant magnetic field that cuts the three-phase winding (input winding) on the stator 4 and the two-phase winding (output winding) on the stator 4, respectively, to generate induced electromotive force in the three-phase winding on the stator 4
Induced electromotive force is generated in the two-phase winding on the stator 4
Induced electromotive force in the three-phase winding is used as a load of a three-phase power supply to be balanced with the three-phase power supply, so that electric energy of the three-phase power supply is absorbed, and the three-phase power supply is connected; two induced electromotive forces generated by the two-phase windings are connected in parallel and then are used as an output power source to be balanced with a load, and a single-phase power source is provided for the load, so that the power source is converted from a three-phase power source to a single-phase power source.
The second mode specifically realizes the phase number conversion process as follows:
1) the input winding 1 is a three-phase symmetrical winding, and the process of generating the first rotating magnetic field is the same as 1) in the first mode, which is not described herein again.
2) The stator output winding 2 consists of a single-phase winding which forms a loop with the load, and current flows through the winding to form a pulsating magnetic field FSheet(second stator rotating magnetic field) whose amplitude can be determined by equation (3);
Fsheet＝FSingle ++FMono- (3)
In the formula (3) FSingle +Is a positive-sequence rotating magnetic field in a single-phase winding, FMono-Is a reverse rotating negative sequence magnetic field generated in a stator single-phase winding, which is respectively as follows:
the rotor output winding 3 is set to be a three-phase symmetrical winding while the rotor 5 is in a stationary state, and a symmetrical current having a phase sequence opposite to that of the three-phase winding on the stator 4 is input to the three-phase symmetrical winding on the rotor 5, as shown in fig. 7, IRA: the current curve of the A phase in the three-phase symmetrical winding on the rotor 5 is introduced; i isRB: a current curve of the B phase in the three-phase symmetrical winding on the rotor 5 is introduced; i isRC: a C-phase current curve in the three-phase symmetrical winding on the rotor 5 is introduced; the abscissa of the graph represents time and the ordinate represents current values such that the counter-rotating magnetic field F is generated in the three-phase winding on the rotor 5rAnd make Fr＝-FSingle +To cancel out the reverse-rotating negative-sequence magnetic field F generated in the single-phase winding on the stator 4Mono-(second rotor rotating field), (as shown in fig. 6), so that there is only a positive sequence rotating field F in the single phase windingSingle +(second rotating magnetic field).
3) The first rotating magnetic field and the second rotating magnetic field are synthesized to obtain a synthesized magnetic field, the synthesized magnetic field cuts the three-phase winding on the stator 4 and the single-phase winding on the stator 4 respectively, and induced electromotive force is generated in the three-phase winding on the stator 4
As shown in FIG. 8, EWA: induced electromotive force of A phase winding in three phase winding on the stator 4; eWB: induced electromotive force of a B-phase winding in a three-phase winding on the stator 4; eWC: induced electricity of C-phase winding in three-phase winding on stator 4And (4) the action. Induced electromotive force is generated in a single-phase winding on the stator 4
As shown in FIG. 9, EWS: induced electromotive force in the single-phase winding on the stator 4. The induced electromotive force in the three-phase winding is balanced with the input power as the load of the input power to absorb the power of the power, as shown in fig. 10, IWA: a current curve flowing into an A-phase winding in a three-phase winding on the stator 4; i isWB: a current curve flowing into a B-phase winding in a three-phase winding on the stator 4; i isWC: the current flowing in the C-phase winding of the three-phase winding on the stator 4 is plotted. The induced electromotive force generated by the single-phase winding is balanced with the load as an output power source, and the power source is output to the load, as shown in fig. 11, IWS: the value of the current flowing in the single-phase winding of the stator 4 converts the power from three phases to a single-phase power.
In this embodiment, the two rotating magnetic fields in the stator 4 of the motor, together with the rotating magnetic field of the rotor 5, form a composite magnetic field that cuts the stator multiphase input winding 1 and the stator output winding 2, respectively, and generates induced electromotive force in both the multiphase winding and the single-phase voltage output winding. The induced electromotive force in the multi-phase winding is used as a load of an input power supply and is connected into the multi-phase power supply, the induced electromotive force of the stator output winding 2 is used as an output power supply and outputs a single-phase power supply to the load, so that the power supply is converted from the multi-phase power supply to the single-phase power supply, and the conversion function from the multi-phase power supply to the single-phase power supply is realized. The principle of the electromagnetic induction based on which the rotating magnetic field is cut by the winding realizes the phase-number transformation is different from the technical principle of rectification and inversion by the power electronic technology. And the method only realizes the conversion from the multiphase power supply to the single-phase power supply without changing the power supply frequency.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. An apparatus for converting a multiphase power to a single phase power, comprising an input winding and a single phase voltage output winding;
the input winding is arranged on a stator of the multi-phase alternating current motor and is used for accessing electric energy of a multi-phase power supply;
the input winding is at least a three-phase winding, and the number of phases of the input winding is the same as that of the multi-phase power supply;
the single-phase voltage output winding comprises a stator output winding arranged on the stator and a rotor output winding arranged on the rotor;
and the stator output winding is used for generating a synthesized rotating magnetic field when the input winding is connected with the multi-phase power supply, and providing the single-phase power supply for a load under the action of the synthesized rotating magnetic field.
2. The apparatus of claim 1, wherein the stator output winding is a two-phase winding, and the rotor output winding is an excitation structure of a cage rotor of an induction motor or a permanent magnet rotor or an electrically excited rotor of a synchronous motor.
3. The apparatus of claim 2, wherein one of the two phase windings is connected in series with a capacitor and then connected in parallel with the other phase winding.
4. The apparatus of claim 3, wherein the two phase windings have the same number of coil turns.
5. The apparatus of claim 1, wherein the stator output winding is a single phase winding and the rotor output winding is a three phase winding.
6. The apparatus of claim 5 wherein the rotor remains stationary when the rotor output windings are the three phase windings.
7. A method for converting a multiphase power to a single phase power based on the apparatus of any one of claims 1 to 6, comprising:
generating a first rotating magnetic field with an input winding;
generating a second rotating magnetic field by using the single-phase voltage output winding;
synthesizing the first rotating magnetic field and the second rotating magnetic field to obtain a synthesized rotating magnetic field;
cutting a stator output winding of the single-phase voltage output winding with the synthetic rotating magnetic field to generate a single-phase output voltage; the single-phase output voltage is the output of the multi-phase power supply.
8. The method according to claim 7, wherein said utilizing the first rotating magnetic field generated by the input winding comprises:
and connecting the input winding into a multi-phase power supply, wherein the input winding and the multi-phase power supply form a loop, generating multi-phase symmetrical current in the input winding, and forming the first rotating magnetic field according to the rotating magnetic field theory.
9. The method according to claim 8, wherein the generating a second rotating magnetic field with the single-phase voltage output winding comprises:
the stator output winding is arranged in a two-phase winding parallel connection mode, wherein one phase winding is connected with a capacitor in series and then is connected with the other phase winding in parallel;
forming a loop by the stator output winding and a load, generating two currents with phases different by 90 degrees in electrical angle in the stator output winding, and forming a first stator rotating magnetic field according to the rotating magnetic field theory;
setting a rotor output winding in the single-phase voltage output winding to be a cage type rotor of an induction motor or an excitation winding structure of a permanent magnet rotor or an electric excitation rotor of a synchronous motor;
forming a first rotor rotating magnetic field by utilizing an excitation mode of the excitation winding; the second rotating magnetic field includes the first stator rotating magnetic field and the first rotor rotating magnetic field.
10. The method according to claim 8, wherein the generating a second rotating magnetic field with the single-phase voltage output winding comprises:
setting the stator output winding as a single-phase winding;
forming a loop by the stator output winding and a load, generating current in the stator output winding, and forming a second stator rotating magnetic field according to the rotating magnetic field theory;
setting a rotor output winding in the single-phase voltage output winding as a three-phase winding;
keeping the rotor in a static state and connecting symmetrical current with the rotor output winding in a phase sequence opposite to that of the input winding, wherein the rotor output winding generates a second rotor rotating magnetic field according to the rotating magnetic field theory;
and offsetting the negative sequence rotating magnetic field in the second stator rotating magnetic field by using the second rotor rotating magnetic field to obtain a positive sequence rotating magnetic field of the second stator rotating magnetic field, namely a second rotating magnetic field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110571183.2A CN113285651B (en) | 2021-05-25 | 2021-05-25 | Device and method for converting multiphase power supply into single-phase power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110571183.2A CN113285651B (en) | 2021-05-25 | 2021-05-25 | Device and method for converting multiphase power supply into single-phase power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113285651A true CN113285651A (en) | 2021-08-20 |
| CN113285651B CN113285651B (en) | 2023-04-25 |
Family
ID=77281560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110571183.2A Active CN113285651B (en) | 2021-05-25 | 2021-05-25 | Device and method for converting multiphase power supply into single-phase power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113285651B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2286337Y (en) * | 1996-12-04 | 1998-07-15 | 朱彦鸣 | Three-phase input single-phase output voltage transformer |
| CN206040409U (en) * | 2016-07-06 | 2017-03-22 | 蒋光祖 | Covert transformer of balance of three -phase input two -phase output |
| CN208353222U (en) * | 2018-07-05 | 2019-01-08 | 西南交通大学 | A kind of Universal flexible Energy Management System based on Modular multilevel converter |
| CN109450205A (en) * | 2019-01-08 | 2019-03-08 | 中铁电气化局集团有限公司第二工程分公司 | A kind of three-phase symmetrical alternating current becomes the alternating current generator of single-phase alternating current |
-
2021
- 2021-05-25 CN CN202110571183.2A patent/CN113285651B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2286337Y (en) * | 1996-12-04 | 1998-07-15 | 朱彦鸣 | Three-phase input single-phase output voltage transformer |
| CN206040409U (en) * | 2016-07-06 | 2017-03-22 | 蒋光祖 | Covert transformer of balance of three -phase input two -phase output |
| CN208353222U (en) * | 2018-07-05 | 2019-01-08 | 西南交通大学 | A kind of Universal flexible Energy Management System based on Modular multilevel converter |
| CN109450205A (en) * | 2019-01-08 | 2019-03-08 | 中铁电气化局集团有限公司第二工程分公司 | A kind of three-phase symmetrical alternating current becomes the alternating current generator of single-phase alternating current |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113285651B (en) | 2023-04-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Xiong et al. | Design of a low-harmonic-content wound rotor for the brushless doubly fed generator | |
| Abdel-Khalik et al. | Application of standard three-phase stator frames in prime phase order multiphase machine construction | |
| Shao et al. | Investigation on phase shift between multiple multiphase windings in flux-switching permanent magnet machines | |
| Zhang et al. | A brushless doubly fed generator based on permanent magnet field modulation | |
| Boldea et al. | Fractional kVA rating PWM converter doubly fed variable speed electric generator systems: An overview in 2020 | |
| Inoue et al. | A brushless self-exciting three-phase synchronous generator utilizing the 5th-space harmonic component of magneto motive force through armature currents | |
| Cheng et al. | Design and analysis of a dual-stator brushless doubly-fed induction machine with a staggered dual-cage rotor | |
| Wang et al. | Study of multiphase superconducting wind generators with fractional-slot concentrated windings | |
| Abdel-Khalik et al. | Magnetic gearbox with an electric power output port and fixed speed ratio for wind energy applications | |
| JP2017063518A (en) | Rotary electric machine system | |
| CN113285651B (en) | Device and method for converting multiphase power supply into single-phase power supply | |
| Zhao et al. | Comparative Research on Four-Phase Dual Armature-Winding Wound-Field Doubly Salient Generator With Distributed Field Magnetomotive Forces for High-Reliability Application | |
| Suhel et al. | Modelling, design and analysis of multi-phase induction motor | |
| CN113178845B (en) | Alternating current power supply phase number conversion method and device | |
| CN101976923A (en) | Hybrid excitation permanent magnet motor with secondary harmonic excitation | |
| CN114400798B (en) | Single-winding direct-current excitation brushless double-fed motor and control circuit thereof | |
| Meena et al. | Bi-Furcated Stator Winding Configuration in Three-Phase Induction Generators for Wind Power Generation | |
| Khan et al. | Harmonics Analysis of Six-Phase Induction Motor Drive | |
| Abdulla | New system for power transfer between two asynchronous grids using twin stator induction machine | |
| Ahmed et al. | Reduction of cogging torque and back EMF harmonics in modulated pole machine by variations in tooth span | |
| Zhu et al. | A novel five phase fault tolerant doubly salient electromagnetic generator for direct driven wind turbine | |
| CN114123712B (en) | Voltage converter based on double-stator electric excitation synchronous motor design | |
| Dusane et al. | Analysis of the Synchronous Machine in its Operational Modes: Motor, Generator and Compensator | |
| Kan et al. | Soft-starting brushless doubly fed machine winding design and magnetic field analysis | |
| Baziruwiha et al. | Triple Three-Phase High Pole Number Non-Overlap Winding Reluctance Synchronous Wind Generator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |