CN111082622A - Decoupling type birotor alternating pole permanent magnet motor - Google Patents

Decoupling type birotor alternating pole permanent magnet motor Download PDF

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Publication number
CN111082622A
CN111082622A CN202010025325.0A CN202010025325A CN111082622A CN 111082622 A CN111082622 A CN 111082622A CN 202010025325 A CN202010025325 A CN 202010025325A CN 111082622 A CN111082622 A CN 111082622A
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CN
China
Prior art keywords
rotor
stator
permanent magnet
stator teeth
motor
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.)
Pending
Application number
CN202010025325.0A
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Chinese (zh)
Inventor
李烽
王凯
孙海阳
孔金旺
张琳
张国豪
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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Application filed by Nanjing University of Aeronautics and Astronautics filed Critical Nanjing University of Aeronautics and Astronautics
Priority to CN202010025325.0A priority Critical patent/CN111082622A/en
Publication of CN111082622A publication Critical patent/CN111082622A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K16/00Machines with more than one rotor or stator
    • H02K16/02Machines with one stator and two or more rotors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12Stationary parts of the magnetic circuit
    • H02K1/14Stator cores with salient poles
    • H02K1/146Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • H02K1/148Sectional cores
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • H02K1/2706Inner rotors
    • H02K1/272Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278Surface mounted magnets; Inset magnets
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • H02K1/2786Outer rotors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/04Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/18Windings for salient poles
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/04Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28Layout of windings or of connections between windings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K2201/00Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/03Machines characterised by aspects of the air-gap between rotor and stator
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K2213/00Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/12Machines characterised by the modularity of some components

Abstract

The invention discloses a decoupling type dual-rotor alternating pole permanent magnet motor which comprises an inner rotor, an outer rotor and a plurality of modular stators, wherein all the modular stators are sequentially spliced to form a complete stator, each modular stator comprises a stator yoke part, and inner stator teeth and outer stator teeth which are respectively positioned at two sides of the stator yoke part, armature windings are wound on all the inner stator teeth, armature windings are wound on all or part of the outer stator teeth, the armature windings which belong to the same phase on all the outer stator teeth are sequentially connected end to form a phase, and the armature windings which belong to the same phase on all the inner stator teeth are sequentially connected end to form a phase; for the inner rotor and the outer rotor, one of the rotors is a surface-mounted rotor, the other rotor is a salient pole rotor, the surface of the surface-mounted rotor is completely covered by permanent magnets, and the permanent magnets are arranged between adjacent salient pole iron cores of the salient pole rotors to form an alternating pole permanent magnet rotor. The invention solves the problem of electromagnetic coupling between the inner stator and the outer stator of the double-rotor permanent magnet motor and improves the output performance of the motor.

Description

Decoupling type birotor alternating pole permanent magnet motor
Technical Field
The invention belongs to the field of motors, and particularly relates to a decoupling permanent magnet motor.
Background
The permanent magnet motor has the advantages of high torque density, high power density, good weak magnetic performance, high efficiency and the like, and is particularly suitable for running in a full speed range, so the permanent magnet motor has wide application prospect in the application fields of hybrid electric vehicles and the like. At present, hybrid electric vehicles are widely researched due to the fact that pure electric schemes of composite structure (double-rotor) motors are mature day by day. A Double-rotor Double-Mechanical-port magnetic flux Switching Motor structure is provided in a document 'multilevel design Optimization and Operation of a Brush Double Mechanical port flux-Switching Motor' published in IEEE Transactions on industrial electronics, and has the advantages of high torque density, low torque pulsation, strong robustness of a salient-pole rotor and the like. However, the inner stator winding and the outer stator winding of the motor have large electromagnetic coupling, and the output torque quality of the motor is seriously influenced.
Disclosure of Invention
In order to solve the technical problems mentioned in the background art, the invention provides a decoupling type double-rotor alternating-pole permanent magnet motor.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
a decoupling type birotor alternating pole permanent magnet motor comprises an inner rotor, an outer rotor and a plurality of modular stators, wherein all the modular stators are sequentially spliced to form a complete stator, the stator is positioned between the inner rotor and the outer rotor and respectively forms independent air gaps with the inner rotor and the outer rotor, each modular stator comprises a stator yoke part, and inner stator teeth and outer stator teeth which are respectively positioned at two sides of the stator yoke part, the inner stator teeth are close to the inner rotor, the outer stator teeth are close to the outer rotor, armature windings are wound on all the inner stator teeth, armature windings are wound on all or part of the outer stator teeth, the armature windings which belong to the same phase are sequentially connected end to form a phase, and the armature windings which belong to the same phase are sequentially connected end to form a phase on each inner stator tooth; and for the inner rotor and the outer rotor, one of the inner rotor and the outer rotor is a surface-mounted rotor, the other one of the inner rotor and the outer rotor is a salient pole rotor, the surface of the surface-mounted rotor is completely covered by permanent magnets, and the permanent magnets are arranged between adjacent salient pole iron cores of the salient pole rotor to form an alternating pole permanent magnet rotor.
Furthermore, each modular stator comprises n inner stator teeth and m outer stator teeth, wherein n is larger than or equal to 1, and m is larger than or equal to 1.
Furthermore, each modular stator comprises a inner stator teeth, b complete outer stator teeth and two half outer stator teeth positioned on two sides of the b complete outer stator teeth, the half outer stator teeth on the adjacent modular stators are spliced to form a complete outer stator tooth, armature windings are not wound on the outer stator teeth formed by splicing the half outer stator teeth, a is larger than or equal to 1, and b is larger than or equal to 1.
Furthermore, the number of pairs of permanent magnet poles of the inner rotor and the outer rotor is different, and armature magnetomotive force harmonics contained in armature windings on the inner stator and the outer stator are different.
Furthermore, the polarities of the adjacent permanent magnets on the surface of the surface-mounted rotor are opposite, and the polarities of all the permanent magnets on the permanent magnet rotor with the alternate poles are the same.
Furthermore, each modular stator is formed by independent punching, then an armature winding is wound, and finally all the modular stators are assembled in a splicing mode.
Furthermore, the armature winding adopts a concentrated single-tooth winding mode.
Further, the inner rotor and the outer rotor can be operated synchronously or asynchronously.
Further, the inner rotor and the outer rotor can be coaxially output or output through two mechanical ports.
Furthermore, the inner motor and the outer motor can be electrically operated and generate electricity.
Furthermore, the positions of the inner motor and the outer motor are adaptively changed according to the application scene of the motors.
Adopt the beneficial effect that above-mentioned technical scheme brought:
(1) the invention solves the problem of electromagnetic coupling between the inner stator winding and the outer stator winding of the double-rotor double-mechanical-port permanent magnet motor, improves the output torque quality of the motor when the motor is in electric operation, and improves the output electric energy quality when the motor is in power generation operation;
(2) the rotor adopts an alternating pole structure, so that the use amount of the permanent magnet is reduced, and the utilization rate of the permanent magnet is improved;
(3) the stator is modularized, so that the processing and batch production are facilitated, the processed modularized stator can be directly wound and then assembled to complete assembly, and the production process and the assembly process are simplified;
(4) the inner rotor and the outer rotor of the invention can be synchronous or asynchronous, and the output electromagnetic performance of the motor can not be influenced; the inner stator armature winding and the outer stator armature winding of the motor do not have back electromotive force electromagnetic coupling when the motor operates synchronously or asynchronously.
Drawings
FIG. 1 is a schematic view of example 1 of the present invention; description of reference numerals: 1. an outer rotor; 2. permanent magnets on the outer rotor; 3. a modular stator; 4. armature windings on the outer stator; 5. armature windings on the inner stator; 6. permanent magnets on the inner rotor; 7. an inner rotor; 8. an inner air gap; 9. an outer air gap;
FIG. 2 is a schematic modular stator numbering according to embodiment 1 of the present invention; description of reference numerals: 3. 10-20, a modular stator;
fig. 3 is a schematic view of a structure of a modular stator in embodiment 1 of the present invention;
FIG. 4 is a schematic view of example 2 of the present invention; description of reference numerals: 21-44, outer stator teeth number;
fig. 5 is a schematic view of a modular stator structure in embodiment 2 of the present invention;
FIG. 6 is a schematic view of embodiment 3 of the present invention;
fig. 7 is a schematic view of a modular stator structure in embodiment 3 of the present invention;
FIG. 8 is the back electromotive force waveform of the inner and outer stators of the motor when the inner rotor is stationary and the outer rotor rotates at 400 rpm respectively and the motor is unloaded in the motor structure of embodiment 1;
FIG. 9 is a waveform diagram of back electromotive forces of inner and outer stators of the motor when the inner and outer rotors rotate at 400 rpm and 300 rpm, respectively, and the motor is unloaded in accordance with embodiment 1;
fig. 10 is a diagram showing a back electromotive force waveform of an inner stator of a motor and a voltage waveform of a terminal voltage of an outer stator when inner and outer rotors rotate at 400 rpm and 300 rpm, respectively, and the motor of the outer stator of the motor is loaded and the motor of the inner stator is unloaded in example 1.
Detailed Description
The technical scheme of the invention is explained in detail in the following with the accompanying drawings.
Example 1
As shown in fig. 1, a decoupled dual-rotor alternating-pole permanent magnet motor includes an inner rotor 7, an outer rotor 1 and a plurality of modular stators 3, all the modular stators 3 are sequentially spliced to form a complete stator, and the stator is located between the inner rotor 7 and the outer rotor 1 and forms air gaps 8 and 9 with the inner rotor 7 and the outer rotor 1, respectively. Each modular stator 3 comprises a stator yoke portion, and inner stator teeth and outer stator teeth which are respectively positioned on two sides of the stator yoke portion, the inner stator teeth are close to the inner rotor 7, the outer stator teeth are close to the outer rotor 1, and armature windings 5 and 4 are wound on the inner stator teeth and the outer stator teeth. For the inner rotor 7 and the outer rotor 1, one is a surface-mounted rotor, the other is a salient pole rotor, the surface of the surface-mounted rotor is completely covered by permanent magnets 6, and permanent magnets 2 are arranged between adjacent salient pole iron cores of the salient pole rotors to form an alternating pole permanent magnet rotor.
According to the number of stator slots and the number of inner and outer rotor poles, it can be known that the inner rotor motor in fig. 1 is a 12-slot 8-pole permanent magnet synchronous motor, and the outer rotor motor is a 12-slot 14-pole permanent magnet synchronous motor. The connection of the armature windings to the inner and outer stator teeth will be described with reference to fig. 2, taking a three-phase winding as an example. Fig. 2 contains 12 modular stators, each of which is constructed as shown in fig. 3. Because the inner rotor motor is a 12-slot 8-pole permanent magnet synchronous motor, namely 4 3-slot 2-pole permanent magnet synchronous motors, according to a slot potential star diagram of the motor, the motor takes 3 slots as a motor unit, the inner stator teeth on the modular stators 3, 10 and 11 are respectively wound with an A-phase positive coil, a B-phase positive coil and a C-phase positive coil, and the coils on the inner stator teeth on the modular stators 12 to 20 are repeated for 3 times by taking the coils on the inner stator teeth on the modular stators 3, 10 and 11 as a repeating unit. Coils which are in the same phase on the inner stator teeth are sequentially connected end to form a phase. The coils on the outer stator teeth of the outer rotor motor are connected by a slot potential star diagram of a 12-slot 14-pole permanent magnet synchronous motor. A phase negative coil is wound on the outer stator teeth on the modular stators 3 and 14, an A phase positive coil is wound on the outer stator teeth on the modular stators 15 and 20, a phase negative coil is wound on the outer stator teeth on the modular stators 10 and 17, a phase positive coil is wound on the outer stator teeth on the modular stators 11 and 16, a phase negative coil is wound on the outer stator teeth on the modular stators 13 and 18, and a phase positive coil is wound on the outer stator teeth on the modular stators 12 and 19. Coils belonging to the same phase on the outer stator teeth are sequentially connected end to form a phase.
The decoupling principle of the inner and outer two motors is explained by combining the pole slot matching of the inner and outer rotor motors: the three-phase armature reaction harmonic of the inner rotor motor is Pi4 k (k is a positive integer greater than 0 and not equal to a multiple of 3 and 3), and the three-phase armature reaction harmonic of the outer rotor motor is Po2 k-1. The armature reaction of the inner rotor motor and the outer rotor motor shows that the three-phase armature reaction harmonic of the inner rotor motor is even, the three-phase armature reaction harmonic of the outer rotor motor is odd, and no intersection exists between the three-phase armature reaction harmonic and the odd. Because the counter electromotive force induction principle is consistent with the armature reaction, no coupling phenomenon exists between the induction counter electromotive forces of the inner rotor motor and the outer rotor motor, and the counter electromotive forces are not influenced.
Example 2
The structure shown in fig. 4 is a preferred embodiment of the present invention, and the structure of the motor is the same as that of embodiment 1 except for the structure of the modular stator, which is shown in fig. 5. In the embodiment, the outer stator adopts a 24-slot structure, the outer rotor adopts a 26-pole structure, the back electromotive force decoupling principle of the motor structure is similar to that in the embodiment 1, and the back electromotive force decoupling of the inner stator and the outer stator is realized by adopting the idea that the armature reaction harmonics of the inner stator and the outer stator are not crossed.
The connection of the windings on the motor inner stator in this embodiment is exactly the same as in embodiment 1. The main difference is the winding connections on the 24-slot outer stator. A-phase negative coils are wound on the outer stator teeth 21, 23, 34 and 36, A-phase positive coils are wound on the outer stator teeth 22, 24, 33 and 35, C-phase positive coils are wound on the outer stator teeth 25, 27, 38 and 40, C-phase negative coils are wound on the outer stator teeth 26, 28, 37 and 39, B-phase negative coils are wound on the outer stator teeth 30, 32, 41 and 43, B-phase negative coils are wound on the outer stator teeth 29, 31, 42 and 44, and coils belonging to the same phase on the 24 outer stator teeth are sequentially connected end to form one phase.
The structure shown in fig. 6 is another preferred embodiment of the present invention, and the structure of the motor is the same as that of embodiment 1 except for the structure of the modular stator, which is shown in fig. 7. Each modular stator comprises an inner stator tooth, a complete outer stator tooth and two half outer stator teeth positioned on two sides of the complete outer stator tooth, and the half outer stator teeth on the adjacent modular stators are spliced to form the complete outer stator tooth. The modularization method can enable the outer stator teeth to be mechanically wound with wires firstly, then the motor stator is finally assembled and molded in transportation, the modularization method can reduce friction damage of the stator module to the armature winding on the outer stator in the transportation process, and the reliability of motor processing and production is improved. In the embodiment, the armature winding is not wound on the outer stator teeth formed by splicing the half outer stator teeth, and the physical isolation capacity between phases of the motor is improved by adopting the winding of the separation teeth, so that the operation reliability of the motor can be improved.
The winding connection mode of the inner stator motor in the embodiment is completely the same as that of the inner stator motor in the embodiment 2, the method of tooth spacing winding is adopted on the outer stator, and the number of turns of the coil on each outer stator tooth is doubled. The principle of back emf decoupling on the inner and outer stators in this embodiment is similar to embodiment 1.
Fig. 8 is a diagram showing back electromotive force waveforms of the inner and outer stators of the motor when the inner rotor is stationary and the outer rotor is rotated at 400 rpm respectively and the motor is unloaded in embodiment 1 (A, B, C is the back electromotive force waveform of the outer stator, X, Y, Z is the back electromotive force waveform of the inner stator in the figure). Fig. 9 is a diagram showing back electromotive force waveforms of the inner and outer stators of the motor when the inner and outer rotors rotate at 400 rpm and 300 rpm, respectively, and the motor is unloaded in embodiment 1 (A, B, C is the back electromotive force waveform of the outer stator, X, Y, Z is the back electromotive force waveform of the inner stator). Fig. 10 is a diagram showing a back electromotive force waveform of an inner stator and a voltage waveform of an outer stator when an outer stator motor of the motor is loaded and an inner stator motor is unloaded in the case that inner and outer rotors are rotated at 400 rpm and 300 rpm, respectively, according to example 1 (in the diagram, A, B, C is a voltage waveform of an outer stator terminal, X, Y, Z is a back electromotive force waveform of an inner stator). It can be seen from the figure that the motion state of the inner rotor does not affect the no-load back electromotive force of the outer rotor motor, and in addition, whether the outer rotor motor is loaded or not does not affect the back electromotive force of the inner rotor motor, and the subject idea of the invention is verified by the finite element result, so that the correctness of the invention is also verified.
The above embodiments are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, for example, the conventional inner permanent magnet rotor and outer alternating pole rotor may have various structures, such as a V-shaped rotor structure, a spoke rotor structure, a halbach arrangement rotor structure, etc., the present invention has been explained by taking three phases as an example, the present invention patent can be extended to a decoupling type dual rotor dual mechanical port permanent magnet motor with M-phase pole slot matching, and can also be extended to a plurality of motors, such as an axial flux, a linear motor, etc., and any modification made on the basis of the technical scheme according to the technical idea provided by the present invention falls within the protection scope of the present invention.

Claims (10)

1. A decoupling type birotor alternating pole permanent magnet motor is characterized in that: the modularized stator structure comprises an inner rotor, an outer rotor and a plurality of modularized stators, wherein all the modularized stators are sequentially spliced to form a complete stator, the stator is positioned between the inner rotor and the outer rotor and respectively forms independent air gaps with the inner rotor and the outer rotor, each modularized stator comprises a stator yoke part, and inner stator teeth and outer stator teeth which are respectively positioned at two sides of the stator yoke part, the inner stator teeth are close to the inner rotor, the outer stator teeth are close to the outer rotor, armature windings are wound on all the inner stator teeth, armature windings are wound on all or part of the outer stator teeth, the armature windings which are in the same phase are sequentially connected end to form a phase, and the armature windings which are in the same phase are sequentially connected end to form a phase on each inner stator; and for the inner rotor and the outer rotor, one of the inner rotor and the outer rotor is a surface-mounted rotor, the other one of the inner rotor and the outer rotor is a salient pole rotor, the surface of the surface-mounted rotor is completely covered by permanent magnets, and the permanent magnets are arranged between adjacent salient pole iron cores of the salient pole rotor to form an alternating pole permanent magnet rotor.
2. The decoupled dual rotor alternating pole permanent magnet machine of claim 1, wherein: each modular stator comprises n inner stator teeth and m outer stator teeth, wherein n is larger than or equal to 1, and m is larger than or equal to 1.
3. The decoupled dual rotor alternating pole permanent magnet machine of claim 1, wherein: each modular stator comprises a inner stator teeth, b complete outer stator teeth and two half outer stator teeth positioned on two sides of the b complete outer stator teeth, the half outer stator teeth on the adjacent modular stators are spliced to form the complete outer stator teeth, armature windings are not wound on the outer stator teeth formed by splicing the half outer stator teeth, a is larger than or equal to 1, and b is larger than or equal to 1.
4. The decoupled dual rotor alternating pole permanent magnet machine of claim 1, wherein: the permanent magnet pole pairs of the inner rotor and the outer rotor are different, and armature magnetomotive force harmonics contained in armature windings on the inner stator and the outer stator are different.
5. The decoupled dual rotor alternating pole permanent magnet machine of claim 1, wherein: the polarities of the adjacent permanent magnets on the surface of the surface-mounted rotor are opposite, and the polarities of all the permanent magnets on the permanent magnet rotor with the alternate poles are the same.
6. The decoupled dual rotor alternating pole permanent magnet machine of claim 1, wherein: each modular stator is formed by independent stamping, then an armature winding is wound, and finally all the modular stators are assembled in a splicing mode.
7. The decoupled dual rotor alternating pole permanent magnet machine of claim 1, wherein: the armature winding adopts a concentrated single-tooth winding mode.
8. The decoupled dual rotor alternating pole permanent magnet machine of claim 1, wherein: the inner rotor and the outer rotor can synchronously or asynchronously operate; the inner rotor and the outer rotor can be coaxially output or output through double mechanical ports.
9. The decoupled dual rotor alternating pole permanent magnet machine of claim 1, wherein: the inner and outer motors can be operated electrically and generate electricity.
10. The decoupled dual rotor alternating pole permanent magnet machine of claim 1, wherein: according to the application scene of the motor, the positions of the inner motor and the outer motor are adaptively changed.
CN202010025325.0A 2020-01-10 2020-01-10 Decoupling type birotor alternating pole permanent magnet motor Pending CN111082622A (en)

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CN202010025325.0A CN111082622A (en) 2020-01-10 2020-01-10 Decoupling type birotor alternating pole permanent magnet motor

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Application Number Priority Date Filing Date Title
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Cited By (3)

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WO2022148340A1 (en) * 2021-01-08 2022-07-14 上海鸣志电器股份有限公司 Double-rotor hybrid stepping motor
US20220320979A1 (en) * 2021-04-06 2022-10-06 Hamilton Sundstrand Corporation Electric motor with simplified winding and dual rotor

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Application publication date: 20200428