CN113708527A - Non-salient pole type electro-magnetic wound rotor and synchronous motor thereof - Google Patents
Non-salient pole type electro-magnetic wound rotor and synchronous motor thereof Download PDFInfo
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- CN113708527A CN113708527A CN202111024957.6A CN202111024957A CN113708527A CN 113708527 A CN113708527 A CN 113708527A CN 202111024957 A CN202111024957 A CN 202111024957A CN 113708527 A CN113708527 A CN 113708527A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/02—Synchronous motors
- H02K19/10—Synchronous motors for multi-phase current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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Abstract
The application relates to a non-salient pole type electro-magnetic wound rotor and a non-salient pole type electro-magnetic wound synchronous motor. The non-salient pole type electro-magnetic wound rotor comprises a rotor central rotating shaft and a rotor iron core which are arranged inside and outside; the rotor core is provided with a rotor air gap magnetic barrier for generating reluctance torque and a rotor excitation winding for generating direct-current excitation torque; the rotor excitation winding forms a plurality of non-salient pole type rotor direct current excitation magnetic poles. This application is through inside addition air gap magnetic barrier to introduce reluctance torque, the quadrature direct axis through reluctance torque and the quadrature direct axis of direct current excitation torque have corresponding electric angle, thereby improve the utilization ratio of non-salient pole formula electro-magnetic winding synchronous machine to two kinds of torque components. On the premise of not changing the size of the motor, the number of winding turns and the input condition, the output torque of the motor is improved, and the comprehensive performances such as the torque density, the efficiency and the like of the non-salient pole type electro-magnetic winding synchronous motor are further improved.
Description
Technical Field
The application relates to the technical field of electrically excited synchronous motors, in particular to a non-salient pole type electrically excited wound rotor and a non-salient pole type electrically excited wound synchronous motor.
Background
Permanent magnet materials are increasingly expensive, and exploitation of the permanent magnet materials inevitably brings about a serious problem of environmental pollution, so that development of high-performance motors with few or no permanent magnet materials is imperative. The electro-magnetic wound synchronous motor does not depend on permanent magnetic materials, is low in cost, and has the advantages of controllable rotor exciting current and good speed regulation performance.
The non-salient pole type electro-magnetic wound synchronous motor can be used for a synchronous motor and a synchronous generator. However, in actual production, because the energization winding exists on the rotor, extra copper loss is generated, efficiency is reduced, and heat dissipation is affected, so that the performance of the non-salient pole type electro-magnetic wound synchronous motor is still different from that of a permanent magnet synchronous motor in performance.
Disclosure of Invention
In order to solve the above technical problem or at least partially solve the above technical problem, the present application provides a non-salient pole type electrically excited wound rotor and a non-salient pole type electrically excited wound synchronous motor.
In a first aspect, the present application provides a non-salient pole type electrically excited wound rotor, which includes a rotor central rotating shaft and a rotor core that are arranged inside and outside; the rotor core is provided with a rotor air gap magnetic barrier for generating reluctance torque and a rotor excitation winding for generating direct-current excitation torque; the rotor excitation winding forms a plurality of non-salient pole type rotor direct current excitation magnetic poles.
Optionally, the number of the rotor air gap barriers is determined by the number of the non-salient pole rotor direct-current excitation magnetic poles.
Optionally, the position of the rotor air gap magnetic barrier is used for changing the coupling superposition relationship between the direct-current excitation torque of the direct-current excitation magnetic pole and the reluctance torque, so that the maximum value of the direct-current excitation torque and the maximum value of the reluctance torque can be superposed at a similar current phase angle.
Optionally, the rotor core is formed by laminating silicon steel sheets; and a rotor air gap magnetic barrier is arranged on the magnetic poles of the laminated silicon steel sheets.
Optionally, a preset angle exists between the center line of the rotor air gap magnetic barrier and the center line of the non-salient pole type rotor direct current excitation magnetic pole.
Optionally, the outer periphery of the rotor core has a plurality of winding slots for arranging rotor excitation windings; a tooth part is formed between the two adjacent winding slots; the tooth part is divided into a first tooth part and a second tooth part; wherein a first tooth portion and a second tooth portion are provided in each pole pitch; the first tooth is larger than the second tooth.
Optionally, no more than one third of the portion within each pole pitch constitutes the first tooth.
In a second aspect, the present application provides a non-salient pole electrically excited wound synchronous machine comprising a non-salient pole electrically excited wound rotor and a stator as described in any one of the above; the stator includes a stator core and a stator winding.
Optionally, a plurality of stator slots are arranged at equal intervals along the circumferential direction on the inner side of the stator core, and three-phase stator windings are arranged in the stator slots.
Optionally, an annular uniform air gap interval is formed between the stator core and the rotor core of the non-salient pole type electrically excited wound rotor.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
according to the embodiment of the application, the air gap magnetic barriers are added inside the non-salient pole type electro-magnetic wound synchronous motor, so that the magneto-resistive torque is introduced, and the corresponding electrical angle exists between the alternating-direct axis of the magneto-resistive torque and the alternating-direct axis of the direct-current excitation torque, so that the utilization rate of two torque components of the non-salient pole type electro-magnetic wound synchronous motor is improved. On the premise of not changing the size of the motor, the number of winding turns and the input condition, the output torque of the motor is improved, and the comprehensive performances such as the torque density, the efficiency and the like of the non-salient pole type electro-magnetic winding synchronous motor are further improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts. Wherein, the upper-coil is the current flowing direction, and the + is the current flowing direction.
Fig. 1 is a cross-sectional structural view of a 2-pole rotor marked with a winding current, which is perpendicular to a rotating shaft according to an embodiment of the present invention;
fig. 2 is a cross-sectional structure view of a 12-slot 2-high electromagnetic performance non-salient pole type electro-magnetic wound synchronous motor perpendicular to a rotating shaft according to an embodiment of the present application;
fig. 3 is a cross-sectional structure view of a 4-pole rotor marked with a winding current, which is perpendicular to a rotating shaft according to an embodiment of the present application;
fig. 4 is a cross-sectional structure view of a 12-slot 4-high electromagnetic performance non-salient pole type electro-magnetic wound synchronous motor provided in the embodiment of the present application, which is perpendicular to a rotating shaft;
fig. 5 is a torque characteristic curve diagram of a non-salient pole type electrically excited wound synchronous motor provided in the embodiment of the present application;
fig. 6 is a torque characteristic curve diagram of a conventional non-salient pole type electrically excited wound synchronous motor according to an embodiment of the present application.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.
Example one
The embodiment of the invention provides a non-salient pole type electric excitation wound rotor, which comprises a rotor central rotating shaft 3 and a rotor iron core 1, wherein the rotor central rotating shaft 3 and the rotor iron core 1 are arranged inside and outside as shown in figures 1-6; the rotor iron core 1 is provided with a rotor air gap magnetic barrier 5 for generating reluctance torque 10 and a rotor excitation winding 2 for generating direct-current excitation torque; the rotor excitation winding 2 forms a plurality of non-salient pole type rotor direct current excitation magnetic poles. The air gap magnetic barrier is mainly formed by a gap penetrating in the axial direction. Optionally, the number of the rotor air gap barriers is determined by the number of the non-salient pole rotor direct-current excitation magnetic poles.
According to the non-salient pole type electric excitation winding rotor provided by the embodiment of the invention, the air gap magnetic barriers are added in the non-salient pole type electric excitation winding rotor, so that the heat dissipation is easy, the reluctance torque is introduced, and the utilization rate of the non-salient pole type electric excitation winding synchronous motor to two torque components is improved through the corresponding electric angle between the alternating-direct axis of the reluctance torque and the alternating-direct axis of the direct current excitation torque. On the premise of not changing the size of the motor, the number of winding turns and the input condition, the output torque of the motor is improved, and the comprehensive performances such as the torque density, the efficiency and the like of the non-salient pole type electro-magnetic winding synchronous motor are further improved.
In some embodiments, the position of the rotor air gap magnetic barrier is used for determining an electrical angle between a direct-current axis and a direct-current axis of the reluctance torque, and the direct-current excitation torque of the direct-current excitation magnetic pole and the maximum value of the reluctance torque are superposed at a close current phase angle, that is, the maximum value of the direct-current excitation torque and the maximum value of the reluctance torque are superposed at a close current phase angle through the fact that the direct-current axis of the reluctance torque and the direct-current axis of the direct-current excitation torque have corresponding electrical angles, so that the utilization rate of the non-salient pole type electrically-excited wound synchronous motor on two torque components is improved. On the premise of not changing the size of the motor, the number of winding turns and the input condition, the output torque of the motor is improved, and the comprehensive performances such as the torque density, the efficiency and the like of the non-salient pole type electro-magnetic winding synchronous motor are further improved.
The following describes in detail embodiments of the present invention by way of specific embodiments.
As shown in fig. 1, the present embodiment provides a non-salient pole type electrically excited wound rotor (rotor for short) with 2 non-salient pole type rotor dc excited magnetic poles, which is applied to a non-salient pole type electrically excited wound synchronous motor (motor for short), wherein the rotor winding is fed with dc current to generate 2 rotor magnetic poles, the magnetic poles are perpendicular to the rotating shaft, and 2-pole double-layer air gap magnetic barriers are provided; the rotor comprises a rotor central rotating shaft 3, a rotor core 1 fixed on the rotor central rotating shaft 3, a winding coil 2 on the rotor core 1, and a rotor air gap magnetic barrier 5 on the rotor core. The periphery of the rotor core is provided with a plurality of winding slots for arranging rotor excitation windings; a tooth part is formed between the two adjacent winding slots; the tooth part is divided into a first tooth part (called as big tooth for short) and a second tooth part (called as small tooth for short); wherein a first tooth portion and a second tooth portion are provided in each pole pitch; the first tooth is larger than the second tooth. No more than one third of the portion within each pole pitch constitutes the first tooth. That is, each large tooth is a magnetic pole, forms a slot with a small tooth, and mounts a set of winding coils for generating rotor magnetomotive force. The rotor iron core is formed by laminating silicon steel sheets; and a rotor air gap magnetic barrier is arranged on the magnetic poles of the laminated silicon steel sheets. That is, the rotor core is formed by axially laminating cold rolled silicon steel sheets. A winding on the rotor iron core 1 is connected to a direct current power supply through an electric brush slip ring, and direct current generates rotor magnetomotive force through the winding.
The motor comprises the non-salient pole type electro-magnetic wound rotor, a stator iron core 7 and a stator winding 8, wherein the stator iron core 7 is formed by axially laminating cold-rolled silicon steel sheets. The stator winding 8 is constituted by a coil. The stator winding 8 is electrified with three-phase alternating current to generate stator rotating magnetomotive force.
Alternatively, a 12-slot 2-pole centralized winding structure can be adopted as shown in fig. 2, or a 12-slot 4-pole centralized winding structure can be adopted as shown in fig. 4, and each pole of the rotor adopts a double-layer (but not limited to double-layer) rotor air gap magnetic barrier, of course, the motor in the embodiment can also adopt a distributed winding by using 12-slot 2-pole or 4-pole double-layer rotor air gap magnetic barriers, and the number of stator slots, the number of rotor poles and the winding form of the coils can be changed.
Optionally, the rotor comprises a rotor fixing screw 4, a rotor excitation winding 2, a rotor core 1, a double-layer rotor air gap magnetic barrier 5 and a rotor central rotating shaft 3. The rotor center rotating shaft 3 is positioned in the center of the rotor, and two ends of the rotor center rotating shaft are fixed on the shell through bearings. The rotor core 1 is manufactured by axially laminating cold-rolled silicon steel sheets. The rotor core 1 is provided with 2 or 4 non-salient pole type rotor direct current excitation magnetic poles. And a coil is wound on each non-salient pole type rotor direct current excitation magnetic pole to form a rotor excitation winding 2.
Optionally, a preset angle exists between the center line of the rotor air gap magnetic barrier and the center line of the non-salient pole type rotor direct current excitation magnetic pole. That is, by adopting the way of embedding the rotor air gap magnetic barriers in the rotor core 1, the geometric center line of the magnetic pole formed by the embedded rotor air gap magnetic barriers 7 of each pole and the geometric center line of the hidden magnetic pole can have a certain angle deviation to form an asymmetric structure, and when the asymmetric structure is formed, the alternating-direct axis of the reluctance torque and the alternating-direct axis of the direct-current excitation torque have corresponding electrical angles, so that the maximum value of the direct-current excitation torque and the maximum value of the reluctance torque of the hidden-pole type electric excitation winding synchronous motor are superposed at a close current phase angle, and the utilization rate of the motor to two torque components is improved. On the premise of not changing the size of the motor, the number of turns of the winding and the input condition, the output torque of the motor is improved, and the comprehensive performances of the motor, such as torque density, efficiency and the like, are further improved. Of course, in some embodiments the embedded rotor air gap barrier 7 of each pole forms that the geometric centre line of the pole coincides with the geometric centre line of the hidden pole.
Alternatively, the rotor air gap barriers 5 may be filled with other non-magnetic materials, thereby improving its mechanical properties. The rotor air gap magnetic barriers 5 are embedded in the rotor core, so that the rotor structure presents different inductance characteristics in the quadrature axis direction and the direct axis direction, and the salient pole ratio is obtained. The salient pole ratio structure can bring reluctance torque 10, so that the total output torque 11 of the motor is the coupled superposition of direct-current excitation torque 9 and reluctance torque 10.
In the embodiment, the rotor air gap magnetic barrier 5 is positioned at the symmetrical axis position of the rotor big teeth. The electric angle of the phase difference between the current phase corresponding to the maximum value of the direct-current excitation torque 9 and the current phase corresponding to the maximum value of the reluctance torque 10 is changed by adjusting the positions of the air gap magnetic barriers and the center of the rotor big teeth, so that the output torque of the motor is improved, for example, the electric angle of the phase difference between the current phase corresponding to the maximum value of the direct-current excitation torque 9 and the current phase corresponding to the maximum value of the reluctance torque 10 is as small as possible, and the output torque 11 of the motor is improved.
That is, the present embodiment provides a non-salient pole type electrically excited wound rotor including: the direct-current excitation winding is arranged on the periphery of the rotor core along the circumferential direction, and is fastened by a metal slot wedge, so that the motor has a uniform air gap; one third of the part in each pole distance is not grooved to form a large tooth, the other part of the teeth are narrower and are called as small teeth, and the center of the large tooth is the center of the rotor direct-current excitation magnetic pole; in addition, an air gap magnetic barrier is arranged on the rotor core, and a certain angle can exist between the central line of the air gap magnetic barrier and the geometric central line of the rotor direct-current excitation magnetic pole. The rotor iron core is formed by laminating and processing cold-rolled silicon steel sheets with the thickness of 0.5 mm.
Another embodiment provides a non-salient pole type electrically excited wound stator, which is a high-performance non-salient pole type electrically excited synchronous motor constructed by a non-salient pole type electrically excited wound rotor, as shown in fig. 2 and 4, and the high-performance non-salient pole type electrically excited wound synchronous motor has a stator part and a rotor part inside a housing.
The stator part comprises a stator core 7 and a stator winding 8. The stator core 7 is formed by laminating cold-rolled silicon steel sheets in the axial direction of the rotor central rotating shaft 3. The stator core 7 is cylindrical and extends in the radial direction of the rotor center rotating shaft 3. The stator slots are arranged at equal intervals in the circumferential direction on the inner periphery of the stator. The present embodiment provides 12 stator slots while the three-phase stator winding 8 is provided in the stator slots. The three-phase stator winding 8 adopts centralized winding wiring, and approximately uniform annular air gap intervals are formed between the stator iron core 7 and the rotor iron core 1. Alternatively, a fixed number of stator slots in which three-phase stator windings are placed are provided at equal intervals in the circumferential direction on the inner periphery of the stator core.
Fig. 5 shows the relationship between the dc excitation torque 9 and the reluctance torque 10 with the change of the current phase angle when the high-performance non-salient pole type electro-magnetic wound synchronous motor operates normally, and the rotor air gap magnetic barrier in the rotor core can not only increase the reluctance torque component in the non-salient pole type electro-magnetic wound synchronous motor, but also change the position of the rotor air gap magnetic barrier in the rotor core, thereby changing the coupling and overlapping relationship between the dc excitation torque 9 and the reluctance torque 10 of the motor, so that the maximum value of the dc excitation torque 9 and the maximum value of the reluctance torque 10 can be overlapped at the close current phase angle, the torque component is fully utilized, and the total output electromagnetic torque 11.
In contrast, fig. 6 shows a torque characteristic graph of the conventional non-salient pole type electrically excited wound synchronous motor. In the figure, the reluctance torque 10 is zero, and the dc excitation torque 9 is the total output electromagnetic torque.
The rotor of the high-performance non-salient pole type electro-magnetic wound synchronous motor formed by the non-salient pole type electro-magnetic wound rotor increases the rotor air gap magnetic barrier on the basis of little or no influence on the direct current excitation torque, thereby increasing the reluctance torque, and simultaneously can rotate the position of the rotor air gap magnetic barrier around the rotor central rotating shaft 3, thereby realizing the superposition of the maximum value of the direct current excitation torque 9 and the maximum value of the reluctance torque 10 at the close current phase angle and fully utilizing the torque components. The motor not only has the characteristic of adjustable excitation, but also adds reluctance torque, and also has the characteristic of improving the utilization rate of each torque component of the motor. On the premise of not changing the size, materials and input conditions of the motor and not increasing other materials, the total output electromagnetic torque 11 of the motor is obviously improved, so that the overall performances of the motor, such as torque density, efficiency and the like, are further improved.
Example two
The embodiment of the invention provides a non-salient pole type electro-magnetic wound synchronous motor, which comprises a non-salient pole type electro-magnetic wound rotor and a non-salient pole type electro-magnetic wound stator, wherein the non-salient pole type electro-magnetic wound rotor comprises a plurality of salient pole types, and the plurality of salient pole types are connected with the non-salient pole type electro-magnetic wound rotor; the stator includes a stator core and a stator winding.
Optionally, a plurality of stator slots are arranged at equal intervals along the circumferential direction on the inner side of the stator core, and three-phase stator windings are arranged in the stator slots.
Optionally, an annular uniform air gap interval is formed between the stator core and the rotor core of the non-salient pole type electrically excited wound rotor.
In the specific implementation process of the embodiment of the invention, reference can be made to the first embodiment, and the corresponding technical effect is achieved.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A non-salient pole type electro-magnetic wound rotor is characterized in that the non-salient pole type electro-magnetic wound rotor comprises a rotor central rotating shaft and a rotor iron core which are arranged inside and outside; the rotor core is provided with a rotor air gap magnetic barrier for generating reluctance torque and a rotor excitation winding for generating direct-current excitation torque; the rotor excitation winding forms a plurality of non-salient pole type rotor direct current excitation magnetic poles.
2. The non-salient pole electrically-excited wound rotor as claimed in claim 1, wherein the number of the rotor air gap barriers is determined by the number of the non-salient pole rotor dc excitation magnetic poles.
3. The non-salient pole electrically-excited wound rotor as claimed in claim 1, wherein the position of the rotor air gap magnetic barrier is used for changing the coupling and superposition relationship of the direct-current excitation torque and the reluctance torque of the direct-current excitation magnetic pole, so that the maximum value of the direct-current excitation torque and the maximum value of the reluctance torque can be superposed at a similar current phase angle.
4. The non-salient pole type electrically excited wound rotor as claimed in claim 1, wherein the rotor core is laminated by silicon steel sheets; and a rotor air gap magnetic barrier is arranged on the magnetic poles of the laminated silicon steel sheets.
5. The non-salient pole electrically-excited wound rotor as claimed in claim 1, wherein a midline of the rotor air-gap magnetic barrier and a midline of the non-salient pole rotor DC excitation magnetic pole have a preset angle.
6. The non-salient pole electrically-excited wound rotor as claimed in claim 1, wherein the outer periphery of said rotor core has a plurality of winding slots for arranging rotor excitation windings; a tooth part is formed between the two adjacent winding slots; the tooth part is divided into a first tooth part and a second tooth part; wherein a first tooth portion and a second tooth portion are provided in each pole pitch; the first tooth is larger than the second tooth.
7. The non-salient pole electrically-excited wound rotor according to claim 6, wherein no more than one third of the portion within each pole pitch constitutes the first tooth portion.
8. A non-salient pole type electro-magnetic wound synchronous motor, characterized in that it comprises a non-salient pole type electro-magnetic wound rotor and a stator as claimed in any one of claims 1 to 7; the stator includes a stator core and a stator winding.
9. The non-salient pole electrically excited wound synchronous machine according to claim 8, wherein a plurality of stator slots are provided at equal intervals along a circumferential direction on an inner side of the stator core, and a three-phase stator winding is provided in the stator slots.
10. The field excitation wound synchronous machine of claim 8, wherein an annular uniform air gap spacing is formed between the stator core and the rotor core of the field excitation wound rotor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111024957.6A CN113708527B (en) | 2021-09-02 | 2021-09-02 | Non-salient pole type electro-magnetic wound rotor and synchronous motor thereof |
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| CN202111024957.6A CN113708527B (en) | 2021-09-02 | 2021-09-02 | Non-salient pole type electro-magnetic wound rotor and synchronous motor thereof |
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| CN113708527A true CN113708527A (en) | 2021-11-26 |
| CN113708527B CN113708527B (en) | 2022-09-20 |
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2021
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| CN113708527B (en) | 2022-09-20 |
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