CN112436703A - Double-rotor roller motor - Google Patents

Double-rotor roller motor Download PDF

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Publication number
CN112436703A
CN112436703A CN202011577352.5A CN202011577352A CN112436703A CN 112436703 A CN112436703 A CN 112436703A CN 202011577352 A CN202011577352 A CN 202011577352A CN 112436703 A CN112436703 A CN 112436703A
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CN
China
Prior art keywords
stator core
stator
rotor
circumferential groove
motor
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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
Application number
CN202011577352.5A
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Chinese (zh)
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CN112436703B (en
Inventor
孙明灿
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Shandong Hengji Group Co ltd
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Qilu University of Technology
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Priority to CN202011577352.5A priority Critical patent/CN112436703B/en
Publication of CN112436703A publication Critical patent/CN112436703A/en
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Publication of CN112436703B publication Critical patent/CN112436703B/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H02K16/02—Machines with one stator and two or more rotors
    • 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
    • H02K1/165—Shape, form or location of the slots
    • 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
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner 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
    • H02K1/278—Surface mounted magnets; Inset magnets
    • 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
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2786—Outer rotors
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

The invention belongs to the technical field of motors, and relates to a double-rotor roller motor which comprises a stator component, an inner rotor positioned in the stator component and an outer rotor positioned outside the stator component; the stator assembly comprises a first stator core and a second stator core which are distributed in the axial direction, wherein a first outer circumferential groove is formed in the outer side of the first stator core, a second outer circumferential groove is formed in the outer side of the second stator core, the first outer circumferential groove and the second outer circumferential groove are opposite to an outer rotor permanent magnet located on the inner wall of an outer rotor, a second inner circumferential groove is formed in the inner side of the second stator core, and the second inner circumferential groove is opposite to an inner rotor permanent magnet located on the outer wall of the inner rotor. The invention has the advantages that the structure that the inner rotor and the outer rotor are combined is adopted, and the torque density of the motor can be improved on the basis of not changing the outer diameter and the length of the motor.

Description

Double-rotor roller motor
Technical Field
The invention belongs to the technical field of motors, and relates to a dual-rotor roller motor.
Background
In the occasions needing belt conveyors, such as industrial and mining enterprises, vehicle and ship docks and the like, the traditional driving mode for the belt conveyors is that an asynchronous motor is matched with a speed reducer so as to realize low speed and large torque, but the driving mode has the defects of low efficiency, large maintenance workload and high operation cost. With the rapid development of the permanent magnet motor and the drive control thereof, the low-speed high-torque direct-drive permanent magnet motor is researched and developed and rapidly popularized, and gradually replaces the traditional asynchronous motor in the places of industrial mines, docks and the like, so that good effects of high efficiency, direct drive, energy conservation and the like of a drive system can be realized. The outer rotor low-speed high-torque permanent magnet roller direct drive motor can thoroughly realize the low-speed direct drive function of a single motor due to the fact that a connector part of the inner rotor permanent magnet direct drive motor and a belt conveyor is omitted, the structure of the whole drive system is remarkably simplified, and the efficiency and the reliability of the drive system can be further improved.
Meanwhile, with the development of the motor industry, the performance requirements of various industrial fields on the motor are higher and higher, so that the motor is promoted to be developed towards other high-performance directions such as high power density, and the like, and the low-speed roller motor is no exception. The roller motor is usually used for driving the belt conveyor to rotate in an industrial, mining and wharf to realize long-distance material conveying, the rotating speed is generally low, and the output torque is generally high, so that the roller motor is large in size and high in manufacturing and installation cost. Especially on long distance, heavy duty belt conveyors, which require the motor to provide more torque, however, providing more torque will result in larger motor drum sizes, which will increase manufacturing and installation costs. Therefore, how to increase the torque density of the motor to solve the contradiction between the larger torque requirement and the manufacturing and installation cost of the roller motor becomes a problem to be solved.
Disclosure of Invention
The double-rotor roller motor provided by the invention adopts a structure that the inner rotor and the outer rotor are combined, and can improve the torque density of the motor on the basis of not changing the outer diameter and the length of the motor.
The technical scheme of the invention comprises the following steps: the double-rotor drum motor comprises a stator component, an inner rotor positioned in the stator component and an outer rotor positioned outside the stator component;
the stator assembly comprises a first stator core and a second stator core which are distributed in the axial direction, wherein a first outer circumferential groove is formed in the outer side of the first stator core, a second outer circumferential groove is formed in the outer side of the second stator core, the first outer circumferential groove and the second outer circumferential groove are opposite to an outer rotor permanent magnet located on the inner wall of an outer rotor, a second inner circumferential groove is formed in the inner side of the second stator core, and the second inner circumferential groove is opposite to an inner rotor permanent magnet located on the outer wall of the inner rotor.
The technical scheme of the invention also comprises: the stator assembly comprises a stator core III which is axially positioned between the stator core I and the stator core II, an outer circumferential groove III is arranged on the outer side of the stator core III, and the outer circumferential groove III is opposite to an outer rotor permanent magnet positioned on the inner wall of the outer rotor.
The technical scheme of the invention also comprises: the first stator core is fixedly connected with the motor shaft through a stator support, the stator support is provided with first connecting holes at intervals along the circumferential direction, connecting pieces parallel to the axis of the motor shaft are installed in the first connecting holes, and the second stator core is provided with second connecting holes matched with the first connecting holes at intervals along the circumferential direction.
The technical scheme of the invention also comprises: the stator support is provided with lightening holes, the lightening holes are located on the inner side of the first connecting hole in the radial direction, and the first connecting hole and the second connecting hole are square holes.
The technical scheme of the invention also comprises: the first stator core is in interference fit with the stator support, and the inner diameter of the first stator core is the same as the outer diameter of the stator support.
The technical scheme of the invention also comprises: the inner diameter of the stator core III is smaller than that of the stator core I, and the inner diameter of the stator core III is equal to the diameter of the bottom of the inner circumferential groove II of the stator core II.
The technical scheme of the invention also comprises: and the axial length of the stator core III is greater than the winding length of the two end parts of the stator core.
The technical scheme of the invention also comprises: and the connecting piece is in interference fit with the first stator core, the second stator core and the third stator core.
The technical scheme of the invention also comprises: the inner rotor is in a cup shape and is fixedly connected with an end cover of the motor through a fastener.
The invention has the following beneficial effects: the inner rotor and the outer rotor are respectively positioned in the stator component through design, a double-rotor structure is formed, the torque density of the motor can be improved, the characteristic that the long diameter of the roller motor is larger is considered, the stator component is designed into a disconnected structure, the single-winding structure of partial stator components and the double-winding structure of partial stator components are realized, the installation of the stator components can be fixed, the mechanical strength and the power density of the whole motor are comprehensively improved, the torque density is improved, the manufacturing is not obviously improved, the requirement of the production process is met, and the manufacturing cost is not obviously increased.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Fig. 2 is a schematic view of an embodiment of a stator core assembly.
Fig. 3 is a schematic view of the installation of a first stator core and a third stator core in the embodiment.
Fig. 4 is a schematic view of the stator core mounting in the embodiment.
Figure 5 is a schematic view of a stator assembly in an embodiment.
Fig. 6 is a schematic view of a rotor assembly in an embodiment.
Wherein:
1. end cover, 11, inner rotor fixing bolt, 21, first stator core, 22, second stator core, 23, third stator core, 24, first outer circumferential groove, 25, second outer circumferential groove, 26, stator support, 27, lightening hole, 28, outer circumferential winding, 29, inner circumferential winding, 210, second inner circumferential groove, 211, third outer circumferential groove, 212, slot wedge, 3, square guide rod, 31, square guide rod threaded hole, 32, square guide rod bolt, 33, square guide rod bolt gasket, 4, rotor, 41, roller coating, 42, outer rotor core, 43, outer rotor permanent magnet, 44, inner rotor, 45, inner rotor permanent magnet, 46, fixing threaded hole, 5 and motor shaft.
Detailed Description
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In this document, terms such as "upper, lower, left, right, inner, and outer" are established based on the positional relationship shown in the drawings, and the corresponding positional relationship may vary depending on the drawings, and therefore, the terms are not to be construed as an absolute limitation of the protection scope; moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements. In the embodiments of the present invention, "above", "below", and the like include the present numbers.
As shown in fig. 1 to 6, the double-rotor drum motor of the present embodiment includes a stator assembly and a rotor assembly, wherein the rotor assembly includes an inner rotor 44 positioned inside the stator assembly and an outer rotor positioned outside the stator assembly.
Specifically, the rotor 4 comprises an outer rotor core 42, and a roller rubber 41 is wrapped on the outer side of the outer rotor core 42 and can be used for driving a belt of a belt conveyor. The outer rotor permanent magnet 43 is adhered to the inner wall of the outer rotor core 42 by magnetic steel adhesive, so that the outer rotor permanent magnet 43 faces the winding of the stator assembly installed therein, that is, the outer rotor permanent magnet 43 is opposite to the winding of the stator assembly.
Rotor 4 further comprises an inner rotor 44, specifically, inner rotor 44 is designed into a cup shape, a fixing threaded hole 46 is arranged at one end of inner rotor 44 facing end cover 1, and in cooperation, threaded holes identical to fixing threaded holes 46 in number, size and radial position are also arranged on end cover 1, and inner rotor 44 in a cup shape can be fixed on end cover 1 of the motor by using inner rotor fixing bolts 11 to pass through threaded holes and fixing threaded holes 46 during installation.
An inner rotor permanent magnet 45 is adhered to the outer wall of the inner rotor 44 by magnetic steel glue, so that the inner rotor permanent magnet 45 faces the winding of the stator assembly, that is, the inner rotor permanent magnet 45 is opposite to the winding of the stator assembly. And in the present embodiment, inner rotor 44 is designed to be opposite to a partial stator assembly in consideration of mechanical strength of the entire motor, that is, an axial length of inner rotor 44 is smaller than that of the stator assembly. As for the specific length of inner rotor 44, it can be determined according to the mechanical strength of the stator assembly and the torque density required by the motor, and the embodiment is not particularly limited thereto.
The stator assembly of the embodiment adopts a breaking type structure, so that the installation and fixation of the stator assembly and the mechanical strength of the whole drum motor are comprehensively improved. The stator comprises a first stator core 21 and a second stator core 22 which are distributed along the axial direction, wherein the first stator core 21 is only provided with an outer circumferential groove 24 on the outer side, namely the first stator core 21 is only provided with a groove with the outer diameter, the second stator core 22 is provided with grooves with the outer diameter and the inner diameter, namely the outer circumferential groove 25 is arranged on the outer side of the second stator core 22, and the inner circumferential groove 210 is arranged on the inner side of the second stator core 22. In this way, the outer circumferential groove one 24 of the stator core one 21 and the outer circumferential groove two 25 of the stator core two 22 may be opposed to the outer rotor permanent magnet 43 located at the inner wall of the outer rotor, and the inner circumferential groove two 210 of the stator core two 22 may be opposed to the inner rotor permanent magnet 45 located at the outer wall of the inner rotor 44.
In other modifications of the present embodiment, in order to provide a space for the winding end of the second stator core 22, a third stator core 23 may be provided between the first stator core 21 and the second stator core 22 in the axial direction, and the third stator core 23 may be slotted similar to the first stator core 21 except for being slotted in the outer diameter, that is, an outer circumferential groove three 211 may be provided on the outer side of the third stator core 23 and the third outer circumferential groove 211 may be opposed to the outer rotor permanent magnet 43 located on the inner wall of the outer rotor.
The first stator core 21 is fixed on the motor shaft 5 through a stator bracket 26, specifically, the axial lengths of the stator bracket 26 and the first stator core 21 are the same, and the first stator core 21 is fixed on the stator bracket 26 by interference fit. And, since the first stator core 21 has only the outer diameter slot, the inner diameter of the first stator core 21 is designed to be equal to the outer diameter of the stator bracket 26.
In addition, in order to fix the second stator core 22 and the third stator core 23 conveniently, the first stator bracket 26 is provided with connecting holes at intervals along the circumferential direction, connecting pieces parallel to the axis of the motor shaft 5 are installed in the first connecting holes, and in order to be installed in a matched mode, the second stator core 22 and the third stator core 23 are also provided with second connecting holes and third connecting holes matched with the first connecting holes at intervals along the circumferential direction. Specifically, the connecting piece can adopt the structure of square guide bar 3, and matched with, connecting hole one, connecting hole two and connecting hole three all design for the square hole.
During installation, the square guide rod 3 is installed in the square hole of the stator bracket 26, and the square guide rod 3 respectively penetrates through the square holes of the stator core three 23 and the stator core two 22 to reach the other end of the stator assembly. The square guide rod 3 is provided with square guide rod threaded holes 31 at two ends, after the stator core III 23 and the stator core II 22 are installed, square guide rod bolts 32 are placed into the square guide rod threaded holes 31 at two ends of the square guide rod 3 to be screwed, square guide rod bolt gaskets 33 can be installed between the square guide rod bolts 32 and the square guide rod 3, and particularly, the size of each square guide rod bolt gasket 33 is determined by covering the end faces of two axial sides of the square guide rod 3.
In this embodiment, the cross-sectional dimension of the square guide rod 3 may be designed to be the same as the dimensions of the square holes formed in the stator bracket 26, the second stator core 22, and the third stator core 23, that is, the square guide rod 3, the stator bracket 26, the second stator core 22, and the third stator core 23 are fixed by interference fit, and are fastened into a whole by using the square guide rod bolt 32 after the interference fit.
As shown in fig. 2, the stator holder 26 is provided with lightening holes 27, and the lightening holes 27 are located inside the first coupling holes for mounting the square guide bar 3 in the radial direction. The first stator core 21 is in interference fit with the stator support 26, and the inner diameter of the first stator core 21 is the same as the outer diameter of the stator support 26.
As shown in fig. 3 and 4, the inner diameter of the stator core three 23 is smaller than the inner diameter of the stator core one 21, and the inner diameter of the stator core three 23 is equal to the groove bottom diameter of the inner circumferential groove two 210 of the stator core two 22. And the axial length of the stator core three 23 is larger than the winding length of the end part of the stator core two 22, so as to provide an axial extending space for the winding end part of the stator core two 22. The inner diameter of the stator core three 23 is equal to the diameter of the inner circumference slot two 210 of the stator core two 22 corresponding to the slot bottom, so that a space is provided for the winding end part of the inner diameter of the stator core two 22. Further, the outer circumferential grooves one 24 of the stator core one 21, the outer circumferential grooves two 25 of the stator core two 22, and the outer circumferential grooves three 211 of the stator core three 23 are the same in type, size, position, and number, and are aligned in the axial direction.
The number of the second inner circumferential slots 210 of the second stator core 22 is equal to the number of the second outer circumferential slots 25, and the areas of the second inner circumferential slots and the second outer circumferential slots are equal. Further, the axial length of the second stator core 22 is designed to be the same as the axial length of the inner rotor permanent magnet 45.
In the embodiment of the invention, thread glue is coated on the thread at the thread connecting positions of the stator assembly, the rotor assembly and the like, for example, the thread fixing position of the connection between the inner rotor 44 and the end cover 1 and the like, so as to avoid the loosening of the connecting thread.
In the dual-rotor roller motor of the embodiment, when the frequency converter supplies power to the motor, the outer rotor and the inner rotor 44 simultaneously drive the roller to rotate, and mechanical torque is output outwards, so that the torque density of the motor can be improved; meanwhile, the stator assembly adopts a breaking type structure, so that the mechanical strength of the drum motor can be improved even under the condition that the long diameter of the drum motor is larger, the requirements of manufacturing and production processes are not obviously improved, and the manufacturing cost is not obviously increased.
In the case that the embodiments are not contradictory, at least some of the technical solutions in the embodiments may be recombined to form the essential technical solution of the present invention, and of course, the embodiments may also be cited or included in each other. Further, it should be noted that modifications and adaptations made by those skilled in the art when recombining technical means described in the respective embodiments will also fall within the scope of the present invention.
The technical principles of the present invention have been described above in connection with specific embodiments, but it should be noted that the above descriptions are only for the purpose of explaining the principles of the present invention, and should not be construed as specifically limiting the scope of the present invention in any way. Based on the explanations herein, those skilled in the art will appreciate that other embodiments of the present invention or equivalents thereof without inventive step, are also within the scope of the present invention.

Claims (9)

1. A kind of birotor cylinder electrical machinery, characterized by that: the rotor comprises a stator component, an inner rotor positioned in the stator component and an outer rotor positioned outside the stator component;
the stator assembly comprises a first stator core and a second stator core which are distributed in the axial direction, wherein a first outer circumferential groove is formed in the outer side of the first stator core, a second outer circumferential groove is formed in the outer side of the second stator core, the first outer circumferential groove and the second outer circumferential groove are opposite to an outer rotor permanent magnet located on the inner wall of an outer rotor, a second inner circumferential groove is formed in the inner side of the second stator core, and the second inner circumferential groove is opposite to an inner rotor permanent magnet located on the outer wall of the inner rotor.
2. The dual rotor drum motor of claim 1, wherein: the stator assembly comprises a stator core III which is axially positioned between the stator core I and the stator core II, an outer circumferential groove III is arranged on the outer side of the stator core III, and the outer circumferential groove III is opposite to an outer rotor permanent magnet positioned on the inner wall of the outer rotor.
3. The double-rotor drum motor according to claim 1 or 2, wherein: the first stator core is fixedly connected with the motor shaft through a stator support, the stator support is provided with first connecting holes at intervals along the circumferential direction, connecting pieces parallel to the axis of the motor shaft are installed in the first connecting holes, and the second stator core is provided with second connecting holes matched with the first connecting holes at intervals along the circumferential direction.
4. The dual rotor drum motor of claim 3, wherein: the stator support is provided with lightening holes, the lightening holes are located on the inner side of the first connecting hole in the radial direction, and the first connecting hole and the second connecting hole are square holes.
5. The dual rotor drum motor of claim 3, wherein: the first stator core is in interference fit with the stator support, and the inner diameter of the first stator core is the same as the outer diameter of the stator support.
6. The dual rotor drum motor of claim 2, wherein: the inner diameter of the stator core III is smaller than that of the stator core I, and the inner diameter of the stator core III is equal to the diameter of the bottom of the inner circumferential groove II of the stator core II.
7. The dual rotor drum motor of claim 2, wherein: and the axial length of the stator core III is greater than the winding length of the two end parts of the stator core.
8. The dual rotor drum motor of claim 3, wherein: and the connecting piece is in interference fit with the first stator core, the second stator core and the third stator core.
9. The dual rotor drum motor of claim 1, wherein: the inner rotor is in a cup shape and is fixedly connected with an end cover of the motor through a fastener.
CN202011577352.5A 2020-12-28 2020-12-28 Double-rotor roller motor Active CN112436703B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011577352.5A CN112436703B (en) 2020-12-28 2020-12-28 Double-rotor roller motor

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Application Number Priority Date Filing Date Title
CN202011577352.5A CN112436703B (en) 2020-12-28 2020-12-28 Double-rotor roller motor

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CN112436703A true CN112436703A (en) 2021-03-02
CN112436703B CN112436703B (en) 2022-07-01

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007274749A (en) * 2006-03-30 2007-10-18 Toyota Motor Corp Stator, motor and method for manufacturing stator
KR20130051971A (en) * 2013-04-26 2013-05-21 주식회사 아모텍 Divisional core type motor
JP2014082804A (en) * 2012-10-12 2014-05-08 Fanuc Ltd Electric motor with stator and rotor
JP2016146739A (en) * 2015-02-03 2016-08-12 東芝産業機器システム株式会社 Laminated core and manufacturing method of same
CN107017746A (en) * 2017-05-17 2017-08-04 北京佳宇康华科技有限公司 Dual rotor permanent magnetic motor
CN110676998A (en) * 2019-08-30 2020-01-10 北斗航天汽车（北京）有限公司 Dual-rotor motor structure
CN111490656A (en) * 2020-04-20 2020-08-04 中国北方车辆研究所 Novel motor structure

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007274749A (en) * 2006-03-30 2007-10-18 Toyota Motor Corp Stator, motor and method for manufacturing stator
JP2014082804A (en) * 2012-10-12 2014-05-08 Fanuc Ltd Electric motor with stator and rotor
KR20130051971A (en) * 2013-04-26 2013-05-21 주식회사 아모텍 Divisional core type motor
JP2016146739A (en) * 2015-02-03 2016-08-12 東芝産業機器システム株式会社 Laminated core and manufacturing method of same
CN107017746A (en) * 2017-05-17 2017-08-04 北京佳宇康华科技有限公司 Dual rotor permanent magnetic motor
CN110676998A (en) * 2019-08-30 2020-01-10 北斗航天汽车（北京）有限公司 Dual-rotor motor structure
CN111490656A (en) * 2020-04-20 2020-08-04 中国北方车辆研究所 Novel motor structure

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