CN106533106A - Permanent magnet motor and electric tool using same - Google Patents

Permanent magnet motor and electric tool using same Download PDF

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Publication number
CN106533106A
CN106533106A CN201610416278.6A CN201610416278A CN106533106A CN 106533106 A CN106533106 A CN 106533106A CN 201610416278 A CN201610416278 A CN 201610416278A CN 106533106 A CN106533106 A CN 106533106A
Authority
CN
China
Prior art keywords
magnetic core
magnetic
magneto
permanent magnet
equal
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
CN201610416278.6A
Other languages
Chinese (zh)
Inventor
李越
周垂有
潘广业
罗尼·科尔
王勇
朱晓宁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Johnson Electric Shenzhen Co Ltd
Original Assignee
Johnson Electric Shenzhen Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from CN201510580299 external-priority
Application filed by Johnson Electric Shenzhen Co Ltd filed Critical Johnson Electric Shenzhen Co Ltd
Priority to DE102016116883.1A priority Critical patent/DE102016116883A1/en
Priority to US15/260,772 priority patent/US20170077773A1/en
Publication of CN106533106A publication Critical patent/CN106533106A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K21/00Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/22Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
    • 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
    • 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
    • H02K1/276Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H02K1/2766Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
    • H02K1/2773Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets
    • 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
    • H02K2213/03Machines characterised by numerical values, ranges, mathematical expressions or similar information

Abstract

The invention provides a permanent magnet motor and an electric tool using the same. The permanent magnet motor comprises a stator and a rotor which can mounted to the stator in a rotatable manner, wherein one of the stator and the rotor comprises an annular first magnetic core and a plurality of permanent magnets embedded in the first magnetic core, and the plurality of permanent magnets are distributed along the circumferential direction of the first magnetic core, so that a plurality of magnetic poles with alternately distributed polarities are formed on the inner circumferential surface of the first magnetic core; the other of the stator and the rotor comprises a second magnetic core and a winding, the second magnetic core is accommodated in the first magnetic core and comprises a plurality of teeth extending towards the first magnetic core, and the winding is wound on the teeth; and the first magnetic core can serve as the motor rotor, and the second magnetic core can serve as the motor stator. By embedding the permanent magnets into the magnetic core, the permanent magnets are prevented from falling off; and the permanent magnets and the magnetic core form more intensive magnetic poles after mutual induction, thereby improving power density. The permanent magnet motor is suitable for a wide range of application environments, including but not limited to electric saws.

Description

A kind of magneto and the electric tool using the motor
Technical field
The present invention relates to motor, more particularly, to a kind of magneto, the magneto is particularly suited for the electricity such as electric saw In power driven tools.
Background technology
Traditional magneto includes stator and rotor.Stator includes the shell of annular, is installed to shell inner peripheral surface Some permanent magnets, the end cap for being installed to shell shaft end.Rotor includes rotating shaft, the rotor core for being fixed to rotating shaft, coiling to rotor Winding on the tooth of iron core.The end cap of stator installs bearing to be used for supporting the rotating shaft of rotor, rotor is turned relative to stator It is dynamic.One of the conventional motors has the disadvantage that power density is low, and permanent magnet is possible to come off so as to cause electrical fault.Additionally, using Family also wants to motor with bigger power density.
The content of the invention
For overcoming the shortcoming of prior art, one aspect of the present invention to provide a kind of magneto and be provided with the permanent magnetism The electric tool of motor, the magneto include stator and are pivotally mounted to the rotor of stator.The stator and rotor One of which some permanent magnets for including in the first magnetic core of annular, embedded first magnetic core, some permanent magnets are along described Circumferentially distributed, some magnetic poles for arranging the first magnetic core inner peripheral surface formation alternating polarity of the first magnetic core.The stator Include the second magnetic core and winding with the another one of rotor, second magnetic core is contained in first magnetic core and with towards first Some teeth that magnetic core stretches out, the winding technique is in the tooth.
Magneto that the present invention is provided, permanent magnet is embedded in magnetic core, it is to avoid permanent magnet comes off.Also, permanent magnet Higher magnetic pole is formed after being sensed with magnetic core mutually, so as to improve power density.This kind of magneto is suitable for various electronic Instrument, including but not limited to electric saw.
In order to be able to be further understood that feature and the technology contents of the present invention, refer to below in connection with the detailed of the present invention Illustrate and accompanying drawing, but institute's accompanying drawing only provides with reference to and illustrates to use, not for being any limitation as to the present invention.
Description of the drawings
Fig. 1 is a kind of structured flowchart of electric tool that the present invention is provided;
Fig. 2 is the schematic cross-section of the magneto that the first embodiment of magneto of the present invention is provided;
Fig. 3 is the schematic cross-section of the magneto that the second embodiment of magneto of the present invention is provided.
Fig. 4 is the schematic partial cross-sectional view of the magneto that the 3rd embodiment of magneto of the present invention is provided.
Fig. 5 is a kind of schematic diagram of mode that magneto of the present invention realizes non-homogeneous air gap.
Fig. 6 is the schematic diagram of the another way that magneto of the present invention realizes non-homogeneous air gap.
Specific embodiment
With reference to Fig. 1, the electric tool that the present invention is provided is an electric saw, and which includes magneto 20 and saw blade 10, Permanent Magnet and Electric Machine 20 drives saw blade 10 to move by actuating device such as deceleration device (not shown) etc..Because the present invention's is mainly improved by electricity Machine, electric saw can adopt traditional electric saw, therefore the present invention no longer describes the concrete structure of electric saw.
With reference to Fig. 2, in the first embodiment of magneto of the present invention, magneto 20 includes excitation part 30 and armature Part 50.Excitation division point includes annular first magnetic core 31 and some permanent magnets 35 in motor axially embedded first magnetic core 31. Armature portion 50 includes the second magnetic core 53.Second magnetic core 53 is provided with some teeth 55.Each tooth 55 is included for for winding winding Tooth body and it is arranged on the pole shoe of tooth body end.Second magnetic core 53 is contained in the first magnetic core 31.
If the first magnetic core 31 can be formed along motor is axially stacked by dried layer stalloy, every layer of stalloy is designed with permanent magnet peace Dress hole 33, in order to insert for permanent magnet 35 after stacked.Preferably, each permanent magnet 35 is circular arc, the circular arc Opening is towards the second magnetic core 53.It is to be appreciated that each permanent magnet 35 can also be tabular, can be uniform thickness or non- Uniform thickness, in order to be fitted to the first magnetic core 31.Permanent magnet 35 is fitted to inside magnetic core, can avoid or reduce permanent magnet 35 The risk for coming off.
In the first embodiment, each permanent magnet 35 polarizes along its thickness direction.In the present embodiment, every block of permanent magnetism Body 35 is correspondingly formed a magnetic pole, the opposite polarity of adjacent permanent magnetic poles.Circumference point of some permanent magnets 35 along the first magnetic core 31 Cloth, and the polarity of 35 inner surface of permanent magnet is alternately arranged along the circumference of the first magnetic core 31 in N poles, S poles, so as in the first magnetic core 31 inner peripheral surface forms some N poles being alternately arranged, S poles.It is to be appreciated that in other embodiments, each permanent-magnet pole Can be made up of polylith permanent magnet.During using embedded structure, motor excitation part 50 can adopt larger sized permanent magnet, So as to increase the power density of motor, it is possible to increase the effectiveness of performance of motor.
The quantity for differring primarily in that permanent magnet 35 of the magneto provided with reference to Fig. 3, second embodiment of the invention, shape Shape, arrangement position.Specifically, 35 quantity of permanent magnet being embedded in the first magnetic core 31 is equal to and is formed at 31 inner peripheral surface of the first magnetic core 2 times of number of magnetic poles, form a magnetic pole per 2 permanent magnets in 31 inner peripheral surface of the first magnetic core, two permanent magnets surround V Shape, the angle theta of V-arrangement are less than or equal to 170 ° more than or equal to 90 °.The second magnetic core 53 of the V-arrangement opening direction, and two permanent magnets There is identical polarity towards the surface of the second magnetic core 53 such that it is able in will be the first magnetic core 31 corresponding with the V-arrangement opening Perimeter surface is magnetized into a magnetic pole.The magnetic pole of excitation part is arranged such, with poly- magnetic effect.In order to reach preferably poly- magnetic effect Fruit rationally utilization space, raising power density are low, and the scope of angle theta is more preferably 120 °≤θ≤170 °, more preferably 120°≤θ≤150°。
Apply in example second, each permanent magnet 35 is tabular.It is to be appreciated that permanent magnet 35 can also be arc, or The thin ellipse in person's thick middle two ends.
In a second embodiment, the inner peripheral surface per 2 permanent magnets 35 in the first magnetic core 31 forms a magnetic pole;Can manage Xie Di, in other embodiments, each magnetic pole can be formed by 3 or greater number of permanent magnet.Therefore, it is embedded in the first magnetic core 35 quantity of permanent magnet in 31 is equal to n times of the number of magnetic poles for being formed at 31 inner peripheral surface of the first magnetic core, and n is the integer more than 0.
Referring to Fig. 2 and 3, in above-mentioned first and second embodiment, the inner surface of the first magnetic core 31 is in per adjacent magnetic pole Between form a groove 37, and form magnetic bridge 38 in corresponding groove 37 so that these magnetic bridges 38 are circumferentially distributed along motor, and often Individual magnetic bridge 38 is located between corresponding two adjacent poles.Magnetic bridge 38 has very big magnetic resistance, and magnetic flux can be reduced or avoided from this Place passes through, and promotes the magnetic flux that permanent magnet is produced to enter the second magnetic core 51 as much as possible via the first magnetic core 31, so as to further change Kind motor performance.
In first and second embodiment, the radial depth of groove 37 accounts for the 1/3 or so of the radial thickness of the first magnetic core 31. It is to be appreciated that the radial depth of groove 37 as needed, can be arranged on the 1/5 to 2/3 of the radial thickness of the first magnetic core 31 Scope.
In first and second embodiment, groove 37 is along the axially consecutive extension of motor.Alternatively, groove 37 is along motor axial direction It is discontinuous, i.e. a magnetic bridge is formed along the axially spaced groove of motor by some sections.
Preferably, in the inner peripheral surface of the first magnetic core 31, the region beyond magnetic bridge is all located on same circumference, changes speech It, the inner surface of the magnetic pole of the first magnetic core 31 is all located on same periphery, thus, the air gap between magnetic pole of the stator and rotor Thickness is uniform, and such electric machine structure is simple, is easy to processing.
As shown in figure 4, in the third embodiment, the pole shoe of the inner peripheral surface of first magnetic core 31 and the second magnetic core 53 Between can also form non-homogeneous air gap, wherein maximum air gap thickness AmaxWith minimal air gap thickness AminRatio be less than or equal to 4. Cogging torque can be effectively reduced using non-homogeneous air gap, the purpose of running noise of motor is reduced.It is appreciated that to electricity Machine has two-way startup ability, can form symmetrical non-homogeneous air gap, i.e., when the magnetic of the pole shoe and the first magnetic core 31 of the second magnetic core 53 Extremely to timing, the air gap is symmetrical with regard to the centrage of the magnetic pole, and the centrage refers to that the circumferential midpoint of the magnetic pole and motor revolve Turn the line between center.Contrary, if desired motor has unilateral initiative ability, can form asymmetric non-homogeneous air gap.
As shown in figure 5, a kind of mode that the non-homogeneous gas of formation is attacked is the correspondence on the periphery of the inner side of the first magnetic core 31 One end of each magnetic pole or two ends form cutting plane.One is formed between the cutting plane and the centrage of corresponding magnetic pole Angle β, the scope of the angle β are to be less than or equal to 100 ° more than or equal to 60 °, are preferably greater than less than or equal to equal to 70 ° 90°。
As shown in fig. 6, a kind of mode that the non-homogeneous gas of formation is attacked is the one of the outside of each pole shoe in the second magnetic core 53 End or two ends form cutting face.The cutting face can be cambered surface S2, and it is S1 that the middle part on the outside of pole shoe is cambered surface.Cambered surface S1 and arc Face S2 is tangent and the curvature of cambered surface S1 less than cambered surface S1 curvature.
In above-described embodiment, motor is external-rotor-type brushless electric machine, the first magnetic core 31 and permanent magnet 33 turning as motor The stator of son, the second magnetic core 53 and winding thereon as motor.It is to be appreciated that the first magnetic core 31 and permanent magnet 33 can also Stator as motor, and the second magnetic core 53 and winding thereon are also used as the rotor of motor.Now, the motor is interior turn In the present embodiment, the armature winding can connect into three-phase windings so as to form three phase electric machine to sub-motor.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.

Claims (21)

1. a kind of magneto, including stator and the rotor for being pivotally mounted to stator, it is characterised in that:
The one of which of the stator and rotor includes some permanent magnets in the first magnetic core of annular, embedded first magnetic core, institute Some permanent magnets are stated along the circumferentially distributed of first magnetic core, makes the first magnetic core inner peripheral surface form alternating polarity arrangement Some magnetic poles;
The another one of the stator and rotor includes the second magnetic core and winding, and second magnetic core is contained in first magnetic core And with some teeth stretched out towards the first magnetic core, the winding technique is on the tooth.
2. magneto as claimed in claim 1, it is characterised in that first magnetic core and permanent magnet are used as rotor, described Second magnetic core and winding are used as stator.
3. magneto as claimed in claim 1, it is characterised in that first magnetic core forms some magnetic bridges, described some Magnetic bridge is circumferentially distributed along motor, and each magnetic bridge is located between corresponding two adjacent poles.
4. magneto as claimed in claim 3, it is characterised in that first magnetic core is corresponding to forming recessed at each magnetic bridge Groove.
5. magneto as claimed in claim 4, it is characterised in that the groove forms the interior table with first magnetic core Face, the radial depth of each groove are less than or equal to 2/3 with the ratio of the radial thickness of first magnetic core more than or equal to 0.
6. magneto as claimed in claim 1, it is characterised in that the inner surface of some magnetic poles is located at same circumference On face.
7. magneto as claimed in claim 1, it is characterised in that the permanent magnet quantity being embedded in first magnetic core is equal to The quantity of the magnetic pole of the first magnetic core inner peripheral surface is formed at, each permanent magnet forms one in the first magnetic core inner peripheral surface Individual magnetic pole.
8. magneto as claimed in claim 7, it is characterised in that each permanent magnet is circular arc, the opening of the circular arc Towards the second magnetic core.
9. magneto as claimed in claim 1, it is characterised in that the permanent magnet quantity being embedded in first magnetic core is equal to N times of number of magnetic poles of the first magnetic core inner peripheral surface is formed at, wherein n is the integer more than 1;Per n permanent magnet in institute State the first magnetic core inner peripheral surface and form a magnetic pole.
10. magneto as claimed in claim 9, it is characterised in that each permanent magnet is tabular, arc or thick middle The thin ellipse in two ends.
11. magnetoes as claimed in claim 10, it is characterised in that per 2 permanent magnets in first magnetic core weekly form Face forms a magnetic pole, and two permanent magnets surround V-arrangement, and the V-arrangement opening is more than or equal to towards the second magnetic core, the angle theta of V-arrangement 90 ° are less than or equal to 170 °.
12. magnetoes as claimed in claim 11, it is characterised in that the scope of angle theta is 120 °≤θ≤170 °.
13. magnetoes as claimed in claim 12, it is characterised in that the scope of angle theta is 120 °≤θ≤150 °.
14. magnetoes as claimed in claim 1, it is characterised in that the first magnetic core inner peripheral surface and the second magnetic core Non-homogeneous air gap, wherein maximum air gap thickness A is formed between outer surfacemaxWith minimal air gap thickness AminRatio be less than or equal to 4。
15. magnetoes as claimed in claim 14, it is characterised in that the air gap with regard to the centrage of magnetic pole it is symmetrical or It is asymmetric.
16. magnetoes as claimed in claim 14, it is characterised in that correspondence on the periphery of the inner side of first magnetic core One end of each magnetic pole or two ends form cutting face, form one and press from both sides between the cutting plane and the centrage of corresponding magnetic pole Angle beta, the scope of the angle β are to be less than or equal to 100 ° more than or equal to 60 °.
17. magnetoes as claimed in claim 16, it is characterised in that the scope of the angle β is little more than or equal to 70 ° In equal to 90 °.
18. magnetoes as claimed in claim 14, it is characterised in that the one end in the outside of each pole shoe of the second magnetic core or Person two ends form cutting face.
19. magnetoes as claimed in claim 18, it is characterised in that the cutting face be cambered surface S2, on the outside of pole shoe in It is S1 that portion is cambered surface, cambered surface S1 and cambered surface S2 be tangent and the curvature of cambered surface S1 less than cambered surface S1 curvature.
20. a kind of electric tools, it is characterised in that include the magneto as described in any one in claim 1 to 19.
21. electric tools as claimed in claim 20, it is characterised in that the electric tool is electric saw, including saw blade, described Motor is used for driving the saw blade.
CN201610416278.6A 2015-09-11 2016-06-13 Permanent magnet motor and electric tool using same Pending CN106533106A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE102016116883.1A DE102016116883A1 (en) 2015-09-11 2016-09-08 Permanent magnet motor and power tool using the same
US15/260,772 US20170077773A1 (en) 2015-09-11 2016-09-09 Permanent magnet motor and power tool using same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201510580299 2015-09-11
CN2015105802997 2015-09-11

Publications (1)

Publication Number Publication Date
CN106533106A true CN106533106A (en) 2017-03-22

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Family Applications (1)

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CN201610416278.6A Pending CN106533106A (en) 2015-09-11 2016-06-13 Permanent magnet motor and electric tool using same

Country Status (1)

Country Link
CN (1) CN106533106A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109104014A (en) * 2018-09-21 2018-12-28 江苏大学 A kind of four phase double winding vernier motors
CN109412294A (en) * 2018-10-31 2019-03-01 山东理工大学 A kind of permanent magnet synchronous motor of electric car Asymmetric V-type magnet steel
CN110114960A (en) * 2017-03-24 2019-08-09 宝马股份公司 Pole shoe, motor and the vehicles

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1169051A (en) * 1996-03-31 1997-12-31 三洋电机株式会社 Permanent magnet stator of motor
TW382160B (en) * 1997-04-02 2000-02-11 Ind Tech Res Inst Brush-less motor stator and arc modification method thereof
JP2002010602A (en) * 2000-06-19 2002-01-11 Toshiba Digital Media Engineering Corp Permanent magnet motor and elevator
JP2002233122A (en) * 2001-02-05 2002-08-16 Matsushita Electric Ind Co Ltd Outer rotor motor, manufacturing method of the motor, and electric vehicle mounting the motor
CN1790870A (en) * 2004-11-25 2006-06-21 株式会社东芝 Permanent magnet motor and washing machine provided therewith
US20070252465A1 (en) * 2006-04-27 2007-11-01 Kokusan Denki Co., Ltd. Outer-rotor-type magneto generator
CN101917076A (en) * 2010-08-26 2010-12-15 苏州工业园区和鑫电器有限公司 Permanent magnet drive motor for solar tracking system
CN102624180A (en) * 2012-04-16 2012-08-01 华域汽车电动系统有限公司 Concentrated-winding permanent-magnetic synchronous motor

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1169051A (en) * 1996-03-31 1997-12-31 三洋电机株式会社 Permanent magnet stator of motor
TW382160B (en) * 1997-04-02 2000-02-11 Ind Tech Res Inst Brush-less motor stator and arc modification method thereof
JP2002010602A (en) * 2000-06-19 2002-01-11 Toshiba Digital Media Engineering Corp Permanent magnet motor and elevator
JP2002233122A (en) * 2001-02-05 2002-08-16 Matsushita Electric Ind Co Ltd Outer rotor motor, manufacturing method of the motor, and electric vehicle mounting the motor
CN1790870A (en) * 2004-11-25 2006-06-21 株式会社东芝 Permanent magnet motor and washing machine provided therewith
US20070252465A1 (en) * 2006-04-27 2007-11-01 Kokusan Denki Co., Ltd. Outer-rotor-type magneto generator
CN101917076A (en) * 2010-08-26 2010-12-15 苏州工业园区和鑫电器有限公司 Permanent magnet drive motor for solar tracking system
CN102624180A (en) * 2012-04-16 2012-08-01 华域汽车电动系统有限公司 Concentrated-winding permanent-magnetic synchronous motor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110114960A (en) * 2017-03-24 2019-08-09 宝马股份公司 Pole shoe, motor and the vehicles
US11374446B2 (en) 2017-03-24 2022-06-28 Bayerische Motoren Werke Aktiengesellschaft Pole shoe, electric motor, and vehicle
CN109104014A (en) * 2018-09-21 2018-12-28 江苏大学 A kind of four phase double winding vernier motors
CN109104014B (en) * 2018-09-21 2020-06-26 江苏大学 Four-phase double-winding vernier motor
CN109412294A (en) * 2018-10-31 2019-03-01 山东理工大学 A kind of permanent magnet synchronous motor of electric car Asymmetric V-type magnet steel
CN109412294B (en) * 2018-10-31 2021-06-29 山东理工大学 Permanent magnet synchronous motor of asymmetric V-shaped magnetic steel of electric automobile

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Application publication date: 20170322