CN110460185A - Rotor and motor - Google Patents

Rotor and motor Download PDF

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Publication number
CN110460185A
CN110460185A CN201910865509.5A CN201910865509A CN110460185A CN 110460185 A CN110460185 A CN 110460185A CN 201910865509 A CN201910865509 A CN 201910865509A CN 110460185 A CN110460185 A CN 110460185A
Authority
CN
China
Prior art keywords
permanent magnet
rotor
magnetic
motor
permanent
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
CN201910865509.5A
Other languages
Chinese (zh)
Inventor
朱晓光
陈华杰
周博
张辉
徐培荣
刘进超
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.)
Zhuhai Gree Energy Saving Environmental Protection Refrigeration Technology Research Center Co Ltd
Original Assignee
Zhuhai Gree Energy Saving Environmental Protection Refrigeration Technology Research Center 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
Application filed by Zhuhai Gree Energy Saving Environmental Protection Refrigeration Technology Research Center Co Ltd filed Critical Zhuhai Gree Energy Saving Environmental Protection Refrigeration Technology Research Center Co Ltd
Priority to CN201910865509.5A priority Critical patent/CN110460185A/en
Publication of CN110460185A publication Critical patent/CN110460185A/en
Pending legal-status Critical Current

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Classifications

    • 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 rotor
    • H02K1/272Inner rotor where the magnetisation axis of the magnets is radial or tangential
    • H02K1/274Inner rotor where the magnetisation axis of the magnets is radial or tangential consisting of a plurality of circumferentially positioned magnets
    • H02K1/2753Inner rotor where the magnetisation axis of the magnets is radial or tangential consisting of a plurality of circumferentially positioned magnets consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276Magnets embedded in the magnetic core
    • H02K1/2766Magnets embedded in the magnetic core having a flux concentration effect

Abstract

The application provides a kind of rotor and motor.The rotor includes rotor core (1) and the multiple magnetic barrier groups being circumferentially arranged along rotor core (1), each magnetic barrier group includes the multiple magnetic flux barriers (2) radially arranged, magnetic flux path (3) are formed between two adjacent magnetic flux barriers (2), the both ends of magnetic flux path (3) are respectively arranged with permanent magnet, permanent magnet radial magnetizing.It according to the rotor of the application, enables to motor operation to be in and increases magnetic state, armature-reaction ac-dc axis electric current can export permanent-magnet torque, and direct-axis current output torque increases, overall to improve motor unitary current output torque ability.

Description

Rotor and motor
Technical field
This application involves technical field of motors, and in particular to a kind of rotor and motor.
Background technique
Permanent magnetism assist in synchronization reluctance motor, makes full use of reluctance torque, accomplished with similar in rare earth permanent-magnet synchronization motor Power density and efficiency;But the permanent magnetism assist in synchronization reluctance motor salient pole ratio of traditional structure is positive, for using reluctance torque, Motor must work in weak magnetic state;When motor direct-axis current is used to weak magnetic, permanent-magnet torque will not be generated, thus current of electric Effective rate of utilization reduce, unitary current output torque ability is poor.
Summary of the invention
Therefore, the application technical problems to be solved are to provide a kind of rotor and motor, and motor is enabled to transport Row can export permanent-magnet torque in magnetic state, armature-reaction ac-dc axis electric current is increased, and direct-axis current output torque increases, overall Improve motor unitary current output torque ability.
To solve the above-mentioned problems, the application provides a kind of rotor, including rotor core and along the week of rotor core To multiple magnetic barrier groups of arrangement, each magnetic barrier group includes the multiple magnetic flux barriers radially arranged, two adjacent magnetic flux barriers Between form magnetic flux path, the both ends of magnetic flux path are respectively arranged with permanent magnet, permanent magnet radial magnetizing.
Preferably, the magnetizing direction of permanent magnet is consistent with motor d-axis direction.
Preferably, multiple permanent magnets are along the circumferentially-spaced arrangement of rotor core, each permanent magnet is corresponding to a magnetic flux The one end in channel.
Preferably, permanent magnetism slot is provided on the periphery wall of rotor core, permanent magnet is mounted in permanent magnetism slot.
Preferably, rotor core includes multiple magnetic poles, and the permanent magnet in each magnetic pole is about motor d axial symmetry.
Preferably, in a magnetic pole, each magnetic barrier group include two magnetic flux barriers, permanent magnet include the first permanent magnet, Second permanent magnet and third permanent magnet, wherein the first permanent magnet is located at the radially outer peripheral side of magnetic barrier group, the second permanent magnet is located at two Between a magnetic flux barrier, third permanent magnet is located between two magnetic flux barriers of motor d axis two sides, and third permanent magnet itself closes In motor d axial symmetry.
Preferably, the permanent magnet of same magnetic pole has predetermined width, and the permanent magnet of predetermined width makes the excitation magnetic of permanent magnet Field forms sine magnetic field.
Preferably, the circumferential width of the first permanent magnet is x, and the circumferential width of the second permanent magnet is y, the week of third permanent magnet It is z, wherein x:y:z/2=2:3.5:4 to width.
Preferably, the two sides of permanent magnetism slot form lug boss, the circumferential overall width of permanent magnet and the circumferential overall width of lug boss Between ratio range be 0.9~1.1.
Preferably, it is formed on the periphery wall of rotor core of the adjacent magnetic pole at intersection location fluted.
Preferably, the two sides of permanent magnetism slot form lug boss, and magnetic flux barrier extends in lug boss.
According to the another aspect of the application, a kind of motor, including rotor are provided, concept rotor is above-mentioned Rotor.
Rotor provided by the present application, including rotor core and along the multiple magnetic barrier groups of rotor core being circumferentially arranged, Each magnetic barrier group includes the multiple magnetic flux barriers radially arranged, and forms magnetic flux path, magnetic between two adjacent magnetic flux barriers The both ends of circulation passage are respectively arranged with permanent magnet, permanent magnet radial magnetizing.When being run using the Rated motor of the rotor, electricity Pivot reaction can export permanent-magnet torque in magnetic state, motor ac-dc axis electric current is increased;Motor direct-axis current generates reluctance torque, Meanwhile direct-axis current increases permanent magnet and generates magnetic field, so that motor permanent-magnet torque is enhanced;Quadrature axis current and permanent magnetic field are made With generation permanent-magnet torque;Permanent-magnet torque is identical as reluctance torque direction, to improve permanent magnetism assist in synchronization reluctance motor unit Electric current output torque ability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the rotor of the embodiment of the present application;
Fig. 2 is the magnetic pole distributed architecture figure of the rotor of the embodiment of the present application;
Fig. 3 is the dimensional structure figure of the rotor of the embodiment of the present application;
Fig. 4 is the side view of the motor of the embodiment of the present application;
Fig. 5 is the structural schematic diagram of the motor of the embodiment of the present application;
Fig. 6 is Conventional permanent magnet assist in synchronization reluctance motor torque angle displacement characteristic schematic diagram in the prior art;
Fig. 7 is the torque angle displacement characteristic schematic diagram of the inverse salient-pole machine of the embodiment of the present application.
Appended drawing reference indicates are as follows:
1, rotor core;2, magnetic flux barrier;3, magnetic flux path;4, permanent magnetism slot;5, the first permanent magnet;6, the second permanent magnet; 7, third permanent magnet;8, lug boss;9, groove;10, stator.
Specific embodiment
The Formula of Electromagnetic of permanent magnetism assist in synchronization reluctance motor is as follows:
Te=p (Ld-Lq)idiq+pψPMiq
Wherein, p is motor number of pole-pairs, and Ld is motor d-axis, and Lq is axis inductor, and id, iq are stator current space vector In the component of ac-dc axis, ψ PM is that permanent magnet generates magnetic linkage;Traditional permanent magnetism assist in synchronization reluctance motor Ld < Lq, only when id < 0, magnetic Resistive torque is in the same direction with permanent-magnet torque, at this point, id has weakening effect to permanent magnetic field, therefore, motor output torque is relatively low.In order to Change the above problem, spy proposes the application.
In conjunction with referring to figs. 1 to 5, according to an embodiment of the present application, rotor includes rotor core 1 and along rotor The multiple magnetic barrier groups of iron core 1 being circumferentially arranged, each magnetic barrier group include the multiple magnetic flux barriers 2 radially arranged, and adjacent two Magnetic flux path 3 is formed between a magnetic flux barrier 2, the both ends of magnetic flux path 3 are respectively arranged with permanent magnet, permanent magnet radial magnetizing.
When running using the Rated motor of the rotor, armature-reaction, which is in, increases magnetic state, and motor ac-dc axis electric current is equal Permanent-magnet torque can be exported;Motor direct-axis current generates reluctance torque, meanwhile, direct-axis current increases permanent magnet and generates magnetic field, makes Obtaining motor permanent-magnet torque is enhanced;Quadrature axis current and permanent magnetic field effect generate permanent-magnet torque;Permanent-magnet torque and reluctance torque Direction is identical, to improve permanent magnetism assist in synchronization reluctance motor unitary current output torque ability.Multiple magnetic flux barriers 2 are along electricity The arrangement of machine quadrature axis direction reduces motor axis inductor so as to increase quadrature-axis reluctance.
In conjunction with referring to shown in Fig. 6 and Fig. 7, in figure, Temb is permanent-magnet torque, and Ta is reluctance torque, and Tem is synthesis torque; Shown in Fig. 6 when angle of torsion is greater than 90 °, synthesis torque Tem is maximum, and motor armature-reaction when reaching torque capacity weakens forever Magnets magnetic fields, motor are in weak magnetic state, and angle of torsion is less than 90 ° when torque capacity shown in Fig. 7, when torque capacity is run, motor Armature field enhances rotor permanent magnet magnetic field, and motor, which is in, increases magnetic state.
The application optimizes motor rotor construction, and when motor being made to work, direct-axis current enhances magnetic field of permanent magnet, for generating Effective permanent-magnet torque, meanwhile, reluctance torque is identical as permanent-magnet torque direction, so that motor unitary current is made to generate bigger torque, At this point, motor d-axis inductance is greater than axis inductor, motor salient pole ratio is negative, and such motor is known as inverse salient pole permanent magnetism assist in synchronization magnetic Hinder motor.Inverse salient pole permanent magnetism assist in synchronization reluctance motor Ld > Lq, as id > 0, reluctance torque is in the same direction with permanent-magnet torque, at this point, Id enhances magnetic field of permanent magnet, so as to improve motor unitary current output torque.
In addition, unlike traditional permanent magnetism assist in synchronization reluctance motor, using the motor operation of the application rotor When, inverse salient pole permanent magnetism assist in synchronization reluctance motor structure makes reluctance torque and permanent-magnet torque in less than 90 degree electrical angles of angle of torsion Shi Fangxiang is identical, so that motor direct-axis current component generates reluctance torque increases permanent-magnet torque, motor output torque ability simultaneously It improves.Since motor direct-axis current is humidification, d-axis armature reacting field direction and permanent magnet magnetization side to permanent magnetic field To identical, therefore the risk that motor demagnetizes by armature-reaction can be reduced, improve running reliability of motor.When motor operation is in phase When with load torque, under the conditions of identical back-emf, because the application motor unitary current can export bigger torque, motor fortune Row electric current can be smaller, so as to which copper olse is effectively reduced, improves motor operation efficiency.
By the application motor rotor construction, so that motor d-axis inductance is greater than axis inductor, when permanent-magnet torque and magnetic resistance When torque is equidirectional, motor, which is in, increases magnetic state, and motor torque capacity can be improved, improve motor operation efficiency.
Preferably, the magnetizing direction of permanent magnet is consistent with motor d-axis direction or the magnetizing direction of permanent magnet is along magnetic The extended line direction at logical barrier both ends edge.When the magnetizing direction of permanent magnet and the motor d-axis direction of its position are consistent When or the magnetizing direction of permanent magnet when being along the extended line direction at magnetic flux barrier both ends edge, the selection of the direction of magnetization so that Motor can produce more magnetic fluxs along d-axis direction.
Preferably, multiple permanent magnets are along the circumferentially-spaced arrangement of rotor core 1, each permanent magnet is corresponding to a magnetic flux The one end in channel 3, so as to form reasonable magnetic flux width and magnetic barrier width, so that the Distribution of Magnetic Field of rotor more accords with Close sineization distribution curve.
Permanent magnetism slot 4 is provided on the periphery wall of rotor core 1, permanent magnet is mounted in permanent magnetism slot 4.Under same magnetic pole, The direction of magnetization of permanent magnet is identical, and the permanent magnet magnetization of two adjacent magnetic poles is contrary.
Rotor core 1 includes multiple magnetic poles, and the permanent magnet in each magnetic pole, can be in the magnetic pole about motor d axial symmetry Motor d axis two sides form balanced reluctance torque, improve the stability of magnetic resistance of motor torque output.
In the present embodiment for ease of description, it with rotor quadrupole, is illustrated for the permanent magnet of every pole five.
In a magnetic pole, each magnetic barrier group include two magnetic flux barriers 2, permanent magnet include the first permanent magnet 5, second forever Magnet 6 and third permanent magnet 7, wherein the first permanent magnet 5 is located at the radially outer peripheral side of magnetic barrier group, the second permanent magnet 6 is located at two Between magnetic flux barrier 2, third permanent magnet 7 is located between two magnetic flux barriers 2 of motor d axis two sides.Therefore, in a magnetic pole It is interior, including two the first permanent magnets, 5, two the second permanent magnets 6 and a third permanent magnet 7 totally five permanent magnets, wherein two 5, two the second permanent magnets 6 of a first permanent magnet are about motor d axial symmetry, and third permanent magnet 7 itself is about motor d axis pair Claim.Other numbers of poles and every pole permanent magnet number are similar with structure;Core section includes 20 permanent magnetism slots 4, and permanent magnet passes through viscous Patch or other modes are fixed in permanent magnetism slot 4, and position of the permanent magnet in permanent magnetism slot 4 is fixed;Iron core between the adjacent pole N, S of rotor Position is connected by magnetic barrier group, and magnetic barrier group guarantees the d-axis flow direction of rotor.
Preferably, the permanent magnet of same magnetic pole has predetermined width, and the permanent magnet of predetermined width makes the excitation magnetic of permanent magnet Field forms sine magnetic field.
Preferably, the circumferential width of the first permanent magnet 5 is x, and the circumferential width of the second permanent magnet 6 is y, third permanent magnet 7 Circumferential width be z, wherein x:y:z/2=2:3.5:4.
Preferably, the two sides of permanent magnetism slot 4 form lug boss 8, the circumferential overall width of permanent magnet and the circumferential beam overall of lug boss 8 Ratio range between degree is 0.9~1.1.
It is same extremely under permanent magnet width design need to guarantee every sine for extremely descending permanent magnet excitation field;And permanent magnet with The size of 8 relative width of lug boss of rotor core, then determine the motor of the application in the process of running reluctance torque with forever The size of magnetic torque.Specifically, can preferably use x:y:z=2:3.5:4 for the sine for guaranteeing every pole permanent magnetic field Ratio, the application to this ratio make it is specific limit, as long as can guarantee every sine for extremely descending permanent magnet excitation field i.e. It can.
The selection of permanent magnet circumferential direction overall width is related with the size of reluctance torque, and permanent magnet width is wider, and permanent-magnet torque is got over Greatly, reluctance torque is smaller, conversely, permanent magnet width is narrower, permanent-magnet torque is smaller, and reluctance torque is bigger.When permanent magnet overall width With rotor core lug boss overall width it is close or equal when, it is maximum that motor exports total torque.
Above-mentioned permanent magnet quantity and set-up mode are only distance explanation, not to the quantity of permanent magnet and magnetic flux barrier 2 quantity forms limitation, and the quantity of permanent magnet can be adjusted according to the quantity of magnetic flux barrier 2 and magnetic flux path 3.
Preferably, fluted 9 are formed on the periphery wall of rotor core 1 of the adjacent magnetic pole at intersection location.The groove 9 Positioned at the peripheral side of rotor core 1, it is capable of forming magnet isolation tank, therefore magnetic barrier can also be formed, so as to further to protrusion The circumferential width in portion 8 is adjusted, so that the width of permanent magnet and the circumferential width distribution of lug boss 8 are more reasonable, improves electricity The output total torque of machine.
By the rotor magnetic barrier of the application and the groove 9 between pole and pole, motor salient pole ratio can be greatly improved, Reluctance torque when improving motor operation, to improve magnetic resistance of motor torque while improving armature-reaction permanent-magnet torque, make Motor fan-out capability is obtained to improve.
The two sides of permanent magnetism slot 4 form lug boss 8, and magnetic flux barrier 2 extends in lug boss 8.Magnetic flux barrier 2 extends to protrusion In portion 8, the structure of magnetic flux path 3 can be changed by magnetic flux barrier 2, to reduce the leakage field at lug boss 8, improve magnetic flux screen Restriction effect of the barrier 2 for d-axis flow direction.
Above-mentioned permanent magnet is, for example, magnet steel.
According to an embodiment of the present application, motor includes rotor, which is above-mentioned rotor.
Motor further includes stator 10, and stator 10 includes stator core and the embedding winding being wound in stator core, stator core It is formed by silicon steel plate stacking.Rotor is set in stator 10, the rotor core 1 of rotor by different-thickness silicon steel sheet It is overrided to form, magnetic slot is provided on rotor core excircle, magnetic slot is distributed in motor rotor core circumference according to certain rules.
Those skilled in the art will readily recognize that above-mentioned each advantageous manner can be free under the premise of not conflicting Ground combination, superposition.
The above is only the preferred embodiments of the application, not to limit the application, it is all in spirit herein and Made any modifications, equivalent replacements, and improvements etc., should be included within the scope of protection of this application within principle.Above only It is the preferred embodiment of the application, it is noted that for those skilled in the art, do not departing from this Shen Several improvements and modifications please can also be made, these improvements and modifications also should be regarded as the guarantor of the application under the premise of technical principle Protect range.

Claims (12)

1. a kind of rotor, which is characterized in that including rotor core (1) and being circumferentially arranged along the rotor core (1) Multiple magnetic barrier groups, each magnetic barrier group include the multiple magnetic flux barriers (2) radially arranged, two adjacent magnetic flux barriers (2) it Between formed magnetic flux path (3), the both ends of the magnetic flux path (3) are respectively arranged with permanent magnet, the permanent magnet radial magnetizing.
2. rotor according to claim 1, which is characterized in that the magnetizing direction of the permanent magnet and motor d-axis side To consistent.
3. rotor according to claim 1, which is characterized in that multiple permanent magnets are along the rotor core (1) Circumferentially-spaced arrangement, each described permanent magnet correspond to a magnetic flux path (3) one end.
4. rotor according to claim 3, which is characterized in that be provided on the periphery wall of the rotor core (1) Permanent magnetism slot (4), the permanent magnet are mounted in the permanent magnetism slot (4).
5. rotor according to claim 1, which is characterized in that the rotor core (1) includes multiple magnetic poles, each The permanent magnet in magnetic pole is about motor d axial symmetry.
6. rotor according to claim 5, which is characterized in that in a magnetic pole, each magnetic barrier group includes Two magnetic flux barriers (2), the permanent magnet include the first permanent magnet (5), the second permanent magnet (6) and third permanent magnet (7), wherein First permanent magnet (5) is located at the radially outer peripheral side of the magnetic barrier group, and the second permanent magnet (6) is located between two magnetic flux barriers (2), Third permanent magnet (7) is located between two magnetic flux barriers (2) of motor d axis two sides, and third permanent magnet (7) itself is about motor D axial symmetry.
7. rotor according to claim 6, which is characterized in that the permanent magnet of same magnetic pole has default width Degree, the permanent magnet of predetermined width make the excitation field of the permanent magnet form sine magnetic field.
8. rotor according to claim 7, which is characterized in that the circumferential width of first permanent magnet (5) is x, The circumferential width of second permanent magnet (6) is y, and the circumferential width of the third permanent magnet (7) is z, wherein x:y:z/2=2: 3.5:4。
9. rotor according to claim 4, which is characterized in that the two sides of the permanent magnetism slot (4) form lug boss (8), the ratio range between the circumferential overall width of the permanent magnet and the circumferential overall width of the lug boss (8) be 0.9~ 1.1。
10. rotor according to claim 5, which is characterized in that rotor iron of the adjacent magnetic pole at intersection location Fluted (9) are formed on the periphery wall of core (1).
11. rotor according to claim 4, which is characterized in that the two sides of the permanent magnetism slot (4) form lug boss (8), the magnetic flux barrier (2) extends in the lug boss (8).
12. a kind of motor, including rotor, which is characterized in that the rotor is any one of claims 1 to 11 institute The rotor stated.
CN201910865509.5A 2019-09-12 2019-09-12 Rotor and motor Pending CN110460185A (en)

Priority Applications (1)

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CN201910865509.5A CN110460185A (en) 2019-09-12 2019-09-12 Rotor and motor

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Application Number Priority Date Filing Date Title
CN201910865509.5A CN110460185A (en) 2019-09-12 2019-09-12 Rotor and motor

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Publication Number Publication Date
CN110460185A true CN110460185A (en) 2019-11-15

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111082560A (en) * 2019-11-28 2020-04-28 珠海格力节能环保制冷技术研究中心有限公司 Motor rotor and motor

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CN101312307A (en) * 2007-05-22 2008-11-26 日产自动车株式会社 Motor
CN102761187A (en) * 2012-05-28 2012-10-31 珠海格力节能环保制冷技术研究中心有限公司 Motor rotor and built-in type permanent-magnet motor
CN103201932A (en) * 2010-09-10 2013-07-10 日产自动车株式会社 Rotary electric machine rotor
CN106208580A (en) * 2016-08-01 2016-12-07 哈尔滨工业大学 Increase the magnetic-type radially adjustable flux electric machine of built-in yi word pattern
US20170338702A1 (en) * 2016-05-17 2017-11-23 Okuma Corporation Rotor for synchronous electric motor
CN109450209A (en) * 2018-12-19 2019-03-08 上海特波电机有限公司 Bread formula permanent-magnetic synchronous motor rotor
CN109818441A (en) * 2019-03-18 2019-05-28 东南大学 A kind of magnetic barrier formula permanent-magnet magnetic resistance synchronous motor rotor structure
CN209046391U (en) * 2018-12-19 2019-06-28 上海特波电机有限公司 Permanent-magnetic synchronous motor rotor with air magnetic barrier

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101312307A (en) * 2007-05-22 2008-11-26 日产自动车株式会社 Motor
CN103201932A (en) * 2010-09-10 2013-07-10 日产自动车株式会社 Rotary electric machine rotor
CN102761187A (en) * 2012-05-28 2012-10-31 珠海格力节能环保制冷技术研究中心有限公司 Motor rotor and built-in type permanent-magnet motor
US20170338702A1 (en) * 2016-05-17 2017-11-23 Okuma Corporation Rotor for synchronous electric motor
CN106208580A (en) * 2016-08-01 2016-12-07 哈尔滨工业大学 Increase the magnetic-type radially adjustable flux electric machine of built-in yi word pattern
CN109450209A (en) * 2018-12-19 2019-03-08 上海特波电机有限公司 Bread formula permanent-magnetic synchronous motor rotor
CN209046391U (en) * 2018-12-19 2019-06-28 上海特波电机有限公司 Permanent-magnetic synchronous motor rotor with air magnetic barrier
CN109818441A (en) * 2019-03-18 2019-05-28 东南大学 A kind of magnetic barrier formula permanent-magnet magnetic resistance synchronous motor rotor structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111082560A (en) * 2019-11-28 2020-04-28 珠海格力节能环保制冷技术研究中心有限公司 Motor rotor and motor

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