CN103280904A - Double-layer V-shaped built-in permanent magnet motor rotor for electric automobile - Google Patents
Double-layer V-shaped built-in permanent magnet motor rotor for electric automobile Download PDFInfo
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- CN103280904A CN103280904A CN2013101607977A CN201310160797A CN103280904A CN 103280904 A CN103280904 A CN 103280904A CN 2013101607977 A CN2013101607977 A CN 2013101607977A CN 201310160797 A CN201310160797 A CN 201310160797A CN 103280904 A CN103280904 A CN 103280904A
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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
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- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The invention relates to a double-layer V-shaped built-in permanent magnet motor rotor for an electric automobile. Multiple groups of permanent magnet slots which are radially arranged in an inner layer and an outer layer are uniformly arranged on the iron core of the rotor at intervals along the circumferential direction; one or more V-shaped magnetized stripy magnetic steel is embedded in each permanent magnet slot. By virtue of the optimization of structures such as the angle of polar arc of inner-layer V-shaped magnetic steel, the included angle of outer-layer V-shaped magnetic steel, the width proportion of the inner-layer magnetic steel to the outer-layer V-shaped magnetic steel and the included angle of the outer-layer forcipated permanent magnet slot and the outer-layer magnetic steel, the air-gap flux density waveform is more approximate to the sinusoidal distribution, the harmonic component is reduced, the air-gap field waveform of the motor is improved, the fundamental wave frequency of spline torque fluctuation is improved, the spline fundamental wave and the ultraharmonics torque amplitude value are reduced, the torque fluctuation caused by splines is reduced, and the synthesis torque fluctuation of the motor is greatly reduced; and meanwhile, the reluctance torque is obviously increased, the salient pole rate and flux weakening speed expanding capability of the motor are improved, a constant-power speed range wider than that of a surface-mounted permanent magnet motor can be obtained, and the driving requirement of electric and hybrid automobiles can be met.
Description
Technical field
The present invention relates to the double-deck V-type interior permanent magnet machines of used for electric vehicle, relate in particular to the rotor of a kind of efficient, high output, high power density, high reliability, high overload ability, low fluctuation, low noise, miniaturization and and even running, belong to technical field of motors.
Background technology
Driving control system for electric machine is the main execution architecture in the electric automobile during traveling process, its drive system is the heart of electric automobile, fuel cell car in the electric automobile (FCV), hybrid vehicle (HEV) and pure electric automobile (EV) three major types all will drive wheel with motor and travel, and optimizing electric machine structure is the key factor that improves all kinds of electric automobile cost performances.
Be applicable to aspect the exploitation of used for electric vehicle high-quality permanent magnet drive motors at present, also exist various technical bottlenecks, have that noise is big, torque ripple is big, power density is low, weak magnetism speed expansion is difficult, overload capacity is low and defective such as poor reliability, be difficult to satisfy the requirement of industrialization.
The torque ripple that is caused by the electromagnetism reason, produce machinery and electromagnetic noise, influence motor even running and reliability, it is divided into two kinds: a kind of is cogging torque, it is the torque that stator teeth groove and rotor permanent magnet interact and produce, this torque causes fluctuation with the locus do cyclic variation, and it and stator current have nothing to do; Another kind is the ripple torque, i.e. the harmonic torque that is caused by electric current and counter potential waveform difference.The torque ripple of automobile permanent magnet synchronous motor is the stack of cogging torque and ripple torque.Countries in the world electromechanics trade and R﹠D institution are all in the research of trying hard to reduce the motor torque fluctuation, as adopt mark channel process, auxiliary channel process, auxiliary tooth method, skewed slot method, oblique utmost point method, the channel process of remaining silent and magnetize slot wedge method etc., cut both ways, it is always undesirable to eliminate the slot effect measure.Skewed slot or the oblique utmost point also can reduce torque ripple, but skewed slot, tiltedly utmost point method is influential to square wave motor gas-gap magnetic flux density flat-top width, and skewed stator slot can influence the groove area that accounts for of conductor simultaneously, and copper loss is increased, both all reduce and exert oneself, and make the complex structure of motor.
Fig. 1 is built-in yi word pattern permagnetic synchronous motor (IPMSM) profile of prior art, this automobile-used drive motors, comprise stator and rotor in casing and the casing, stator comprises stator core and the stator winding that is fixed on casing inner wall, comprise stator yoke 5, stator slot 6 and stator tooth 7 on the stator core, rotor comprises rotating shaft and rotor core 3, and rotor core inner periphery direction radially evenly has individual layer permanent magnetism groove 2, evenly studs with diametrical magnetization rectangular strip magnet steel 1.
The internal permanent magnet synchronous motor of above-mentioned prior art, the advantage of comparing with surface-adhered type is that rotor is typical salient-pole structure, hand over the axle inductance greater than d-axis inductance (Lq＞Ld), saliency is arranged, salient pole rate=(Lq/Ld)＞1, make motor on the basis of permanent-magnet torque superposition reluctance torque, reluctance torque have starting characteristic, overload capacity and a power density that helps improve motor, be easy to weak-magnetic speed-regulating, enlarge permanent power bracket operation.But individual layer yi word pattern or V-type interior permanent magnet machines, the air gap flux density waveform can not be realized Sine distribution, make the phase induced electromotive force have 3,5,7,11,13 inferior high order harmonic components, more harmonic component, cause bigger torque pulsation, and individual layer built-in type permanent-magnet d axle and q axle magnetic resistance be more or less the same, the reluctance torque of generation is limited, weak magnetism speed expansion ability, efficient and power density etc. are difficult to satisfy the performance requirement of modern automobile-used drive motors.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists, the double-deck V-type interior permanent magnet machines of a kind of used for electric vehicle rotor is provided, can increase reluctance torque, improve motor salient pole rate, weak magnetism speed expansion ability, make the even running of motor energy high power, low fluctuation, wide range speed control, fast-response.
The objective of the invention is to be achieved through the following technical solutions:
The double-deck V-type interior permanent magnet machines of a kind of used for electric vehicle rotor, it is characterized in that, along the circumferential direction even compartment of terrain arranges the many groups of permanent magnetism grooves that are inside and outside bilayer diametrically on rotor core, evenly studs with one or more magnetization strip magnet steel in the described permanent magnetism groove.
Described permanent magnetism groove and the inner magnetization strip magnet steel of inlaying thereof form V-type; Inside and outside two-layer V-type permanent magnetism groove, V-type magnet steel spacing equate.
V-type magnetization strip magnet steel and the pole shoe of every group of bilayer constitute a permanent magnetism magnetic pole.
Between described permanent magnetism magnetic pole, arrange every the magnetic magnetic bridge.
The scope of the polar arc angle α 1 of internal layer V-type magnet steel is 24 °-27.5 °.
The scope of the angle α 2 of outer V-type magnet steel is 155 °-160 °.
Along the internal layer magnet steel width PM2 of permanent magnetism groove trend and the pass of outer magnet steel width PM1 be: PM1=(0.78-0.8) PM2.
The two ends of outer permanent magnetism groove are pincerlike.
The scope of the angle β of outer pincerlike permanent magnetism groove and the magnet steel inlayed in it is: 42 °-48 °.
Be set in the interior magnet thickness of permanent magnetism groove greater than the thickness of this permanent magnetism groove.
The beneficial effect that the present invention reaches:
Rotor structure for permanent magnet motor of the present invention improves the motor gas-gap field waveform, improve the first-harmonic number of times of cogging torque fluctuation, reduce teeth groove first-harmonic and high order harmonic component torque amplitude, reduce the torque ripple that teeth groove causes, the synthetic torque ripple of motor is significantly reduced, significantly increase reluctance torque simultaneously, improve motor salient pole rate and weak magnetism speed expansion ability, obtain the broader constant power speed range of specific surface installing type magneto, satisfy electronic, hybrid vehicle driving requirement.
Description of drawings
Fig. 1: built-in yi word pattern permagnetic synchronous motor (IPMSM) profile of prior art;
Fig. 2: the profile of an embodiment of double-deck V-type interior permanent magnet machines rotor of the present invention;
Fig. 3.: the profile of another embodiment of double-deck V-type interior permanent magnet machines rotor of the present invention;
Fig. 4: the profile of the another embodiment of double-deck V-type interior permanent magnet machines rotor of the present invention;
Cogging torque and the anglec of rotation concerned schematic diagram before the motor rotor construction of Fig. 5: Fig. 2 was namely optimized;
The motor rotor construction of Fig. 6: Fig. 2 is optimized polar arc angle α 1 back cogging torque and the anglec of rotation concerns schematic diagram;
The motor rotor construction of Fig. 7: Fig. 2 is optimized polar arc angle α 1+ angle α 2 back cogging torques and the anglec of rotation concerns schematic diagram;
Cogging torque and the anglec of rotation concern schematic diagram behind the motor rotor construction optimization polar arc angle α 1+ angle α 2 of Fig. 8: Fig. 2, inside and outside double-deck magnet steel width PM and outer permanent magnetism groove and the magnet steel angle β;
Fig. 9: rotor structure of the present invention is optimized electric current, power, efficient and the angle of torsion relation curve of front motor;
Figure 10: the electric current of rotor structure complex optimum rear motor of the present invention, power, efficient and angle of torsion relation curve.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated.
Fig. 2 is the profile of an embodiment of double-deck V-type interior permanent magnet machines rotor of the present invention, this rotor comprises rotating shaft (not shown) and rotor core 3, rotor core 3 inner periphery directions radially evenly have inside and outside double-deck permanent magnetism groove 2a, 2b, evenly stud with two rectangular strip magnet steel 1a, 1b in permanent magnetism groove 2a, the 2b, every layer magnet steel 1a, 1b is two blocks of magnet steel of separate separation, two blocks of magnet steel are formed V-type, form inside and outside double-deck V-type diametrical magnetization rectangular strip magnet steel 1a, 1b, be called double-deck V-type built-in type permanent-magnet (IPM).Constitute permanent magnetism magnetic pole by double-deck V-type diametrical magnetization rectangular strip magnet steel and pole shoe 8, the centrifugal force that rotor magnetic steel is caused reduces greatly.
Intermarginal setting is optimized the magnetic bridge width every magnetic magnetic bridge 9 outside double-deck V-type built-in magnet steel two ends and rotor, guarantees mechanical strength and forms saturable magnetic circuit, reduces leakage field.Leakage field everywhere every the outside of magnetic magnetic bridge 9 at permanent magnetism groove 2a, 2b, is resisted with permanent magnetism groove 2a, 2b altogether jointly in every extremely double-deck two ends.Simultaneously because the ability of anti-high speed centrifugation power strengthens, every magnetic magnetic bridge 9 can design narrower, leakage flux still less, the air gap flux density multiplication significantly improves electric efficiency, overload capacity, torque density and power density, increases reluctance torque, improves the weak magnetism speed expansion ability.
Be example with electronic big bus with the rotor of 60KW motor, adopt the motor rotor construction teeth groove moment Tc og of the invention described above and anglec of rotation θ to concern that as shown in Figure 5 teeth groove moment Tc og peak value is 16.5Nm.
On the basis of embodiment 1, present embodiment is optimized the structure of rotor.
Optimize the polar arc angle α 1 of internal layer V-type magnet steel 1b:
By regulating the polar arc angle α 1 of internal layer V-type magnet steel 1b, by motor 12 utmost points, the angular range of control polar arc angle α 1 is: 24 °-27.5 °, other are identical with embodiment 1.
Be example with electronic big bus with the rotor of 60KW motor still in the present embodiment, the motor rotor construction teeth groove moment Tc og that adopts present embodiment to optimize concerns as shown in Figure 6 that with the anglec of rotation θ teeth groove moment Tc og peak value is 13Nm.
Effect after polar arc angle α 1 optimizes: in conjunction with Fig. 5, Fig. 6, as can be seen, make the 13Nm after teeth groove moment Tc og peak value 16.5Nm of (initial configuration for not optimizing the embodiment 1) before optimizing is reduced to optimization after polar arc angle α 1 optimizes, teeth groove moment Tc og reduces by 21.2%.
On the basis of embodiment 2, present embodiment is further optimized the structure of rotor.
In the polar arc angle α 1 that optimizes internal layer V-type magnet steel 1b, regulate the angle α 2 between outer V-type magnet steel 1a again, the scope of control angle α 2 is: 155 °-160 °.Other are identical with embodiment 2.
Be example with electronic big bus with the rotor of 60KW motor still in the present embodiment, the motor rotor construction teeth groove moment Tc og that adopts present embodiment to optimize concerns as shown in Figure 7 that with the anglec of rotation θ teeth groove moment Tc og peak value is 10.85Nm.
Effect after polar arc angle α 1 optimizes with angle α 2: in conjunction with Fig. 5, Fig. 7, as can be seen, polar arc angle α 1 makes teeth groove moment Tc og peak value be reduced to 10.85Nm from the 16.5Nm that optimizes preceding (initial configuration) after optimizing with angle α 2, and Tcog reduces by 34.2%.
Embodiment 4
On the basis of embodiment 3, present embodiment is further optimized the structure of rotor.
In the polar arc angle α 1 that optimizes internal layer V-type magnet steel 1b, angle α 2 between outer V-type magnet steel 1a, the ratio of width PM2 by regulating internal layer magnet steel 1b and the width PM1 of outer magnet steel 1a, control PM1=(0.78-0.8) PM2, other are identical with embodiment 3.
Be example with electronic big bus with the rotor of 60KW motor still in the present embodiment, the motor rotor construction teeth groove moment Tc og peak value that adopts present embodiment optimization is that 1.69Nm(figure omits).
Effect after polar arc angle α 1, angle α 2, magnet steel width ratio are optimized: make teeth groove moment Tc og peak value be reduced to 1.69Nm from the 16.5Nm that optimizes preceding (initial configuration) after polar arc angle α 1, angle α 2 and the optimization of magnet steel width ratio, Tcog reduces by 89.7%.
Fig. 3 is the profile of another embodiment of double-deck V-type interior permanent magnet machines rotor of the present invention.
And, with the optimal way among the embodiment 4, double-deck V-type interior permanent magnet machines rotor to the outer pincerlike permanent magnetism groove 2c of having of Fig. 3 is further optimized, by regulating the angle β of the outer pincerlike permanent magnetism groove 2c of Fig. 3 and outer rectangular strip magnet steel 1a, the scope of control angle β is: 42 °-48 °, make the 16.5Nm of teeth groove moment Tc og peak value from embodiment 1 be reduced to 0.78Nm, Tcog reduces by 95%, referring to Fig. 8.
Will emphasize especially: the pincerlike permanent magnetism groove 2c in the present embodiment and the angle β of outer rectangular strip magnet steel 1a are very effective to suppressing back-emf total harmonic distortion THD and reducing noise and vibration.So far, optimize α 1+ α 2+PM+ β, be called complex optimum.The effect contrast of adopting optimisation technique to reduce teeth groove moment Tc og fluctuation sees Table 1.
Table 1: adopt optimisation technique to reduce the effect of teeth groove moment Tc og fluctuation
Embodiment 6
Fig. 4 is the profile of the another embodiment of double-deck V-type interior permanent magnet machines rotor of the present invention, this rotor comprises rotating shaft (not shown) and rotor core 3, rotor core 3 inner periphery directions radially evenly have inside and outside double-deck permanent magnetism groove 2d, evenly stud with polylith strip magnet steel 1c in the permanent magnetism groove.
Its design feature: different with the structure of embodiment 1, embodiment 5 is: magnet steel 1c thickness is greater than permanent magnetism groove 2d thickness, not only the ability of anti-high speed centrifugation power strengthens, and air gap flux density increases, thus improve motor power density, torque density and overload capacity.
In the present embodiment, magnet steel 1c is made of 10 blocks of measure-alike diametrical magnetization rectangular strip magnet steel altogether, and simple in structure, processing cost reduces, is conducive to produce in batches.
Adopt the structure of embodiment 1, embodiment 5, electronic big bus is optimized design with the 60KW internal permanent magnet synchronous motor, the electric current I of 60KW motor, power P, efficiency eta and angle of torsion θ n relation curve are as shown in Figure 9.
Figure 10 is structure 60KW motor complex optimum after-current I of the present invention, power P, efficiency eta and angle of torsion θ n relation curve, and presentation of results is as shown in table 2.
Table 2: electronic big bus 60KW internal permanent magnet synchronous motor, adopt the performance of optimisation technique front and back relatively
Above-mentioned measure, improve the motor gas-gap field waveform, improve the first-harmonic number of times of cogging torque fluctuation, reduce teeth groove first-harmonic and high order harmonic component torque amplitude, reduce the torque ripple that teeth groove causes, the synthetic torque ripple of motor is significantly reduced, significantly increase reluctance torque simultaneously, improve motor salient pole rate and weak magnetism speed expansion ability, obtain specific surface installing type magneto and the broader constant power speed range of individual layer interior permanent magnet machines, satisfy electronic, hybrid vehicle driving requirement.
Be example with the electronic big bus produced with 60KW motor optimal design, make cogging torque reduce 85%-95%, rated current reduces 16.6%, and peak power increases by 57%, efficient improves 3.2%, noise and vibration reduces 8%-10%, effectively suppresses back-emf total harmonic distortion (THD) and static state, dynamic armature reaction, and d axle and q axle radial load are tended to balance, reduce mechanical oscillation, anti-high speed centrifugation power improves overload capacity, is conducive to the motor frequent starting; Make motor have characteristics such as high output, high reliability, high overload ability and power density, low fluctuation, fast-response, low noise, miniaturization and and even running.
Below only be concrete exemplary applications of the present invention, protection scope of the present invention is not constituted any limitation.All employing equivalents or equivalence are replaced and the technical scheme of formation, all drop within the rights protection scope of the present invention.
Claims (10)
1. the double-deck V-type interior permanent magnet machines of used for electric vehicle rotor, it is characterized in that, along the circumferential direction even compartment of terrain arranges the many groups of permanent magnetism grooves that are inside and outside bilayer diametrically on rotor core, evenly studs with one or more magnetization strip magnet steel in the described permanent magnetism groove.
2. the double-deck V-type interior permanent magnet machines of used for electric vehicle according to claim 1 rotor is characterized in that, described permanent magnetism groove and the inner magnetization strip magnet steel of inlaying thereof form V-type; Inside and outside two-layer V-type permanent magnetism groove, V-type magnet steel spacing equate.
3. the double-deck V-type interior permanent magnet machines of used for electric vehicle according to claim 2 rotor is characterized in that, V-type magnetization strip magnet steel and the pole shoe of every group of bilayer constitute a permanent magnetism magnetic pole.
4. the double-deck V-type interior permanent magnet machines of used for electric vehicle according to claim 3 rotor is characterized in that, arranges every the magnetic magnetic bridge between described permanent magnetism magnetic pole.
5. the double-deck V-type interior permanent magnet machines of used for electric vehicle according to claim 2 rotor is characterized in that the scope of the polar arc angle α 1 of internal layer V-type magnet steel is 24 °-27.5 °.
6. according to claim 2 or the double-deck V-type interior permanent magnet machines of 5 described used for electric vehicle rotor, it is characterized in that the scope of the angle α 2 of outer V-type magnet steel is 155 °-160 °.
7. the double-deck V-type interior permanent magnet machines of used for electric vehicle according to claim 6 rotor is characterized in that, along the internal layer magnet steel width PM2 of permanent magnetism groove trend and the pass of outer magnet steel width PM1 is: PM1=(0.78-0.8) PM2.
8. the double-deck V-type interior permanent magnet machines of used for electric vehicle according to claim 2 rotor is characterized in that, the two ends of outer permanent magnetism groove are pincerlike.
9. the double-deck V-type interior permanent magnet machines of used for electric vehicle according to claim 8 rotor is characterized in that, the scope of the angle β of outer pincerlike permanent magnetism groove and the magnet steel inlayed in it is: 42 °-48 °.
10. the double-deck V-type interior permanent magnet machines of used for electric vehicle according to claim 1 and 2 rotor is characterized in that, is set in the interior magnet thickness of permanent magnetism groove greater than the thickness of this permanent magnetism groove.
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| CN2013101607977A CN103280904A (en) | 2013-05-03 | 2013-05-03 | Double-layer V-shaped built-in permanent magnet motor rotor for electric automobile |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014226008A (en) * | 2013-05-17 | 2014-12-04 | 本田技研工業株式会社 | Rotor of rotary electric machine |
| CN104300713A (en) * | 2014-10-17 | 2015-01-21 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor rotor and permanent magnet synchronous motor applying same |
| CN105281453A (en) * | 2014-06-23 | 2016-01-27 | 西门子公司 | Mechanically stabilized rotor for a reluctance motor |
| CN106300706A (en) * | 2016-08-09 | 2017-01-04 | 珠海凌达压缩机有限公司 | Stator and motor |
| CN106787316A (en) * | 2016-12-22 | 2017-05-31 | 温岭市九洲电机制造有限公司 | A kind of lamination structure of magneto |
| CN107026548A (en) * | 2017-05-23 | 2017-08-08 | 中达电机股份有限公司 | The rotor punching of internal permanent magnet synchronous motor performance can be optimized |
| CN107408850A (en) * | 2015-03-18 | 2017-11-28 | 三菱电机株式会社 | Permanent magnetic baried type motor, pressure fan and refrigerating and air-conditioning |
| WO2017202317A1 (en) * | 2016-05-27 | 2017-11-30 | 比亚迪股份有限公司 | Double-antipode motor and electric vehicle |
| CN108336844A (en) * | 2018-03-16 | 2018-07-27 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor structure, permanent magnetism assist in synchronization reluctance motor and electric vehicle |
| CN109038886A (en) * | 2017-06-09 | 2018-12-18 | 大众汽车有限公司 | Synchronous machine with flux steering |
| CN109792176A (en) * | 2016-09-27 | 2019-05-21 | 罗伯特·博世有限公司 | Motor including rotor and stator |
| CN110063019A (en) * | 2016-11-18 | 2019-07-26 | 法雷奥电机设备公司 | With the rotating electric machine for improving performance |
| CN112653274A (en) * | 2020-12-25 | 2021-04-13 | 上海电气集团股份有限公司 | Rotor punching sheet and permanent magnet motor rotor |
| EP3767795A4 (en) * | 2018-03-16 | 2021-04-21 | Gree Electric Appliances, Inc. of Zhuhai | Rotor structure, permanent magnet auxiliary synchronous reluctance motor, and electric vehicle |
| CN114629268A (en) * | 2022-02-16 | 2022-06-14 | 珠海英搏尔电气股份有限公司 | Motor rotor, motor and vehicle |
| WO2023225627A1 (en) * | 2022-05-20 | 2023-11-23 | Alliance For Sustainable Energy, Llc | High temperature alternator for geothermal applications |
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| JP2014226008A (en) * | 2013-05-17 | 2014-12-04 | 本田技研工業株式会社 | Rotor of rotary electric machine |
| CN105281453A (en) * | 2014-06-23 | 2016-01-27 | 西门子公司 | Mechanically stabilized rotor for a reluctance motor |
| CN105281453B (en) * | 2014-06-23 | 2018-11-09 | 西门子公司 | Mechanically stable rotor for reluctance motor |
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| CN107408850A (en) * | 2015-03-18 | 2017-11-28 | 三菱电机株式会社 | Permanent magnetic baried type motor, pressure fan and refrigerating and air-conditioning |
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| WO2017202317A1 (en) * | 2016-05-27 | 2017-11-30 | 比亚迪股份有限公司 | Double-antipode motor and electric vehicle |
| CN106300706A (en) * | 2016-08-09 | 2017-01-04 | 珠海凌达压缩机有限公司 | Stator and motor |
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| CN110063019A (en) * | 2016-11-18 | 2019-07-26 | 法雷奥电机设备公司 | With the rotating electric machine for improving performance |
| CN106787316A (en) * | 2016-12-22 | 2017-05-31 | 温岭市九洲电机制造有限公司 | A kind of lamination structure of magneto |
| CN107026548A (en) * | 2017-05-23 | 2017-08-08 | 中达电机股份有限公司 | The rotor punching of internal permanent magnet synchronous motor performance can be optimized |
| CN109038886A (en) * | 2017-06-09 | 2018-12-18 | 大众汽车有限公司 | Synchronous machine with flux steering |
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