CN102355072A - Surface-mounted permanent-magnetic motor rotor and motor comprising same - Google Patents
Surface-mounted permanent-magnetic motor rotor and motor comprising same Download PDFInfo
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- CN102355072A CN102355072A CN2011103024127A CN201110302412A CN102355072A CN 102355072 A CN102355072 A CN 102355072A CN 2011103024127 A CN2011103024127 A CN 2011103024127A CN 201110302412 A CN201110302412 A CN 201110302412A CN 102355072 A CN102355072 A CN 102355072A
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Abstract
The invention discloses a surface-mounted permanent-magnetic motor rotor, which comprises a rotating shaft and a rotor iron core, wherein the surface of the rotor iron core is provided with a permanent magnet body, and the outer surface of the permanent magnet body in the radial direction is in an undulated shape. The permanent magnet body can adopt surface-mounted magnetized magnetic steel. The invention also discloses a motor, which comprises a stator and the rotor. Due to the adoption of the surface-mounted permanent-magnetic motor rotor, the waveform of an air gap field of the motor can be improved, the fundamental wave times of the cogging torque fluctuation can be increased, the cogging fundamental wave and the ultra-harmonics torque amplitude can be reduced, and the torque fluctuation caused by the cogging can be reduced.
Description
Technical field
The present invention relates to motor, particularly the rotor of motor the invention still further relates to the motor that comprises this rotor.
Background technology
Electric automobile is as cleaning, energy-conservation new traffic tool, and its maximum advantage is " zero discharge ".Because it does not pollute in the process of moving, thermal radiation is low, and noise is little, does not consume gasoline, can use various energy resources, uses easy to maintenancely, becomes current automobile and researches and develops focus.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 come drive wheels to travel with motor, 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, overload capacity is low and defective such as poor reliability, be difficult to satisfy the requirement of industrialization.
Summary of the invention
The objective of the invention is to overcome the defective of above-mentioned prior art, a kind of surface-mounted permanent magnet machine rotor and the motor that comprises this rotor are provided, it has the advantage that response is fast, noise is low and reliability is high, and has improved its overload capacity.
For reaching above purpose, the solution that the present invention adopted is:
A kind of rotor comprises rotating shaft and rotor core, on this rotor core surface permanent magnet is set, its radially-outer surface undulate.
Wherein, the two ends of said permanent magnet are provided with the oblique angle.
Said permanent magnet is surface-mounted permanent magnet.
Said permanent magnet is the magnetization magnet steel.
A kind of motor comprises stator and above-mentioned rotor.
Owing to adopted such scheme; The present invention has following characteristics: 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; Make the synthetic torque ripple of motor significantly reduce (reducing 35-45%); Suppress static and dynamic armature reaction; D axle and q axle radial load are tended to balance; Reduce mechanical oscillation, the centrifugal force in the time of can significantly reducing the rotor high-speed operation helps the motor frequent starting; Improve overload capacity, make motor have high output; High reliability; Low fluctuation; Fast-response; Low noise; Characteristics such as miniaturization and and even running.
Description of drawings
Fig. 1 is the sketch map of the embodiment of the invention.
Fig. 2 is the cogging torque of motor before and after p-m rotor is optimized and the chart that the anglec of rotation concerns waveform.
Embodiment
The present invention is further illustrated below in conjunction with the accompanying drawing illustrated embodiment.
The torque ripple that causes 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.The 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 are the complex structures that makes motor.
Fig. 1 is the generalized section of the embodiment of the invention.This automobile-used drive motors and low noise low-fluctuation permanent magnetic rotor thereof; Comprise stator and rotor in casing and the casing; Stator comprises stator core and the stator winding that is fixed on casing inner wall; Stator core comprises stator winding 2, stator yoke 5, stator slot 6 and stator tooth 7, and rotor comprises rotating shaft 9 and rotor core 3.The outer surface-mounted permanent magnet of placing (SPM) of rotor core, its radially-outer surface undulate, this permanent magnet can be the magnetization magnet steel.That is, this permanent magnet is surface-mounted waveform magnet steel 1.Surface-mounted permagnetic synchronous motor adopts waveform magnet steel 1, has improved the first-harmonic number of times of cogging torque fluctuation effectively, reduces teeth groove first-harmonic and high order harmonic component torque amplitude, reduces the torque ripple that teeth groove causes, the synthetic torque ripple of motor is significantly reduced.
Improve the first-harmonic number of times (frequency) of cogging torque fluctuation; Just can effectively reduce teeth groove first-harmonic and high order harmonic component torque amplitude; Reduce the torque fluctuations that teeth groove causes; For a long time; One of measure that improves the reduction torque fluctuations is exactly to increase number of stator slots, improves the first-harmonic number of times (frequency) of cogging torque fluctuation, but such complex manufacturing; The stator slot difficulty that rolls off the production line increases, and efficient also reduces; For a long time, two of the measure of raising reduction torque fluctuations is exactly stator core skewed slot (angle that the stator core axial torsion is certain), but makes complex manufacturing so equally, and the stator slot area is reduced, and reduction is exerted oneself, and loses more than gain.Surface-mounted permagnetic synchronous motor adopts waveform magnet steel 1; Be equivalent to increase the groove number of motor; It is ingenious just to be: under the condition that does not increase number of slots; Can improve the first-harmonic number of times (frequency) of cogging torque (moment) fluctuation; Reduce teeth groove first-harmonic and high order harmonic component torque amplitude; Reduce the torque ripple that teeth groove causes, realize the speed governing even running;
The waveform magnet steel of surface-mounted magneto is equivalent to a fairly large number of semicircle groove, significantly improves the first-harmonic number of times (frequency) of cogging torque (moment) fluctuation, reduces teeth groove first-harmonic and high order harmonic component torque amplitude;
The most severe place of armature reaction is just at magnet steel (magnetic pole) two ends (pole tip place) under the load; The advantage of waveform magnet steel design is: make the transition of magnet steel right ends that nature inclination (oblique angle is arranged) arranged; Forming magnet steel right ends (pole tip place) air gap strengthens; The distortion of the air-gap field waveform that remarkable minimizing armature reaction magnetic flux causes; Improve the motor gas-gap magnetic flux density waveforms, help suppressing torque fluctuations.
Said structure not only can improve the first-harmonic number of times of cogging torque fluctuation effectively; 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; And the radial load of (q axle) between magnetic pole middle (d axle) and adjacent pole is tended to balance, reduce mechanical oscillation, the centrifugal force in the time of can significantly reducing the rotor high-speed operation; Help the motor frequent starting, improve overload capacity.The variation that radial centrifugal force distributes can cause mechanical oscillation.During the motor rotation, the difference in size of radial centrifugal force and continuous alternate cause bigger mechanical oscillation.Therefore, reduce the difference of radial load, make both sizes be tending towards approaching, can effectively reduce the torque ripple that teeth groove causes.Because reduced the variation of air-gap permeance, thereby reduce the variation of air-gap field energy storage when rotor rotates, weakened magnetic resistance moment, suppressed the torque fluctuations that teeth groove causes.Teeth groove moment is also claimed magnetic resistance moment, is critical defect in the drive system of electric automobile.
Fig. 2 is that the cogging torque and the anglec of rotation of motor concerned waveform before and after p-m rotor was optimized.N is the cogging torque waveform of conventional similar magneto (surface-mounted permanent-magnetic electric machine rotor magnet steel is the open semicircle groove not); M is that rotor is provided with the waveform magnet steel cogging torque waveform of (being equivalent to a fairly large number of semicircle groove); The latter; Significantly reduce the torque ripple that teeth groove causes, the synthetic torque ripple of motor is reduced reduce 35-45%.
In a word; Above-mentioned aggregate measures; 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; Make the synthetic torque ripple of motor significantly reduce (reducing 35-45%); Suppress static and dynamic armature reaction; Radial load is tended to balance; Reduce mechanical oscillation; Anti-high speed centrifugation power reduces the rotor high-speed centrifugal force in when operation, the centrifugal force in the time of can significantly reducing the rotor high-speed operation with help the motor frequent starting; Improve overload capacity, make motor have low noise; Low fluctuation; High power density; Torque density; High reliability; Fast-response; Characteristics such as miniaturization and and even running.
The above-mentioned description to embodiment is can understand and use the present invention for ease of the those of ordinary skill of this technical field.The personnel of skilled obviously can easily make various modifications to these embodiment, and needn't pass through performing creative labour being applied in the General Principle of this explanation among other embodiment.Therefore, the invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and not breaking away from the improvement that category of the present invention makes and revise all should be within protection scope of the present invention.
Claims (5)
1. a rotor comprises rotating shaft and rotor core, it is characterized in that: on this rotor core surface permanent magnet is set, its radially-outer surface undulate.
2. rotor according to claim 1 is characterized in that: the two ends of said permanent magnet are provided with the oblique angle.
3. rotor according to claim 1 is characterized in that: said permanent magnet is surface-mounted permanent magnet.
4. rotor according to claim 3 is characterized in that: said permanent magnet is the magnetization magnet steel.
5. a motor comprises stator and rotor, it is characterized in that, this rotor is each described rotor of claim 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103024127A CN102355072A (en) | 2011-09-28 | 2011-09-28 | Surface-mounted permanent-magnetic motor rotor and motor comprising same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103024127A CN102355072A (en) | 2011-09-28 | 2011-09-28 | Surface-mounted permanent-magnetic motor rotor and motor comprising same |
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| CN102355072A true CN102355072A (en) | 2012-02-15 |
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| CN2011103024127A Pending CN102355072A (en) | 2011-09-28 | 2011-09-28 | Surface-mounted permanent-magnetic motor rotor and motor comprising same |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158311A (en) * | 2014-09-05 | 2014-11-19 | 清华大学 | Motor with irregular tooth crests for reducing radial electromagnetic exciting force |
| CN105429412A (en) * | 2015-12-22 | 2016-03-23 | 珠海格力节能环保制冷技术研究中心有限公司 | Surface-mounted inner rotor permanent magnet synchronous motor |
| CN107787547A (en) * | 2015-06-30 | 2018-03-09 | 罗伯特·博世有限公司 | The motor of slot effect and torque ripple with reduction |
| CN109067021A (en) * | 2018-07-26 | 2018-12-21 | 珠海格力电器股份有限公司 | Magnetic shoe, rotor, motor |
| CN110785913A (en) * | 2017-06-15 | 2020-02-11 | 利莱森玛电机公司 | Rotating electrical machine |
| US10658891B2 (en) | 2015-12-29 | 2020-05-19 | Danfoss (Tianjin), Ltd. | Motor |
| US11575285B2 (en) | 2020-12-09 | 2023-02-07 | Ford Global Technologies, Llc | Electric machine |
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| JP2002262491A (en) * | 2001-03-02 | 2002-09-13 | Sankyo Seiki Mfg Co Ltd | Motor and geared motor |
| CN101061620A (en) * | 2004-09-22 | 2007-10-24 | 西门子公司 | Permanently excited synchronous machine comprising suppression means for improving torque irregularities |
| CN101222154A (en) * | 2007-01-12 | 2008-07-16 | 台达电子工业股份有限公司 | Rotation structure of permanent magnet motor |
| CN201781345U (en) * | 2010-08-12 | 2011-03-30 | 苏州三星电子有限公司 | Arc magnet type direct current motor rotor |
-
2011
- 2011-09-28 CN CN2011103024127A patent/CN102355072A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002262491A (en) * | 2001-03-02 | 2002-09-13 | Sankyo Seiki Mfg Co Ltd | Motor and geared motor |
| CN101061620A (en) * | 2004-09-22 | 2007-10-24 | 西门子公司 | Permanently excited synchronous machine comprising suppression means for improving torque irregularities |
| CN101222154A (en) * | 2007-01-12 | 2008-07-16 | 台达电子工业股份有限公司 | Rotation structure of permanent magnet motor |
| CN201781345U (en) * | 2010-08-12 | 2011-03-30 | 苏州三星电子有限公司 | Arc magnet type direct current motor rotor |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158311A (en) * | 2014-09-05 | 2014-11-19 | 清华大学 | Motor with irregular tooth crests for reducing radial electromagnetic exciting force |
| CN107787547A (en) * | 2015-06-30 | 2018-03-09 | 罗伯特·博世有限公司 | The motor of slot effect and torque ripple with reduction |
| US10530208B2 (en) | 2015-06-30 | 2020-01-07 | Robert Bosch Gmbh | Electrical machine with reduced cogging and torque ripple |
| CN107787547B (en) * | 2015-06-30 | 2020-07-10 | 罗伯特·博世有限公司 | Electric machine with reduced cogging and torque ripple |
| CN105429412A (en) * | 2015-12-22 | 2016-03-23 | 珠海格力节能环保制冷技术研究中心有限公司 | Surface-mounted inner rotor permanent magnet synchronous motor |
| CN105429412B (en) * | 2015-12-22 | 2018-10-19 | 珠海格力节能环保制冷技术研究中心有限公司 | Surface-mount type internal rotor permanent-magnetic synchronous motor |
| US10658891B2 (en) | 2015-12-29 | 2020-05-19 | Danfoss (Tianjin), Ltd. | Motor |
| CN110785913A (en) * | 2017-06-15 | 2020-02-11 | 利莱森玛电机公司 | Rotating electrical machine |
| US11735967B2 (en) | 2017-06-15 | 2023-08-22 | Moteurs Leroy-Somer | Rotary electric machine with rotor having permanent magnets with concave faces between two flat portions |
| CN109067021A (en) * | 2018-07-26 | 2018-12-21 | 珠海格力电器股份有限公司 | Magnetic shoe, rotor, motor |
| US11575285B2 (en) | 2020-12-09 | 2023-02-07 | Ford Global Technologies, Llc | Electric machine |
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Application publication date: 20120215 |