CN104242515A - Permanent-magnet brushless motor rotor with asymmetric magnet poles - Google Patents
Permanent-magnet brushless motor rotor with asymmetric magnet poles Download PDFInfo
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- CN104242515A CN104242515A CN201410494316.0A CN201410494316A CN104242515A CN 104242515 A CN104242515 A CN 104242515A CN 201410494316 A CN201410494316 A CN 201410494316A CN 104242515 A CN104242515 A CN 104242515A
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Abstract
The invention provides a permanent-magnet brushless motor rotor with asymmetric magnet poles. The permanent-magnet brushless motor rotor comprises permanent magnets and a rotor iron core. A hole and axial slots are formed in the rotor iron core, the hole is connected to a motor shaft, and the permanent magnets are arranged in the axial slots. The permanent-magnet brushless motor rotor is characterized in that the corresponding permanent magnet is arranged in each axial open slot to form a permanent magnet pole, the permanent magnet of each permanent magnet pole comprises three permanent magnet portions along the rotation direction of the motor rotor, and strong-to-weak surface magnetic fields of the three permanent magnet portions of each permanent magnet pole are sequentially distributed along the rotation direction of the motor rotor. Preferably, the permanent magnets are arranged in the axial slots to form surface-mounted permanent magnet pole structures. The permanent-magnet brushless motor rotor with the asymmetric magnet poles has the advantages that adverse effects due to armature reaction of the permanent-magnet brushless motor rotor can be effectively reduced, torque pulsation can be decreased, loss of a motor can be reduced, the torque control precision of the motor can be improved, and the motor can smoothly run.
Description
Technical field
The present invention relates to a kind of permanent magnetic brushless rotor of asymmetric magnetic pole.
Background technology
Existing permanent magnetic brushless rotor is made up of permanent magnet, rotor core and motor shaft usually.
Permanent magnet is fixed on rotor core surface by the mode of such as pasting or the collar is fixing, then forms permanent magnetic brushless rotor together with motor shaft.The magnetic pole of existing permanent magnetic brushless rotor is made up of a slice of same material or multi-disc permanent magnet usually, and the Distribution of Magnetic Field of its magnetic pole surfaces formed is symmetric form.
Permanent magnetic brushless is in running, owing to there is the problem of armature reaction between electric machine rotor, the characteristics of magnetic field distribution that show first degaussing along motor direction of rotation, then increase the magnetic is understood in the Surface field distribution of permanent magnetic brushless rotor permanent magnet magnetic pole, the Surface field distribution waveform of permanent magnetic brushless rotor permanent magnet magnetic pole can be caused like this to occur asymmetry, thus cause the Central Symmetry point of Surface field distribution waveform to offset, produce various harmonic wave.Therefore, permanent magnetic brushless can produce the excess loss brought because of armature reaction in running, also occurs larger torque pulsation simultaneously, makes permanent magnetic brushless run ride comfort and reduces.
Armature reaction is the intrinsic characteristic of motor, as long as there is electromagnetic action relation between any motor rotor, and generation armature reaction that all can be inevitable.Since the armature reaction feature of motor can not be eliminated, but can be weakened by certain methods or offset armature and react the adverse effect brought.In order to eliminate the adverse effect that permanent magnetic brushless armature reaction in running is brought, open the scoring analyses the feature of permanent magnetic brushless armature reaction in running.Permanent magnetic brushless is in running, every 60 degree of electrical degrees carry out commutation, wherein, front 30 degree of electrical degrees are armature reactions of degaussing, then 30 degree of electrical degrees are the armature reactions increasing magnetic, this will cause permanent magnetic brushless to occur asymmetry in the Surface field distribution waveform of running rotor permanent magnetism magnetic pole, namely the waveforms amplitude along 30 degree of electrical degrees before motor direction of rotation reduces, then the waveforms amplitude of 30 degree of electrical degrees can increase, thus there is waveform off-centring, bring various adverse effect.In order to address this problem, permanent magnet in permanent magnetism magnetic pole is divided into three part permanent magnets to form along rotor direction of rotation by the present invention, adopt the permanent magnet of same material, different and show and show by by force to the feature of weak Surface field distribution successively along rotor direction of rotation by magnetic Circuit Design, or adopt the permanent magnet of different materials, being shown by the strong and weak feature in the magnetic field of different materials permanent magnet own shows by distributing to weak Surface field by force along rotor direction of rotation successively, thus when making permanent magnetic brushless that armature reaction occur in running, the stronger part in rotor permanent magnet magnetic pole surfaces magnetic field is impaired to waveform open width value in the degaussing reaction of front 30 degree of electrical degrees, the more weak part in rotor permanent magnet magnetic pole surfaces magnetic field is enhanced to waveform open width value in the increasing magnetic response of rear 30 degree of electrical degrees, thus when making permanent magnetic brushless that armature reaction occur in running, the waveform in rotor permanent magnet magnetic pole surfaces magnetic field is still open width value, also weaken or eliminate the impact that armature reaction is run permanent magnetic brushless thus, this is highly profitable for raising permanent magnetic brushless runnability and quality.
The present invention aims to provide a kind of permanent magnetic brushless rotor of asymmetric magnetic pole, this invention effectively can reduce the adverse effect that permanent magnetic brushless armature reaction is brought, torque ripple reduction, reduces the loss of electric machine, improve the direct torque precision of motor, realize the easy running of motor.
Summary of the invention
The invention provides a kind of permanent magnetic brushless rotor of asymmetric magnetic pole, technical scheme realizes as follows: a kind of permanent magnetic brushless rotor of asymmetric magnetic pole, comprise permanent magnet and rotor core, described rotor core has the hole being connected to motor shaft and the axial groove laying described permanent magnet, it is characterized in that laying permanent magnet in each shaft orientation opening groove forms permanent magnetism magnetic pole, permanent magnet in described permanent magnetism magnetic pole is made up of along rotor direction of rotation three part permanent magnets, it is characterized by: three part permanent magnets show by distributing to weak Surface field by force successively along rotor direction of rotation.
Preferably, the permanent magnetic brushless rotor of this asymmetric magnetic pole, is characterized in that rotor is provided with and places permanent magnet and the shaft orientation opening groove forming permanent magnetism magnetic pole.
Preferably, the permanent magnetic brushless rotor of this asymmetric magnetic pole, is characterized in that permanent magnet is placed in axial groove the permanent magnetism magnetic pole structure forming surface and attach.
Preferably, the permanent magnetic brushless rotor of this asymmetric magnetic pole, is characterized in that the permanent magnet in permanent magnetism magnetic pole is made up of along rotor direction of rotation three part permanent magnets.
Preferably, the permanent magnetic brushless rotor of this asymmetric magnetic pole, is characterized in that three part permanent magnets show by distributing to weak Surface field by force successively along rotor direction of rotation.
Preferably, the permanent magnetic brushless rotor of this asymmetric magnetic pole, three part permanent magnets can be the permanent magnet of same material, different and show and show by by force to the feature of weak Surface field distribution successively along rotor direction of rotation because magnetic Circuit Design.
Preferably, the permanent magnetic brushless rotor of this asymmetric magnetic pole, three part permanent magnets can be the permanent magnet of different materials, show show by by force to the feature of weak Surface field distribution successively along rotor direction of rotation because of the strong and weak feature in the magnetic field of different materials permanent magnet own.
Preferably, the permanent magnetic brushless rotor of this asymmetric magnetic pole, the distribution of permanent magnet along motor direction of rotation all on the datum level being the center of circle with rotor axle center.
Illustrated embodiment of the present invention has following beneficial effect: effectively can reduce the adverse effect that permanent magnetic brushless armature reaction is brought, torque ripple reduction, reduces the loss of electric machine, improves the direct torque precision of motor, realizes the easy running of motor.
In order to further understand feature of the present invention and technology contents, refer to following detailed description for the present invention and accompanying drawing, but institute's accompanying drawing only provides reference and explanation use, is not used for being limited the present invention.
Accompanying drawing explanation
In accompanying drawing:
Fig. 1 is the permanent magnetic brushless rotor structure schematic diagram of the asymmetric magnetic pole of one embodiment of the invention;
Fig. 2 is the permanent magnetic brushless rotor structure schematic diagram of the asymmetric magnetic pole of another embodiment of the present invention;
Fig. 3 is permanent magnetic brushless rotor permanent magnet magnetic pole surfaces distributed wave figure when not implementing of the present invention;
Fig. 4 is permanent magnetic brushless permanent magnetism magnetic pole waviness of the surface distribution map after enforcement the present invention;
Fig. 5 be when not implementing of the present invention permanent magnetic brushless at armature reaction rotor permanent magnetism magnetic pole waviness of the surface distribution map;
Fig. 6 to implement after the present invention permanent magnetic brushless at armature reaction rotor permanent magnetism magnetic pole waviness of the surface distribution map;
Fig. 7 is the iron loss schematic diagram of permanent magnetic brushless when not implementing of the present invention;
Fig. 8 is the iron loss schematic diagram of permanent magnetic brushless after enforcement the present invention;
Fig. 9 is the torque pulsation schematic diagram of permanent magnetic brushless when not implementing of the present invention;
Figure 10 is the torque pulsation schematic diagram of permanent magnetic brushless after enforcement the present invention;
Embodiment
Below in conjunction with accompanying drawing, by the specific embodiment of the present invention describe in detail, will make technical scheme of the present invention and other beneficial effects apparent.
Refer to Fig. 1, the permanent magnetic brushless rotor of the asymmetric magnetic pole of one embodiment of the invention, permanent magnetism magnetic pole 1 is made up of the permanent magnet of three part same material, be respectively: permanent magnet 1, permanent magnet 2, permanent magnet 3, the surface opening groove 5 of rotor core 4, for placing described permanent magnetism magnetic pole 1, rotor core is 6 for connecting the perforate of motor shaft.
Refer to Fig. 2, the permanent magnetic brushless rotor of the asymmetric magnetic pole of another embodiment of the present invention, permanent magnetism magnetic pole 7 is made up of the permanent magnet of three part different materials, be respectively: permanent magnet 8, permanent magnet 9, permanent magnet 10, the surface opening groove 12 of rotor core 11, for placing described permanent magnetism magnetic pole 7, rotor core is 13 for connecting the perforate of motor shaft.
Be no matter the permanent magnetic brushless rotor for the invention process and representative asymmetric magnetic pole described in Fig. 1 or Fig. 2, its permanent magnetism magnetic pole waviness of the surface distribution map as shown in Figure 4.
In the invention process process, when there is armature reaction in permanent magnetic brushless in running, weaken or eliminate armature reaction and the effect of permanent magnetic brushless influence on system operation is embodied both ways: one, permanent magnetic brushless iron loss reduces, and the contrast of Fig. 7 and Fig. 8 can verify implementation result; Two, the torque pulsation of permanent magnetic brushless reduces, and the contrast of Fig. 9 and Figure 10 can verify implementation result.
The above instrument is preferred embodiment of the present invention, and not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the permanent magnetic brushless rotor of an asymmetric magnetic pole, comprise permanent magnet and rotor core, described rotor core has the hole being connected to motor shaft and the axial groove laying described permanent magnet, it is characterized in that laying permanent magnet in each axial groove forms permanent magnetism magnetic pole, permanent magnet in described permanent magnetism magnetic pole is made up of along rotor direction of rotation three part permanent magnets, it is characterized by: three part permanent magnets show by distributing to weak Surface field by force successively along rotor direction of rotation.
2. the permanent magnetic brushless rotor of asymmetric magnetic pole according to claim 1, is characterized in that rotor is provided with and places permanent magnet and the shaft orientation opening groove forming permanent magnetism magnetic pole.
3. the permanent magnetic brushless rotor of asymmetric magnetic pole according to claim 1, is characterized in that permanent magnet is placed in axial groove the permanent magnetism magnetic pole structure forming surface and attach.
4. the permanent magnetic brushless rotor of asymmetric magnetic pole according to claim 1, is characterized in that the permanent magnet in permanent magnetism magnetic pole is made up of along rotor direction of rotation three part permanent magnets.
5. the permanent magnetic brushless rotor of asymmetric magnetic pole according to claim 1, is characterized in that three part permanent magnets show by distributing to weak Surface field by force successively along rotor direction of rotation.
6. the permanent magnetic brushless rotor of asymmetric magnetic pole according to claim 5, three part permanent magnets can be the permanent magnet of same material, different and show and show by by force to the feature of weak Surface field distribution successively along rotor direction of rotation because magnetic Circuit Design.
7. the permanent magnetic brushless rotor of asymmetric magnetic pole according to claim 5, three part permanent magnets can be the permanent magnet of different materials, show show by by force to the feature of weak Surface field distribution successively along rotor direction of rotation because of the strong and weak feature in the magnetic field of different materials permanent magnet own.
8. the permanent magnetic brushless rotor of the asymmetric magnetic pole according to claim 1 to 7 any one, the distribution of permanent magnet along motor direction of rotation all on the datum level being the center of circle with rotor axle center.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201410494316.0A CN104242515A (en) | 2014-09-22 | 2014-09-22 | Permanent-magnet brushless motor rotor with asymmetric magnet poles |
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CN201410494316.0A CN104242515A (en) | 2014-09-22 | 2014-09-22 | Permanent-magnet brushless motor rotor with asymmetric magnet poles |
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CN104242515A true CN104242515A (en) | 2014-12-24 |
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CN201410494316.0A Pending CN104242515A (en) | 2014-09-22 | 2014-09-22 | Permanent-magnet brushless motor rotor with asymmetric magnet poles |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111509884A (en) * | 2019-01-31 | 2020-08-07 | 广东威灵电机制造有限公司 | Rotor and motor with same |
CN113036962A (en) * | 2021-03-10 | 2021-06-25 | 南京航空航天大学 | Low-cost lightweight alternating-pole permanent magnet motor |
WO2021205724A1 (en) * | 2020-04-08 | 2021-10-14 | 日立Astemo株式会社 | Rotor and rotary electric machine |
-
2014
- 2014-09-22 CN CN201410494316.0A patent/CN104242515A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111509884A (en) * | 2019-01-31 | 2020-08-07 | 广东威灵电机制造有限公司 | Rotor and motor with same |
WO2021205724A1 (en) * | 2020-04-08 | 2021-10-14 | 日立Astemo株式会社 | Rotor and rotary electric machine |
CN113036962A (en) * | 2021-03-10 | 2021-06-25 | 南京航空航天大学 | Low-cost lightweight alternating-pole permanent magnet motor |
CN113036962B (en) * | 2021-03-10 | 2022-09-30 | 南京航空航天大学 | Low-cost lightweight alternating-pole permanent magnet motor |
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Application publication date: 20141224 |