CN105099026A - Virtual slot rotor of embedded permanent magnet motor - Google Patents
Virtual slot rotor of embedded permanent magnet motor Download PDFInfo
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- CN105099026A CN105099026A CN201410219871.2A CN201410219871A CN105099026A CN 105099026 A CN105099026 A CN 105099026A CN 201410219871 A CN201410219871 A CN 201410219871A CN 105099026 A CN105099026 A CN 105099026A
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Abstract
Provided is a virtual slot rotor of an embedded permanent magnet motor. An even number of magnetic steel slots are distributed on a rotor punching sheet of the virtual slot rotor uniformly. A magnetic steel is embedded in each magnetic steel slot. The magnetic steels are arranged at intervals according to the N pole and the S pole, and each rotor pole is equipped with at least two recessed grooves at the cylindrical part of the punching sheet. Through design of the recessed groove, the cogging torque and the torque ripple can be lowered effectively. When the mode is compared with other cogging torque and torque ripple weakening modes, weakening of the magnetic flux and the counterelectromotive force can be neglected, and the motor power density is kept effectively.
Description
Technical field
The present invention relates to motor, particularly relate to a kind of empty groove rotor of built-in permanent magnetic motor.
Background technology
Magneto to be obtained in a lot of field with the advantage of its high efficiency, high power density and to apply widely, such as industrial servo field, automobile drive motor field etc.But magneto, owing to fixing in magnetic field, thus understand the cogging torque that be formed because of the impact of fluting under no-load condition, and under designing irrational situation, torque pulsation also can be larger.In automobile drive motor field, serious cogging torque and the existence of torque pulsation not only can cause the problem on whole structure, and can bring the shake of vehicle, also can bring noise problem, have a strong impact on the riding comfort of vehicle.
Solving the technical elements of cogging torque and torque pulsation, traditional common technique often has following several:
1) the sinusoidal air gap technology of rotor;
By changing the profile of rotor, by air gap magnetic density waveform sineization, weakened field harmonic wave, thus weaken cogging torque and torque pulsation;
2) stator tooth shape optimum technology;
Here there is a lot of technical scheme, comprise stator tooth top and make non-homogeneous air gap; Stator tooth backs down groove; Size tooth technology; Do not wait notch technology etc.;
3) skewed stator slot technology;
By certain angle was turned round in stator core, thus cause cancelling out each other of particular harmonic, thus weaken cogging torque and torque pulsation;
4) skewed-rotor technology;
The principle of skewed stator slot being applied on rotor magnetic pole is exactly skewed-rotor technology.Here, except the oblique pole technology of routine, also have segmentation oblique pole technology, it can realize cancelling out each other of particular harmonic equally by less segments.Although with queue oblique pole technology has certain difference, its principle is all harmonic cancellation;
6) asymmetric magnetic pole technology
Multiple magnetic pole is made dissymmetrical structure, causes cancelling out each other of tangential force in a circumferential direction, thus reduce cogging torque and the torque pulsation of motor, but this technology often causes the radial load of motor excessive, thus cause extra noise and vibration problem.
Make a general survey of the principle of these technology application, substantially all nothing more than two kinds, one is weakened by magnetic field harmonics; Two is utilize harmonic cancellation technology.But these two kinds of technology itself all to magnetic flux and back-emf first-harmonic generation weakening to a certain degree, can be reflected in motor torque and export the loss just had to a certain degree, thus affect torque density, the power density of motor.Apply these two kinds of principles while weakening cogging torque and torque pulsation, ensure that magnetic flux does not weaken and be difficult to accomplish.
Except these six kinds of technology above-mentioned, also have the most basic a kind of cogging torque and Torque Ripple Optimization mode: rotor pole arc coefficient is optimized.It, by changing pole embrace thus the distribution in change air gap flux density and rotor magnetic field, changes the tangential force size of ad-hoc location between rotor.This is that one is the most basic, but least attract attention technology.Although it can play weaken the effect of cogging torque, also there is a great problem, namely there is great contradiction between the size of cogging torque and required magnetic flux.Optimize pole embrace when obtaining minimum cogging torque, the result of the magnetic flux, torque, power density etc. of motor but non-optimal, this causes the problem being difficult to coordinate just to design motor.How this problem is solved, just can well take into account power density and cogging torque.
Summary of the invention
Object of the present invention, exactly in order to solve on the basis of cutting down cogging torque and torque pulsation, does not affect the problem of torque density and power density as far as possible.Avoid pole embrace and the contradiction between magnetic flux, torque and power density occur simultaneously.
In order to achieve the above object, present invention employs following technical scheme: a kind of empty groove rotor of built-in permanent magnetic motor, its rotor punching is evenly distributed with the magnet steel groove that even number is axially through, magnet steel is embedded with respectively in each magnet steel groove, each magnet steel presses N pole S interpolar every setting, and each rotor pole is respectively equipped with at least two grooves at punching cylindrical position.The each rotor pole of described rotor core is respectively equipped with at least two grooves at punching cylindrical position, and the plural groove that each rotor pole of described rotor core is provided with at punching cylindrical position is symmetrical relative to pole center line.Adjust the distribution that the position of these grooves, width and the degree of depth can change air-gap field, just can change cogging torque and torque pulsation.Suitable position, width and the degree of depth is selected can effectively to reduce cogging torque and torque pulsation.And due to these grooves narrow and shallow, therefore very little on the impact of magnetic flux, also can ignore the impact of torque density and power density.
What the present invention was more satisfactory solve weaken cogging torque while, do not weaken the problem of magnetic flux, torque density and power density.Relative to other cogging torques and torque pulsation crippled mode, the weakening of the present invention to magnetic flux and back-emf can be ignored, and effectively maintains the power density of motor.And the use of this technology will, by the restriction of pole embrace, with magnetic flux, torque and power density in the preferred situation of optimization aim pole embrace, can utilize the technology of the present invention to reach the weakening of cogging torque and torque pulsation equally.
In essence, the principle of principle of the present invention and pole embrace optimisation technique is similar, it should have the Distribution of Magnetic Field when larger magnetic force under changing original even air gap by the groove increased on rotor, thus changes size and the frequency of gravitation between rotor.But this technology can not by the restriction of pole embrace, thus the design of pole embrace can magnetic flux, torque and power density be objective optimization, and need not consider the impact of pole embrace on cogging torque.
From presentation, after adding groove, magnetic field harmonics still exists, but its existence changes stator teeth notching impact to the curve of rotor drawing force with change in location, thus serves the effect changing cogging torque and torque pulsation.
Accompanying drawing explanation
Fig. 1 is the overall perspective view of the empty groove rotor of built-in permanent magnetic motor of the present invention;
Fig. 2 is the partial elevational structural representation of the empty groove rotor of built-in permanent magnetic motor of the present invention.
Embodiment
See Fig. 1, coordinate see Fig. 2, the empty groove rotor of built-in permanent magnetic motor of the present invention, its rotor punching 1 is evenly distributed with the magnet steel groove 2 that even number is axially through, magnet steel 3 is embedded with respectively in each magnet steel groove, each magnet steel 3 presses N pole S interpolar every setting, and each rotor pole is respectively equipped with at least two grooves 4 at punching cylindrical position.
As shown in Figure 2, groove 4, two groove being respectively equipped with two at each rotor pole at punching cylindrical position is symmetrical relative to pole center line for one embodiment of the invention.
Claims (2)
1. the empty groove rotor of a built-in permanent magnetic motor, its rotor punching is evenly distributed with the magnet steel groove that even number is axially through, magnet steel is embedded with respectively in each magnet steel groove, each magnet steel presses N pole S interpolar every setting, it is characterized in that: each rotor pole of described rotor core is respectively equipped with at least two grooves at punching cylindrical position.
2. the empty groove rotor of built-in permanent magnetic motor as claimed in claim 1, it is characterized in that: each rotor pole of described rotor core is respectively equipped with at least two grooves at punching cylindrical position, and the plural groove that each rotor pole of described rotor core is provided with at punching cylindrical position is symmetrical relative to pole center line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410219871.2A CN105099026A (en) | 2014-05-22 | 2014-05-22 | Virtual slot rotor of embedded permanent magnet motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410219871.2A CN105099026A (en) | 2014-05-22 | 2014-05-22 | Virtual slot rotor of embedded permanent magnet motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105099026A true CN105099026A (en) | 2015-11-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410219871.2A Pending CN105099026A (en) | 2014-05-22 | 2014-05-22 | Virtual slot rotor of embedded permanent magnet motor |
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| CN (1) | CN105099026A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377858A (en) * | 2014-12-10 | 2015-02-25 | 安徽巨一自动化装备有限公司 | Novel motor rotor structure |
| CN109428414A (en) * | 2017-08-25 | 2019-03-05 | 上海电驱动股份有限公司 | A kind of by-pass shunt formula permanent magnet |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201097440Y (en) * | 2006-10-10 | 2008-08-06 | 杭州英迈克电子有限公司 | A rotor for brushless permanent magnetic motor |
| JP2008206308A (en) * | 2007-02-20 | 2008-09-04 | Toyota Industries Corp | Permanent-magnet rotating electric machine |
| CN203933190U (en) * | 2014-05-22 | 2014-11-05 | 上海电驱动股份有限公司 | The empty groove rotor of built-in permanent magnetic motor |
-
2014
- 2014-05-22 CN CN201410219871.2A patent/CN105099026A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201097440Y (en) * | 2006-10-10 | 2008-08-06 | 杭州英迈克电子有限公司 | A rotor for brushless permanent magnetic motor |
| JP2008206308A (en) * | 2007-02-20 | 2008-09-04 | Toyota Industries Corp | Permanent-magnet rotating electric machine |
| CN203933190U (en) * | 2014-05-22 | 2014-11-05 | 上海电驱动股份有限公司 | The empty groove rotor of built-in permanent magnetic motor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377858A (en) * | 2014-12-10 | 2015-02-25 | 安徽巨一自动化装备有限公司 | Novel motor rotor structure |
| CN109428414A (en) * | 2017-08-25 | 2019-03-05 | 上海电驱动股份有限公司 | A kind of by-pass shunt formula permanent magnet |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151125 |