CN102856998B - Direct drive motor with sinusoidal surface rotor - Google Patents
Direct drive motor with sinusoidal surface rotor Download PDFInfo
- Publication number
- CN102856998B CN102856998B CN201210306103.1A CN201210306103A CN102856998B CN 102856998 B CN102856998 B CN 102856998B CN 201210306103 A CN201210306103 A CN 201210306103A CN 102856998 B CN102856998 B CN 102856998B
- Authority
- CN
- China
- Prior art keywords
- permanent magnet
- rotor
- curved surface
- motor
- driving motor
- 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.)
- Expired - Fee Related
Links
Landscapes
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention belongs to the field of a motor, and relates to a direct drive motor with sinusoidal surface permanent magnets, solving the problem of large torque fluctuation caused by a simple arc-shaped surface structure of the surface permanent magnet of the rotor of the traditional direct drive motor. The device comprises a motor rotor and a motor stator, wherein the motor stator is provided with a coil winding, the motor rotor comprises a rotor core, and the periphery of the rotor core is uniformly adhered with plate type permanent magnets. The device is characterized in that the inner side faces of the permanent magnets are arc-shaped surface adhered to the surface of the rotor core, the outer side faces of the permanent magnets are three-section curved surfaces, the middle sections of the permanent magnets are arc-shaped surfaces with the same center as the arc-shaped surfaces on the inner side faces, two side sections are curved surfaces which are cut down from the middle to the outer side, and smooth transition is adopted by connection parts of the middle section and the two side sections. The curved surfaces of the outer side faces of the permanent magnets are modified to form the three-section curved surface structure, the magnetic flux density of an air gap can be regulated, and the iron consumption and torque fluctuation of the motor can be reduced.
Description
Technical field
The invention belongs to machine field, relate to the direct driving motor that a kind of rotor adopts sinusoidal profile permanent magnet.
Technical background
Direct driving motor is a kind of motor that adopts direct-connected mode to drive load, in the middle of having removed drive disk assembly as driving belt, gear etc., reduced and driven the failure rate of process, and reduced the demand of installing space.Existing direct driving motor has outside for stator, inner side adopts permanent magnet to be embedded in the form of rotor surface, as the FM DC drive electromotor device for washer of the CN201118416Y patent document record of Patent Office of the People's Republic of China's bulletin on September 17th, 2008, this motor is internal rotor, outer stator structure pattern, and on internal rotor, along the circumferential direction embed equally distributed magnet steel (being permanent magnet), electric machine main shaft is with bindiny mechanism's direct driven washing machine rotating shaft, bindiny mechanism can be the branch sleeve that simultaneously connects electric machine main shaft and washing machine rotating shaft, or realize the driver plate be flexible coupling, connect dish, elastic washer, gasket seat, the external electric machine main shaft end that is arranged on of Hall sensor, by ear wiring board, Hall unit and magnet steel inductive disks form suddenly.The inside and outside arc surface of rotor permanent magnet of tradition said structure direct driving motor is two sections of cambered surfaces of concentric different radii, this shape processing simply can produce larger torque, but torque ripple is larger, cause the speed of service steady not, for making the stable driver of motor that needs of the speed of service increase offset current, both increased the control difficulty of driver, make again motor overall current increase, simultaneously because harmonic wave is serious, increased the iron loss of motor, motor winding temperature rise is increased, the life-span of having reduced motor.
Summary of the invention
The object of the invention is to adopt simple globoidal structure to cause the problem that torque ripple is large for the rotor surface permanent magnet of traditional direct driving motor, a kind of direct driving motor of sinusoidal profile rotor is provided.
The technical solution adopted for the present invention to solve the technical problems is: a kind of direct driving motor with sinusoidal profile rotor, comprise rotor and motor stator, motor stator is provided with coil windings, rotor comprises rotor core, flaky permanent magnet was evenly sticked on rotor core ring week, described permanent magnet medial surface is the cambered surface being sticked on rotor core surface, described permanent magnet lateral surface is syllogic curved surface, interlude is the cambered surface with medial surface cambered surface phase concentric, the curved surface of incision laterally in the middle of the Duan Weicong of both sides, interlude and section junction, both sides seamlessly transit.Permanent magnet lateral surface interlude cambered surface meets the location needs in the permanent magnet course of processing, can effectively reduce difficulty of processing, improve machining accuracy, both sides section incision, be that permanent magnet thickness reduces gradually to both sides, be used for regulating air gap flux density, make the close curve of the magnetic sine curve that is near the mark, to reduce iron loss and torque ripple.
As preferably, described both sides section curved surface is symmetrical mutually.Guarantee the symmetry of the close curve of both sides magnetic, reduce torque ripple.
As preferably, described both sides section curved surface forms for remove material on interlude curved surface basis,
A, first permanent magnet is made into the globoidal structure that medial surface and lateral surface are concentric different radii, with finite element analysis software, obtains airgap density distribution curve;
B, according to the distribution map in a, draw corresponding standard sine distribution curve;
Two curve deviation maximums that c, selecting step a, b determine are the starting point of both sides section curved surface, calculate each electrical degree corresponding to each permanent magnet starting point place
(
,
), wherein
for motor number of pole-pairs, the both sides section curved surface of each permanent magnet and the mechanical angle of interlude cambered surface junction
(
);
D, in both sides section curved surface starting point to evenly choosing K point between curved surface terminal, the excision amount of both sides section curved surface can be calculated as follows, in formula
represent original permanent magnet thickness,
represent air gap,
represent that in a step, airgap density distribution curve exists
(
,
) locate the close value of corresponding magnetic,
for b step Plays Sine distribution curve exists
locate the corresponding close value of magnetic, be calculated as follows the excision amount that can obtain each point
,
。
As other replacement scheme, both sides section curved surface can be elliptical arc surface or arc surface.Adopt ordinary curve sizing both end sides curved surface also can play the effect that reduces torque ripple, calculate and sizing simple, process more easyly, still to compare deviation larger with the close distribution curve of magnetic and standard sine distribution curve.
As preferably, in described steps d, K value is more than or equal to 10.According to accuracy requirement, choose and count, calculate after the excision amount of each point, by each point smooth connection, form both sides section curved surface.
As preferably, described permanent magnet medial surface and lateral surface interlude cambered surface and rotor core concentric.
As preferably, adjacent permanent magnet magnetic pole is alternately distributed.
As preferably, described permanent magnet is sheet magnet steel.
As preferably, described rotor core is annular, adopts sectionally smooth join or powder metallurgy or is reeled and formed by strip iron core.
The present invention revises permanent magnet lateral surface curved surface, forms the curved-surface structure of syllogic, regulates air gap flux density, is the close distribution curve of the magnetic Sine distribution curve that is near the mark, and has reduced iron loss and motor torque fluctuation.
Accompanying drawing explanation
Fig. 1 is rotor stator structural representation of the present invention.
Fig. 2 is the schematic diagram of rotor core structure of the present invention.
Fig. 3 is conventional permanent magnet structural representation of the present invention.
Fig. 4 is a kind of magnet structure schematic diagram of the present invention.
Fig. 5 is the close distribution curve of magnetic and standard sine distribution curve contrast schematic diagram before permanent magnet correction of the present invention.
Fig. 6 is the close distribution curve of magnetic and standard sine distribution curve contrast schematic diagram after permanent magnet correction of the present invention.
In figure: 1. motor stator, 2. rotor core, 3 '. conventional permanent magnet, 3. permanent magnet, 3a. left side section curved surface, 3b. stage casing curved surface, 3c. right side section curved surface, 4. standard sine distribution curve, 5. revises front airgap density distribution curve, airgap density distribution curve after 6. revising.
Embodiment
Below by specific embodiment, also the present invention is further described by reference to the accompanying drawings.
Embodiment: a kind of direct driving motor with sinusoidal profile rotor, as shown in Figure 1 and Figure 2.This device comprises motor stator 1 and rotor, and motor stator 1 is looped around rotor outside, and motor stator 1 is provided with coil windings.Rotor comprises the rotor core 2 of ring-type, and rotor core 2 is reeled and formed by strip iron core, the permanent magnet 3 that has evenly been sticked on the excircle of rotor core 2, and adjacent permanent magnet pole orientation is contrary, and each permanent magnet N utmost point and the S utmost point are alternately arranged on rotor core 2.
Conventional permanent magnet 3 ' as shown in Figure 3, the cambered surface that medial surface and lateral surface are concentric different radii.The permanent magnet 3 of this device as shown in Figure 4, medial surface is the circular arc concentric with rotor core 2, lateral surface is syllogic curved-surface structure respectively, stage casing curved surface 3b is the cambered surface with the concentric different radii of medial surface, left side section curved surface 3a and right side section curved surface 3c are symmetrical, left side section curved surface 3a and right side section curved surface 3c incision laterally, i.e. permanent magnet 3 thickness attenuation gradually to both sides.
Permanent magnet 3 curved-surface structures of this device can be removed material correction and obtain on the basis of conventional permanent magnet 3 '.As shown in Figure 5, step is as follows:
A, first permanent magnet is made into the globoidal structure that medial surface and lateral surface are concentric different radii, with finite element analysis software obtain revise before airgap density distribution curve 5;
B, according to the distribution map in a, draw corresponding standard sine distribution curve 4;
Two curve deviation maximums that c, selecting step a, b determine are the starting point of both sides section curved surface, calculate each electrical degree corresponding to each permanent magnet starting point place
(
,
), wherein
for motor number of pole-pairs, the both sides section curved surface of each permanent magnet and the mechanical angle of interlude cambered surface junction
(
);
D, in both sides section curved surface starting point to evenly choosing K point between curved surface terminal, the excision amount of both sides section curved surface can be calculated as follows, in formula
represent original permanent magnet thickness,
represent air gap,
represent that in a step, airgap density distribution curve exists
(
,
) locate the close value of corresponding magnetic,
for b step Plays Sine distribution curve exists
locate the corresponding close value of magnetic, be calculated as follows the excision amount that can obtain each point
,
。
As shown in Figure 6, by above-mentioned steps to permanent magnet 3 curve form corrections after airgap density distribution curve 6 high with standard sine distribution curve 4 degrees of approach, improved the torque ripple of motor.
Claims (7)
1. a direct driving motor with sinusoidal profile rotor, comprise rotor and motor stator, motor stator is provided with coil windings, rotor comprises rotor core, flaky permanent magnet was evenly sticked on rotor core ring week, it is characterized in that: described permanent magnet medial surface is the cambered surface being sticked on rotor core surface, described permanent magnet lateral surface is syllogic curved surface, interlude is the cambered surface with medial surface cambered surface phase concentric, the curved surface of incision laterally in the middle of the Duan Weicong of both sides, interlude and section junction, both sides seamlessly transit;
Described both sides section curved surface forms for remove material on interlude curved surface basis,
A, first permanent magnet is made into the globoidal structure that medial surface and lateral surface are concentric different radii, with finite element analysis software, obtains airgap density distribution curve;
B, according to the distribution map in a, draw corresponding standard sine distribution curve;
Two curve deviation maximums that c, selecting step a, b determine are the starting point of both sides section curved surface, calculate each electrical degree corresponding to each permanent magnet starting point place
,
,
, wherein
for motor number of pole-pairs, the both sides section curved surface of each permanent magnet and the mechanical angle of interlude cambered surface junction
,
;
D, in both sides section curved surface starting point to evenly choosing K point between curved surface terminal, the excision amount of both sides section curved surface can be calculated as follows, in formula
represent original permanent magnet thickness,
represent air gap,
represent that in a step, airgap density distribution curve exists
locate the corresponding close value of magnetic,
,
,
for the close distribution curve of b step Plays sine magnetic exists
locate the corresponding close value of magnetic, be calculated as follows the excision amount that can obtain each point
,
。
2. a kind of direct driving motor with sinusoidal profile rotor according to claim 1, is characterized in that: described both sides section curved surface is symmetrical mutually.
3. a kind of direct driving motor with sinusoidal profile rotor according to claim 1, is characterized in that: in described steps d, K value is more than or equal to 10.
4. a kind of direct driving motor with sinusoidal profile rotor according to claim 1 and 2, is characterized in that: described permanent magnet medial surface and lateral surface interlude cambered surface and rotor core concentric.
5. a kind of direct driving motor with sinusoidal profile rotor according to claim 1 and 2, is characterized in that: adjacent permanent magnet magnetic pole is alternately distributed.
6. a kind of direct driving motor with sinusoidal profile rotor according to claim 1 and 2, is characterized in that: described permanent magnet is sheet magnet steel.
7. a kind of direct driving motor with sinusoidal profile rotor according to claim 1 and 2, is characterized in that: described rotor core is annular, adopts sectionally smooth join or powder metallurgy or is reeled and formed by strip iron core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210306103.1A CN102856998B (en) | 2012-08-27 | 2012-08-27 | Direct drive motor with sinusoidal surface rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210306103.1A CN102856998B (en) | 2012-08-27 | 2012-08-27 | Direct drive motor with sinusoidal surface rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102856998A CN102856998A (en) | 2013-01-02 |
| CN102856998B true CN102856998B (en) | 2014-09-17 |
Family
ID=47403288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210306103.1A Expired - Fee Related CN102856998B (en) | 2012-08-27 | 2012-08-27 | Direct drive motor with sinusoidal surface rotor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102856998B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2378634A1 (en) * | 2010-04-13 | 2011-10-19 | Siemens Aktiengesellschaft | Electrical machine and permanent-magnet |
| CN102545436A (en) * | 2012-02-08 | 2012-07-04 | 中国科学院电工研究所 | Magnetic pole structure of permanent magnet synchronous direct-driven motor and design method thereof |
| CN202798217U (en) * | 2012-08-27 | 2013-03-13 | 杭州娃哈哈非常可乐饮料有限公司 | Direct-drive motor with sinusoidal-profile rotor |
-
2012
- 2012-08-27 CN CN201210306103.1A patent/CN102856998B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2378634A1 (en) * | 2010-04-13 | 2011-10-19 | Siemens Aktiengesellschaft | Electrical machine and permanent-magnet |
| CN102545436A (en) * | 2012-02-08 | 2012-07-04 | 中国科学院电工研究所 | Magnetic pole structure of permanent magnet synchronous direct-driven motor and design method thereof |
| CN202798217U (en) * | 2012-08-27 | 2013-03-13 | 杭州娃哈哈非常可乐饮料有限公司 | Direct-drive motor with sinusoidal-profile rotor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102856998A (en) | 2013-01-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10348141B2 (en) | Motor with rotor and stator dimensions for reducing cogging torque and torque ripple | |
| EP1509988B1 (en) | Rotary permanent magnet electric motor having stator pole shoes of varying dimensions | |
| CN104716760B (en) | Rotary motor | |
| CN102931795A (en) | Motor structure | |
| CN101980433A (en) | Circumferentially phase-shifted and axially segmented wedge-shaped stator core external permanent magnet rotor synchronous motor | |
| CN103929026B (en) | Magneto | |
| JP5609844B2 (en) | Electric motor | |
| JP2014060837A (en) | Axial gap type rotary electric machine, electrically-driven wheel chair with the rotary electric machine, and electrically-driven bicycle | |
| WO2021022920A1 (en) | Rotor assembly and consequent-pole motor | |
| WO2021109294A1 (en) | Permanent magnet synchronous electric motor | |
| JP2013115899A (en) | Rotor of permanent magnet type motor, manufacturing method of the same, and permanent magnet type motor | |
| CN105305748B (en) | Magneto | |
| CN202798217U (en) | Direct-drive motor with sinusoidal-profile rotor | |
| JP2011172359A (en) | Split rotor and electric motor | |
| CN202395636U (en) | Low speed high thrust density linear motor | |
| CN100508335C (en) | A transverse magnetic field permanent magnet synchronous motor with a three-wall structure of rotor poles | |
| CN102856998B (en) | Direct drive motor with sinusoidal surface rotor | |
| WO2015051571A1 (en) | Magnetic circuit structure of dc brushless motor and permanent magnet embedded rotor thereof | |
| CN210093089U (en) | A permanent magnet joint direct drive motor with hall plate assembly | |
| US20120112598A1 (en) | Electrical machine stator assembly | |
| CN102347669A (en) | Limited angle torque motor and method for manufacturing same | |
| CN102185447B (en) | Novel inner rotor permanent magnet motor | |
| JP2011199918A (en) | Permanent-magnet electric motor | |
| CN108964391A (en) | A kind of pole 6n/5n on-off reluctance motor with sectional rotor | |
| CN203027044U (en) | Compressor and permanent magnet motor rotor device for compressor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140917 |