CN201349148Y - Low-torque ripple brushless direct-current motor - Google Patents
Low-torque ripple brushless direct-current motor Download PDFInfo
- Publication number
- CN201349148Y CN201349148Y CNU2008201570303U CN200820157030U CN201349148Y CN 201349148 Y CN201349148 Y CN 201349148Y CN U2008201570303 U CNU2008201570303 U CN U2008201570303U CN 200820157030 U CN200820157030 U CN 200820157030U CN 201349148 Y CN201349148 Y CN 201349148Y
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- motor
- torque ripple
- permanent magnet
- brushless direct
- current motor
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- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
The utility model provides a low-torque ripple brushless direct-current motor, which comprises a stator and a rotor; wherein the stator comprises stator windings; the rotor comprises permanent magnets; and the permanent magnet under each magnetic pole is sectionally arranged according to the phase number of the stator windings. The technical scheme provided by the utility model can ensure that the air gap flux density waves are sectioned square waves; when the square wave current is interacted with the air gap flux density of the sectioned square waves, the range between the maximum value and the minimum value of the output torque can be greatly reduced, and thereby the torque ripple of the motor is effectively inhibited; the utility model greatly reduces the torque ripple of the brushless direct-current motor and can promote the application of the brushless direct-current motor in a high-precision, high-performance servo system and advance the development of the manufacturing and related industries of the brushless direct-current motor.
Description
Technical field
The utility model relates to a kind of brshless DC motor, particularly relates to a kind of brshless DC motor of low torque ripple, belongs to the processed and applied field of brshless DC motor.
Background technology
Brshless DC motor relies on the stator field of square wave current commutation generation and the square wave air-gap field interaction work that permanent magnet produces, and has multiple torque pulsation: the torque ripple that torque ripple, armature reaction and the mechanical technology that the torque ripple that the torque ripple that the torque ripple that electromagnetic factors causes, harmonic wave cause, slot effect cause, electric current commutation cause causes etc.The torque pulsation meeting brings some adverse effects to the operation of brshless DC motor, for example audible noise, loss in efficiency, and increase component wear etc.
Therefore, be necessary to reduce the torque pulsation of brshless DC motor,, can effectively reduce the torque ripple that electromagnetic factors, electric current commutation, teeth groove, armature reaction and mechanical technology etc. cause by optimizing Current Control, design of electrical motor and improvement manufacturing process.For example, Chinese patent application has disclosed a kind of torque pulsation that commutation is brought at electric current No. 200310122909.6, and motor is carried out improved technical scheme; Chinese patent application has then disclosed for No. 200620043381.2 a kind of at the caused torque pulsation of slot effect, and motor is carried out improved technical scheme.But generally speaking, these reduce the torque ripple that electric current commutation, teeth groove, armature reaction and mechanical technology etc. cause by optimizing Current Control, design of electrical motor and improvement manufacturing process, exist algorithm complexity, progress to be limited by correlation technique and fresh water (FW) equality shortcoming, so effect is limited.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of brshless DC motor that can greatly reduce the torque pulsation of motor is provided, and promotes that brshless DC motor is applied to high accuracy, high performance servo system.
For achieving the above object, the utility model adopts following technical scheme:
A kind of brshless DC motor of low torque ripple comprises stator and rotor, and described stator comprises stator winding, and described rotor comprises permanent magnet, and this permanent magnet is to carry out segmentation by the number of phases of stator winding to arrange.
The hop count that described permanent magnet carries out being had after segmentation is arranged equals the number of poles of motor, and the piece number of the permanent magnet that every section permanent magnet had equals the number of phases of motor.
By being carried out segmentation by the number of phases of stator winding, arranges the permanent magnet under each magnetic pole, it is the segmentation square wave that technical scheme provided by the utility model can make the air gap flux density waveform, the air gap flux density of square wave current and segmentation square wave is done the time spent can dwindle the output maximum of torque and the scope of minimum value greatly, thus good restraining the torque pulsation of motor.
The reduction of the torque pulsation of the utility model brshless DC motor is promptly optimized the air-gap field design from motor body design, breaks through the method for traditional design technology reduction torque pulsation from Current Control and motor, has simplified control algolithm.
The utility model has greatly reduced the torque pulsation of brshless DC motor, can promote brshless DC motor to be applied to high accuracy, high performance servo system, can promote the development of brshless DC motor manufacturing and relevant industries thereof.
Description of drawings
Accompanying drawing 1 is the structural representation of the brshless DC motor of the utility model low torque ripple.
Among the figure, 1, stator, 11, stator winding, 2, rotor, 21, permanent magnet.
Embodiment
Provide embodiment of the present utility model below in conjunction with accompanying drawing.
Referring to accompanying drawing 1.This figure shows the structural representation of the brshless DC motor of the utility model low torque ripple.As shown in the figure, the brshless DC motor of low torque ripple provided by the utility model comprises stator 1 and rotor 2, and described stator 1 comprises stator winding 11, and described rotor 2 comprises permanent magnet 21.Need to prove, permanent magnet 21 under each magnetic pole, be to carry out segmentation by the number of phases of stator winding 11 to arrange, the hop count that permanent magnet carries out being had after segmentation is arranged equals the number of poles of motor, and the piece number of the permanent magnet that every section permanent magnet had equals the number of phases of motor.Consult Fig. 1 once more, this figure adopts face subsides formula 18 grooves 2 utmost points 3 phase permanent-magnet brushless direct current machines to carry out example, and among this figure, all permanent magnets 21 are divided into two sections, and every section has three permanent magnets.In actual the manufacturing, to the number of poles of motor and the number of phases all without limits, permanent magnet is carried out similar processing, just can reduce the torque pulsation of brshless DC motor greatly according to the number of poles and the number of phases of motor.
Technical scheme provided by the utility model, by being carried out segmentation by the number of phases of stator winding, arranges the permanent magnet under each magnetic pole, can make the air gap flux density waveform is the segmentation square wave, the air gap flux density of square wave current and segmentation square wave is made the maximum of dwindling the output torque that the time spent can be bigger and the scope of minimum value, thereby suppresses the torque pulsation of motor well.
Technical scheme provided by the utility model from motor body design, by optimizing the air-gap field design, has broken through and traditional has reduced the method for torque pulsation from the design technology of Current Control and motor, has simplified control algolithm.The utility model has solved the problem that all the time is outstanding: the permanent magnet of each magnetic pole of prior art scheme is a monoblock permanent magnet, the air gap flux density waveform is a square wave, if thoroughly eliminate the torque pulsation that electromagnetic factors causes, requiring the width of square wave is a pole span, just pole embrace is 1, but be limited to assembling and manufacturing technology level when front motor, the scope of pole embrace is 0.6～0.8, therefore causes more serious torque ripple; Though there is the scholar to propose square wave current is carried out the torque pulsation that the modulation eliminating electromagnetic factors causes, increased the complexity of algorithm, actual being not easy accomplished.
The utility model has greatly reduced the torque pulsation of brshless DC motor, can promote brshless DC motor to be applied to high accuracy, high performance servo system, can promote the development of brshless DC motor manufacturing and relevant industries thereof.
Claims (3)
1. the brshless DC motor of a low torque ripple comprises stator and rotor, and described stator comprises stator winding, and described rotor comprises permanent magnet, it is characterized in that: the permanent magnet under each magnetic pole is to carry out segmentation by the number of phases of stator winding to arrange.
2. the brshless DC motor of low torque ripple according to claim 1 is characterized in that: described permanent magnet carries out segmentation and arranges the number of poles that hop count that the back had equals motor.
3. the brshless DC motor of low torque ripple according to claim 1, it is characterized in that: the piece number of the permanent magnet that every section permanent magnet had equals the number of phases of motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201570303U CN201349148Y (en) | 2008-12-12 | 2008-12-12 | Low-torque ripple brushless direct-current motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201570303U CN201349148Y (en) | 2008-12-12 | 2008-12-12 | Low-torque ripple brushless direct-current motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201349148Y true CN201349148Y (en) | 2009-11-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201570303U Expired - Fee Related CN201349148Y (en) | 2008-12-12 | 2008-12-12 | Low-torque ripple brushless direct-current motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201349148Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789737B (en) * | 2010-02-03 | 2012-02-08 | 薛晓明 | Method and device for inhibiting electromagnetic torque pulsation of brushless direct-current motor |
-
2008
- 2008-12-12 CN CNU2008201570303U patent/CN201349148Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789737B (en) * | 2010-02-03 | 2012-02-08 | 薛晓明 | Method and device for inhibiting electromagnetic torque pulsation of brushless direct-current motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Shanghai Fuyun Conveyig Machinery Co., Ltd. Assignor: Shanghai Dianji University Contract record no.: 2010310000110 Denomination of utility model: Low-torque ripple brushless direct-current motor Granted publication date: 20091118 License type: Exclusive License Record date: 20100716 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091118 Termination date: 20141212 |
|
| EXPY | Termination of patent right or utility model |