CN104283394A - Surface-mounted-type brushless direct current motor rotor for restraining permanent magnet demagnetization - Google Patents
Surface-mounted-type brushless direct current motor rotor for restraining permanent magnet demagnetization Download PDFInfo
- Publication number
- CN104283394A CN104283394A CN201410557787.1A CN201410557787A CN104283394A CN 104283394 A CN104283394 A CN 104283394A CN 201410557787 A CN201410557787 A CN 201410557787A CN 104283394 A CN104283394 A CN 104283394A
- Authority
- CN
- China
- Prior art keywords
- permanent magnet
- motor
- motor rotor
- demagnetization
- direct current
- 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.)
- Pending
Links
Landscapes
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention provides a surface-mounted-type brushless direct current motor rotor for restraining permanent magnet demagnetization. The surface-mounted-type brushless direct current motor rotor comprises a plurality of magnetic poles. Each magnetic pole is composed of a first permanent magnet and a second permanent magnet, wherein the first permanent magnet and the second permanent magnet have different demagnetization resistant capacities, and the demagnetization resistant capacity of the first permanent magnet is larger than that of the second permanent magnet. According to the surface-mounted-type brushless direct current motor for restraining permanent magnet demagnetization, a demagnetization reaction caused by an armature reaction of a brushless direct current motor is restrained, the output torque of the motor is improved, torque ripples of the motor are reduced, and the short-time overload operating capacity and the rapid starting capacity of the motor are improved.
Description
Technical field
The face that the present invention relates to mounted brshless DC motor motor body design field, and in particular to the mounted brushless DC motor rotor in a kind of face suppressing permanent magnet to demagnetize, for the anti-degaussing problem that the armature reaction solved due to face mounted brushless dc electric motor causes, the Driving Torque of motor can be improved, reduce its torque ripple, improve the short-time overload serviceability of motor and start ability fast.
Background technology
During balanced load, the impact that armature magnetomotive force produces main pole magnetic field first-harmonic, this phenomenon is called armature reaction.When do not have in armature winding electric current by time, the magnetic field formed by magnetic pole is called main field, approximate by sinusoidal rule distribution.When have in armature winding electric current by time, winding itself produce a magnetic field, be called armature field.Armature field will make main field distort to the effect of main field, produce armature reaction.
The pole design of usual brushless DC motor adopts the permanent magnet of the same material trade mark of the same race, and air gap flux density waveform is square wave when zero load.Due to the impact of armature reaction during load, air gap flux density is decline under half magnetic pole, is strengthen, considers the saturated of magnetic circuit under other half magnetic pole, and every pole magnetic flux declines.
The Ci Jianchu of the permanent magnet that air gap flux density decline place is corresponding very easily causes irreversible demagnetization, and motor Driving Torque is declined, and torque ripple increases simultaneously, and the vibration noise of motor increases.
The demagnetization caused to suppress armature reaction, the maximum current of also mainly restrictions motor during the design of brushless DC motor, and calculate thus and determine the MIN thickness of magnet steel.This adds the consumption of permanent magnetic material undoubtedly, also constrains the short-time overload serviceability of motor.
In sum, currently available technology has the following disadvantages: 1. the loss of excitation of permanent magnet local makes motor Driving Torque decline; 2. when the loss of excitation of permanent magnet local also makes load, air gap flux density waveform distorts, and torque ripple is increased, the vibration noise increase of motor; 3. brushless DC motor suppresses armature reaction to cause the design of demagnetization to add the consumption of permanent magnetic material, is very uneconomic; 4. motor running limit maximum current, reduces the short-time overload serviceability of motor and quick startup ability.
Summary of the invention
The present invention proposes the mounted brushless DC motor rotor in a kind of face suppressing permanent magnet to demagnetize, the demagnetization reaction that brushless DC motor armature reaction causes is suppressed, improve the Driving Torque of motor, reduce the torque ripple of motor, improve the short-time overload serviceability of motor and start ability fast.
In order to achieve the above object, the present invention proposes the mounted brushless DC motor rotor in a kind of face suppressing permanent magnet to demagnetize, comprise: multiple magnetic pole, described each magnetic pole is made up of the first permanent magnet and the second permanent magnet, and described first permanent magnet and the second permanent magnet have different anti-degaussing abilities; Wherein, the anti-degaussing ability of described first permanent magnet is greater than the anti-degaussing ability of described second permanent magnet.
Further, the magnetic energy product of described first permanent magnet exceeds the magnetic energy product 10% ~ 20% of the second permanent magnet.
Further, the magnetic energy product of described first permanent magnet exceeds the magnetic energy product 15% of the second permanent magnet.
Further, described first permanent magnet and the second permanent magnet adopt the permanent magnet of the permanent magnet of different materials or the different trade mark.
Further, described first permanent magnet is positioned at the region that armature reaction causes permanent magnet to demagnetize.
Further, described second permanent magnet is positioned at the region that armature reaction causes permanent magnet increasing magnetic.
Further, the quantity of described multiple magnetic pole is even number and is symmetrically distributed on rotor.
The mounted brushless DC motor rotor in face of the suppression permanent magnet demagnetization that the present invention proposes, the demagnetizing effect that can cause armature reaction in brushless DC motor plays certain inhibitory action, improve the utilance of permanent magnet, enhance the Driving Torque of motor, and reduce the torque ripple of motor; Meet the short-time overload serviceability of motor and quick startup ability, improve the performance of motor, facilitate the application of brushless DC motor.
Accompanying drawing explanation
Figure 1 shows that the mounted brushless DC motor rotor structural representation in face of the suppression permanent magnet demagnetization of present pre-ferred embodiments.
Embodiment
Provide the specific embodiment of the present invention below in conjunction with accompanying drawing, but the invention is not restricted to following execution mode.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts the form that simplifies very much and all uses non-ratio accurately, only for object that is convenient, the aid illustration embodiment of the present invention lucidly.
Please refer to Fig. 1, Figure 1 shows that the mounted brushless DC motor rotor structural representation in face of the suppression permanent magnet demagnetization of present pre-ferred embodiments.The present invention proposes the mounted brushless DC motor rotor 100 in a kind of face suppressing permanent magnet to demagnetize, comprise: multiple magnetic pole 200, described each magnetic pole 200 is made up of the first permanent magnet 300 and the second permanent magnet 400, and described first permanent magnet 300 and the second permanent magnet 400 have different anti-degaussing abilities; Wherein, the anti-degaussing ability of described first permanent magnet 300 is greater than the anti-degaussing ability of described second permanent magnet 400.
According to present pre-ferred embodiments, the magnetic energy product of described first permanent magnet exceeds the magnetic energy product 10% ~ 20% of the second permanent magnet, and further, the magnetic energy product of described first permanent magnet exceeds the magnetic energy product about 15% of the second permanent magnet.Further, described first permanent magnet 300 and the second permanent magnet 400 adopt the permanent magnet of the permanent magnet of different materials or the different trade mark.Further, described first permanent magnet 300 is positioned at the region that armature reaction causes permanent magnet to demagnetize, and described second permanent magnet 400 is positioned at armature reaction and causes permanent magnet to increase the region of magnetic.Because the first permanent magnet 300 has stronger anti-degaussing ability, its impact by permanent magnet demagnetization is less, and the second permanent magnet 400 has more weak anti-degaussing ability, and it is positioned at, and to be subject to increasing magnetic influence when armature reaction causes permanent magnet to increase the region of magnetic also less.This design magnetic flux density waveform of each magnetic pole when empty load of motor is asymmetric, but when load near symmetrical, gap magnetic flux density waveform is approximately square wave, and can guarantee that torque ripple is little, motor operates steadily.The ability of the irreversible demagnetization that permanent magnet suppresses armature reaction to cause strengthens, and the short-time overload serviceability of motor and quick startup ability strengthen.Further, the quantity of described multiple magnetic pole is even number and is symmetrically distributed on rotor.
In sum, technical scheme of the present invention is according to the impact of armature reaction on permanent magnet pole different parts, each magnetic pole adopts the permanent magnetic material (trade mark) that two kinds of anti-degaussing abilities are different, effective customer service permanent magnet local loss of excitation problem, improve the Driving Torque of motor, reduce the torque ripple of motor, also improve the short-time overload serviceability of motor and quick startup ability.
Although the present invention with preferred embodiment disclose as above, so itself and be not used to limit the present invention.Persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is when being as the criterion depending on those as defined in claim.
Claims (7)
1. the mounted brushless DC motor rotor in the face suppressing permanent magnet to demagnetize, it is characterized in that, comprise: multiple magnetic pole, described each magnetic pole is made up of the first permanent magnet and the second permanent magnet, and described first permanent magnet and the second permanent magnet have different anti-degaussing abilities; Wherein, the anti-degaussing ability of described first permanent magnet is greater than the anti-degaussing ability of described second permanent magnet.
2. according to claim 1 mounted brushless DC motor rotor, is characterized in that, the magnetic energy product of described first permanent magnet exceeds the magnetic energy product 10% ~ 20% of the second permanent magnet.
3. according to claim 2 mounted brushless DC motor rotor, is characterized in that, the magnetic energy product of described first permanent magnet exceeds the magnetic energy product 15% of the second permanent magnet.
4. according to claim 1 mounted brushless DC motor rotor, is characterized in that, described first permanent magnet and the second permanent magnet adopt the permanent magnet of the permanent magnet of different materials or the different trade mark.
5. according to claim 1 mounted brushless DC motor rotor, is characterized in that, described first permanent magnet is positioned at the region that armature reaction causes permanent magnet to demagnetize.
6. according to claim 1 mounted brushless DC motor rotor, is characterized in that, described second permanent magnet is positioned at armature reaction and causes permanent magnet to increase the region of magnetic.
7. according to claim 1 mounted brushless DC motor rotor, is characterized in that, the quantity of described multiple magnetic pole is even number and is symmetrically distributed on rotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410557787.1A CN104283394A (en) | 2014-10-20 | 2014-10-20 | Surface-mounted-type brushless direct current motor rotor for restraining permanent magnet demagnetization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410557787.1A CN104283394A (en) | 2014-10-20 | 2014-10-20 | Surface-mounted-type brushless direct current motor rotor for restraining permanent magnet demagnetization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104283394A true CN104283394A (en) | 2015-01-14 |
Family
ID=52257980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410557787.1A Pending CN104283394A (en) | 2014-10-20 | 2014-10-20 | Surface-mounted-type brushless direct current motor rotor for restraining permanent magnet demagnetization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104283394A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106941285A (en) * | 2017-04-18 | 2017-07-11 | 上海电机学院 | Weaken the method for permanent magnetism wheel hub motor cogging torque |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2268333Y (en) * | 1996-02-02 | 1997-11-19 | 包头市永磁电机研究所 | Low-speed permanent-magnet synchronous motor |
| CN101485064A (en) * | 2006-06-12 | 2009-07-15 | 雷米技术有限公司 | Magnet for a dynamoelectric machine, dynamoelectric machine and method |
| CN101662198A (en) * | 2009-08-19 | 2010-03-03 | 东南大学 | Stator surface mounted doubly salient pole permanent magnet motor |
| WO2012098737A1 (en) * | 2011-01-19 | 2012-07-26 | 株式会社 安川電機 | Hybrid-type field permanent magnet, and rotating-electrical-machine rotor or generator using same |
| CN102761187A (en) * | 2012-05-28 | 2012-10-31 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor rotor and built-in type permanent-magnet motor |
| CN103441592A (en) * | 2013-08-12 | 2013-12-11 | 浙江大学 | Novel magnetic flux adjustable permanent magnet synchronous motor |
-
2014
- 2014-10-20 CN CN201410557787.1A patent/CN104283394A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2268333Y (en) * | 1996-02-02 | 1997-11-19 | 包头市永磁电机研究所 | Low-speed permanent-magnet synchronous motor |
| CN101485064A (en) * | 2006-06-12 | 2009-07-15 | 雷米技术有限公司 | Magnet for a dynamoelectric machine, dynamoelectric machine and method |
| CN101662198A (en) * | 2009-08-19 | 2010-03-03 | 东南大学 | Stator surface mounted doubly salient pole permanent magnet motor |
| WO2012098737A1 (en) * | 2011-01-19 | 2012-07-26 | 株式会社 安川電機 | Hybrid-type field permanent magnet, and rotating-electrical-machine rotor or generator using same |
| CN102761187A (en) * | 2012-05-28 | 2012-10-31 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor rotor and built-in type permanent-magnet motor |
| CN103441592A (en) * | 2013-08-12 | 2013-12-11 | 浙江大学 | Novel magnetic flux adjustable permanent magnet synchronous motor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106941285A (en) * | 2017-04-18 | 2017-07-11 | 上海电机学院 | Weaken the method for permanent magnetism wheel hub motor cogging torque |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104882981B (en) | A kind of rotor punching structure of permanent-magnet servo motor | |
| US20140152139A1 (en) | Permanent magnet synchronous motor | |
| MX2016012898A (en) | Brushless motor. | |
| Liu et al. | Influence of rotor pole number on electromagnetic performance of novel variable flux reluctance machine with DC-field coil in stator | |
| CN110350746A (en) | Magneto | |
| Shi et al. | Comparative study of novel biased flux permanent magnet machine with doubly salient permanent magnet machine | |
| Afinowi et al. | Performance analysis of switched-flux machines with hybrid NdFeB and ferrite magnets | |
| US9502933B2 (en) | Permanent magnet synchronous electric machine | |
| CN104283394A (en) | Surface-mounted-type brushless direct current motor rotor for restraining permanent magnet demagnetization | |
| CN101944787A (en) | Outer surface structure of magnetic steel embedded rotor | |
| JP5326326B2 (en) | Motor, electrical equipment | |
| Shi et al. | Influence of flux focusing on electromagnetic torque of novel biased flux PM machines | |
| Kim et al. | Design of novel overhang structure for separated pole-piece type ferrite magnet motor | |
| CN104079094A (en) | Rotor-core stamped sheet of three-phase frequency-conversion permanent magnet synchronous motor | |
| CN202004609U (en) | Permanent magnet synchronous motor with wide speed regulation range | |
| Atallah et al. | A rotor with axially and circumferentially magnetized permanent magnets | |
| Yang et al. | Flux-weakening capability of flux-switching permanent magnet motor | |
| Hsieh et al. | Cost-effective Design for high efficiency synchronous reluctance motor | |
| KR101302511B1 (en) | Surface-mounted permanent magnet motor and rotor including the same | |
| US10069358B2 (en) | Rotor of electric motor with permanent magnets | |
| JP5307611B2 (en) | motor | |
| US10581286B2 (en) | Permanent-magnet-embedded electric motor and compressor | |
| Jeong et al. | Design of SRM considering dual drive modes | |
| Babu et al. | A Comparative Analysis of Cogging Torque Reduction in BLDC Motor Using Bifurcation and Slot Opening Variation | |
| Hao et al. | Influence of slot opening width on the performance of surface permanent magnet motors with fractional slot concentrated windings |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150114 |