CN104734383A - Novel rotor of brushless direct current motor - Google Patents
Novel rotor of brushless direct current motor Download PDFInfo
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- CN104734383A CN104734383A CN201510153096.XA CN201510153096A CN104734383A CN 104734383 A CN104734383 A CN 104734383A CN 201510153096 A CN201510153096 A CN 201510153096A CN 104734383 A CN104734383 A CN 104734383A
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Abstract
The invention discloses a novel rotor of a brushless direct current motor. The peripheral face of the rotor is composed of an even number of eccentric arcs, the contour of the rotor is in a quincunx shape, a permanent magnet groove corresponds to each eccentric arc, a magnetism isolating bridge is arranged between every two adjacent permanent magnet grooves, and magnetic blocks are imbedded in each permanent magnet groove in sequence from N to S; the two ends of each magnetism isolating bridge are parallel, the width a of each magnetism isolating bridge is 0.3-3 mm, and the eccentric distance of each eccentric arc is 0.5-3mm; the two ends, close to an end face of the corresponding eccentric arc, of each magnetism isolating bridge are provided with oblique planes which are approximately parallel to the two ends of the corresponding eccentric arc, and the included angle c between the oblique planes on every two adjacent permanent magnet grooves ranges from 75 degrees to 160 degrees. The eccentric arcs and the permanent magnet grooves of the novel rotor are designed to be mutually matched, the air-gap magnetic field and the winding counter electromotive force wave form are improved, the magnetic field cutting inside the motor is effectively improved, and the rotation inertia moment of the rotor is decreased, so that the commutation noise and commutation vibration generated when the motor rotates are reduced, and an obvious effect for meeting the operating requirements of silence and slight vibration is achieved for the motor.
Description
Technical field
The present invention relates to the technical field of DC brushless motor, particularly a kind of novel rotor of DC brushless motor.
Background technology
Existing motor is varied, and substantially can be divided into alternating current machine and the large class of direct current machine two, direct current machine is divided into again brush and brushless two kinds, and it is simple that alternating current machine has structure, the advantages such as cost is low, noise is little, but speed governing is difficult.Although there is brushless motor speed governing easy, have noise large, complex structure, easily breaks down, the shortcomings such as maintenance difficult.DC brushless motor is a kind of representative Novel electromechanical integration product, the technology related to comprises material technology, electronic technology, information technology and detection technique etc., brushless electric machine develops from electrical micro-machine, DC brushless motor is with the service behaviour of its excellence, obtain in industries such as automobile, household electrical appliance, Aero-Space, automations and apply very widely, along with the development of permanent magnetic material, electronic technology, automatic control technology and power electronic technology, DC brushless motor have also been obtained significant progress and development.
The brushless DC motor cylindrical of current routine is mainly for wholecircle, and permanent magnet is installed and mainly contained the form such as permanent magnet Surface Mount, permanent magnet interior edge, injecting magnetic rotor, all can produce vibration in various degree and noise when electric motor starting or running.Trace it to its cause, the magnetic force being mainly rotor is more powerful, makes the startup moment of inertia of rotor larger, needs once to add electric current and moment during startup, thus motor oscillating and noise are increased.And when running, due to rotor surface magnetic force N, S pole relatively, N, S disturb obviously extremely mutually, cause rotor rotate time stator phase commutation vibrating noise obvious.
Therefore, need the novel rotor inventing a kind of DC brushless motor to overcome the problems referred to above.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of novel rotor that effectively can improve DC brushless motor moment of inertia, vibration and noise.
Technical scheme of the present invention can be realized by following technical measures: a kind of novel rotor of DC brushless motor, the outer peripheral face of described rotor is made up of even number eccentric arc, the profile of rotor is quincunx, each eccentric arc is to there being permanent magnet groove, be provided with every magnetic bridge between adjacent permanent magnetism metal trough, in described permanent magnetism metal trough, embed magnetic patch successively by N ~ S respectively; Described parallel every magnetic bridge two ends, its width a is 0.3 ~ 3mm, and the eccentric distance of described eccentric arc is 0.5 ~ 3 mm; The two ends of the end face near eccentric arc on described permanent magnetism metal trough are provided with described eccentric arc both ends close to parallel inclined-plane, and the angle c between the inclined-plane on adjacent permanent magnetism metal trough is 75 ° ~ 160 °.
As the preferred implementation of the novel rotor of DC brushless motor of the present invention, described permanent magnetism metal trough is strip.
As the preferred implementation of the novel rotor of DC brushless motor of the present invention, the inclined-plane on described permanent magnetism metal trough and the distance b between eccentric arc end are 0.3 ~ 3mm.
Compared with prior art, technical scheme of the present invention has following beneficial effect: the novel rotor cylindrical of DC brushless motor of the present invention forms quincuncial shape by several eccentric arc, eccentric size Control is at 0.5 ~ 3MM, eccentric circular arc is longer than the circular arc of wholecircle, and the magnetic force distribution area of each magnetic pole can be made to lengthen, the distribution of magnetic force is more reasonable, be conducive to the cutting in magnetic field, thus reduce the moment of inertia of motor, more smooth and easy when making motor commutation, effectively reduce noise and vibration that motor commutation produces.The magnetic field that the present invention can improve motor internal is effectively cut, and subtracts trochantinian rotator inertia moment, thus the noise of commutation when improving electric machine rotation and vibration, and what have quiet and that vibration is a little instructions for use to motor has obvious effect.The novel rotor of DC brushless motor of the present invention ensure that stability, the reliability of the novel rotor of DC brushless motor from structural design, the eccentric arc of novel rotor of the present invention and permanent magnet trough are the designs that cooperatively interacts, the eccentric arc of novel rotor of the present invention and the quantity of permanent magnet trough change according to the number of poles change of motor, if number of poles is 2,4,6,8,10 ..., its quantity is 2,4,6,8,10 ...The eccentric arc of novel rotor of the present invention significantly can improve air-gap field and winding back emf waveform, this rotor structure each permanent magnetism metal trough both sides are respectively equipped with every magnetic bridge simultaneously, leakage flux should can be reduced every arranging of magnetic bridge, inherently improve the air gap magnetic density waveform of DC brushless motor, thus improve DC brushless motor back emf waveform, reduce eddy current loss, reduce torque pulsation, reduce vibration and the noise of motor, reduce the temperature rise of motor, improve the efficiency of motor, improve the stability that motor runs, improve the allomeric function of motor.
Accompanying drawing explanation
The invention will be further described to utilize accompanying drawing, but the embodiment in accompanying drawing does not form any limitation of the invention.
Fig. 1 is the structural representation of the preferred embodiment of the novel rotor of DC brushless motor of the present invention.
Fig. 2 is the structure for amplifying schematic diagram at A place in Fig. 1.
Fig. 3 is by the structural representation of the novel rotor of the DC brushless motor of the direct injection moulding of injecting magnetic.
Embodiment
For making the present invention easier to understand, specific embodiments of the invention will be set forth further below.Describe the specific embodiment of the present invention in detail below in conjunction with accompanying drawing, it illustrates principle of the present invention as the part of this specification by embodiment, and other aspects of the present invention, feature and advantage thereof will become very clear by this detailed description.In the accompanying drawing of institute's reference, in different figure, same or analogous parts use identical drawing reference numeral to represent.
As depicted in figs. 1 and 2, for the novel rotor of DC brushless motor of the present invention, the novel rotor of the design is interior edge type rotor, be made up of eccentric arc 11 and permanent magnet trough 12, preferably, described permanent magnetism metal trough 12 is in strip, the main feature of the novel rotor 10 of DC brushless motor of the present invention is the unconventional wholecircle rotor of cylindrical of rotor 10, but the quincuncial rotor that the cylindrical of rotor 10 and corresponding eccentric arc 11 combine, each permanent magnet trough 12 of its rotor 10 and eccentric arc 11 one_to_one corresponding, can according to the different eccentric arcs of different rotor numbers of poles design varying number, and the eccentric distance controlling eccentric arc 11 is 0.5 ~ 3 mm.The magnetic field that the present invention can improve motor internal is effectively cut, and reduces the rotator inertia moment of rotor 10, thus the noise of commutation when improving electric machine rotation and vibration, and what have quiet and that vibration is a little instructions for use to motor has obvious effect.
The outer peripheral face of the novel rotor 10 of a kind of DC brushless motor of the present invention is made up of even number eccentric arc 10, the profile of rotor 10 is quincunx, eccentric circular arc 11 is longer than the circular arc of wholecircle, and the magnetic force distribution area of each magnetic pole can be made to lengthen, the distribution of magnetic force is more reasonable, is conducive to the cutting in magnetic field, thus reduces the moment of inertia of motor, more smooth and easy when making motor commutation, effectively reduce noise and vibration that motor commutation produces.The dextrorotation sex distortion rate that can reduce DC brushless motor voltage waveform in quincuncial rotor 10 of the present invention, reduces electromagnetic noise, reduces vibration when motor runs.Wherein, each eccentric arc 11 is to there being permanent magnet groove 12, be provided with between adjacent permanent magnetism metal trough 12 every magnetic bridge 13, every the magnetic path width that the Main Function of magnetic bridge 13 is for reducing the radial leakage field of magnet steel, improve magnet steel utilance, reduce the overall consumption of magnet steel, to save material, and can leakage flux be reduced, inherently improve the air gap magnetic density waveform of DC brushless motor, thus improve DC brushless motor back emf waveform, reduce eddy current loss, reduce torque pulsation, reduce vibration and the noise of motor, reduce the temperature rise of motor, improve the efficiency of motor, improve the stability that motor runs.
Magnetic patch (not indicating in figure) is embedded successively by N ~ S respectively in described permanent magnetism metal trough 12, novel rotor 10 of the present invention is designed to edge in permanent magnet, the design of permanent magnet trough 12 is mainly the control every magnetic bridge 13 between permanent magnet N, S pole, two ends keeping parallelism is required every magnetic bridge 13, its width a controls between 0.3 ~ 3MM, and the limit angle angle c of permanent magnet trough 12 is designed according to eccentric arc 11, make it with eccentric arc 11 close to parallel, angle c controls between 75 ° ~ 160 °, and width b controls between 0.3 ~ 3MM.The design of permanent magnet trough 12 makes the magnetic force of N, S pole between two adjacent permanent magnets influence each other reduction, the magnetic force of every part of magnetic pole is more independent of on each eccentric arc 11, thus be conducive to magnetic field cutting and to control during motor commutation, more smooth and easy when making motor rotation commutation.Described parallel every magnetic bridge 13 two ends, its width a is 0.3 ~ 3mm, the two ends of the end face near eccentric arc 11 on described permanent magnetism metal trough 12 are provided with described eccentric arc 11 both ends close to parallel inclined-plane 121, angle c between inclined-plane 121 on adjacent permanent magnetism metal trough 12 is 75 ° ~ 160 °, and the inclined-plane 121 on described permanent magnetism metal trough 12 and the distance b between eccentric arc 11 end are 0.3 ~ 3mm.
It is shaping that the novel rotor of DC brushless motor of the present invention also can have eccentric arc 11 by the direct injection moulding of injecting magnetic, as shown in Figure 3, above injecting magnetic rotor, when rotor surface magnetizes, magnetic field can be made more independent of on each eccentric arc 11 of rotor surface, thus reach the cutting that is conducive to magnetic field and to control during motor commutation, effect more smoothly when making motor rotation commutation.
The novel rotor cylindrical of DC brushless motor of the present invention forms quincuncial shape by several eccentric arc 11, eccentric size Control is at 0.5 ~ 3MM, eccentric circular arc 11 is longer than the circular arc of wholecircle, and the magnetic force distribution area of each magnetic pole can be made to lengthen, the distribution of magnetic force is more reasonable, is conducive to the cutting in magnetic field, thus reduces the moment of inertia of motor, more smooth and easy when making motor commutation, effectively reduce noise and vibration that motor commutation produces.The magnetic field that the present invention can improve motor internal is effectively cut, and reduces the rotator inertia moment of rotor 10, thus the noise of commutation when improving electric machine rotation and vibration, and what have quiet and that vibration is a little instructions for use to motor has obvious effect.The novel rotor 10 of DC brushless motor of the present invention ensure that stability, the reliability of the novel rotor of DC brushless motor from structural design, the eccentric arc 11 of novel rotor 10 of the present invention and permanent magnet trough 12 are the designs that cooperatively interact, the eccentric arc 11 of novel rotor of the present invention and the quantity of permanent magnet trough 12 change according to the number of poles change of motor, if number of poles is 2,4,6,8,10 ..., its quantity is 2,4,6,8,10 ...The eccentric arc 11 of novel rotor of the present invention significantly can improve air-gap field and winding back emf waveform, this rotor structure each permanent magnetism metal trough 12 both sides are respectively equipped with every magnetic bridge 13 simultaneously, leakage flux should can be reduced every arranging of magnetic bridge 13, inherently improve the air gap magnetic density waveform of DC brushless motor, thus improve DC brushless motor back emf waveform, reduce eddy current loss, reduce torque pulsation, reduce vibration and the noise of motor, reduce the temperature rise of motor, improve the efficiency of motor, improve the stability that motor runs, improve the allomeric function of motor.
Finally to should be noted that; above embodiment is only in order to illustrate technical scheme of the present invention but not limiting the scope of the invention; although be explained in detail the present invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to technical scheme of the present invention or equivalent replacement, and not depart from essence and the scope of technical solution of the present invention.
Claims (3)
1. the novel rotor of a DC brushless motor, it is characterized in that, the outer peripheral face of described rotor is made up of even number eccentric arc, the profile of rotor is quincunx, each eccentric arc is to there being permanent magnet groove, be provided with every magnetic bridge between adjacent permanent magnetism metal trough, in described permanent magnetism metal trough, embed magnetic patch successively by N ~ S respectively; Described parallel every magnetic bridge two ends, its width (a) is 0.3 ~ 3mm, and the eccentric distance of described eccentric arc is 0.5 ~ 3 mm; The two ends of the end face near eccentric arc on described permanent magnetism metal trough are provided with described eccentric arc both ends close to parallel inclined-plane, and the angle (c) between the inclined-plane on adjacent permanent magnetism metal trough is 75 ~ 160 °.
2. the novel rotor of DC brushless motor according to claim 1, is characterized in that, described permanent magnetism metal trough is strip.
3. the novel rotor of DC brushless motor according to claim 1, is characterized in that, the inclined-plane on described permanent magnetism metal trough and the distance (b) between eccentric arc end are 0.3 ~ 3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510153096.XA CN104734383A (en) | 2015-04-02 | 2015-04-02 | Novel rotor of brushless direct current motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510153096.XA CN104734383A (en) | 2015-04-02 | 2015-04-02 | Novel rotor of brushless direct current motor |
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| CN104734383A true CN104734383A (en) | 2015-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510153096.XA Pending CN104734383A (en) | 2015-04-02 | 2015-04-02 | Novel rotor of brushless direct current motor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743314A (en) * | 2016-05-06 | 2016-07-06 | 吕三元 | Brushless energy-saving automobile motor of highly efficient new energy rare earth permanent magnet direct-current |
| CN107124055A (en) * | 2017-06-30 | 2017-09-01 | 广东美芝制冷设备有限公司 | Rotor, magneto, the compressor of compressor |
| CN113381543A (en) * | 2021-07-14 | 2021-09-10 | 横店集团东磁股份有限公司 | Permanent magnet motor rotor, permanent magnet motor and processing method of permanent magnet motor rotor |
| CN115811157A (en) * | 2021-09-10 | 2023-03-17 | 广东汉宇汽车配件有限公司 | Rotor and electric water pump using same |
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 |
| KR101307058B1 (en) * | 2012-03-06 | 2013-09-11 | 한양대학교 에리카산학협력단 | Permanent magnet dc motor |
| CN104065226A (en) * | 2014-06-19 | 2014-09-24 | 浙江中源电气有限公司 | Permanent magnet vector motor |
-
2015
- 2015-04-02 CN CN201510153096.XA patent/CN104734383A/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 |
| KR101307058B1 (en) * | 2012-03-06 | 2013-09-11 | 한양대학교 에리카산학협력단 | Permanent magnet dc motor |
| CN104065226A (en) * | 2014-06-19 | 2014-09-24 | 浙江中源电气有限公司 | Permanent magnet vector motor |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743314A (en) * | 2016-05-06 | 2016-07-06 | 吕三元 | Brushless energy-saving automobile motor of highly efficient new energy rare earth permanent magnet direct-current |
| CN107124055A (en) * | 2017-06-30 | 2017-09-01 | 广东美芝制冷设备有限公司 | Rotor, magneto, the compressor of compressor |
| CN113381543A (en) * | 2021-07-14 | 2021-09-10 | 横店集团东磁股份有限公司 | Permanent magnet motor rotor, permanent magnet motor and processing method of permanent magnet motor rotor |
| CN115811157A (en) * | 2021-09-10 | 2023-03-17 | 广东汉宇汽车配件有限公司 | Rotor and electric water pump using same |
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Application publication date: 20150624 |