CN1291539C - Low power consumption brushless DC motor with Halbach magnet structure - Google Patents
Low power consumption brushless DC motor with Halbach magnet structure Download PDFInfo
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- CN1291539C CN1291539C CN 200510011242 CN200510011242A CN1291539C CN 1291539 C CN1291539 C CN 1291539C CN 200510011242 CN200510011242 CN 200510011242 CN 200510011242 A CN200510011242 A CN 200510011242A CN 1291539 C CN1291539 C CN 1291539C
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- rotor iron
- halbach
- halbach magnet
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Abstract
The present invention relates to a low-consumption brushless DC motor with a halbach magnetic body structure, which mainly comprises an outer rotor core, a hollow cup stator comprising a winding and a frame, a halbach magnetic body, an inner rotor core and a rotor shaft, wherein the outer rotor core and the inner rotor core are respectively connected to the rotor shaft, and the outer rotor core and the inner rotor core rotate with the rotor shaft; the halbach magnetic body is arranged on the inner rotor core or the outer rotor core, and the hollow cup stator is fixed on a casing. A permanent magnetism path forms a closed loop by the halbach magnetic body, the rotor core and air gaps between the halbach magnetic body and the rotor core. The present invention utilizes the novel halbach magnetic body structure, which can make the thickness of the rotor core largely decreased and the air gap magnetic density largely increased. Thereby, the volume and the weight are decreased, and the motor consumption is reduced.
Description
Affiliated technical field
The present invention relates to a kind of brushless, permanently excited direct current motor, particularly a kind of Halbach magnet structure low power consumption brushless DC motor is specially adapted to occasions such as low-power consumption, high speed.
Background technology
Traditional brushless DC motor body is identical with permanent magnet synchronous motor, because the existence of stator core, when motor rotation, can in stator core, produce magnetic hysteresis and eddy current loss, these losses are directly proportional with 1.3 powers of rotor speed, particularly, can in stator core, produce huge loss, thereby increase the power consumption of motor greatly when rotor during at high speed rotating; Simultaneously, because the existence of stator teeth groove produces cogging torque and slot ripples in the time of can making the rotor rotation, thereby can make torque take place to pulse and produce certain loss.No teeth groove brushless DC motor can be eliminated cogging torque and slot ripples, but because the slotless electric machines effective air gap is big, and air gap flux density is low, thereby the power density that can cause motor reduces.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, provide a kind of low in energy consumption, the loss of electric machine is low, volume is little, in light weight, and the Halbach magnet structure low power consumption brushless DC motor that increases greatly of air gap flux density.
Technical solution of the present invention is: a kind of Halbach magnet structure brushless DC motor, its characteristics are: comprise armature spindle, casing, sleeve, Halbach magnet, internal rotor iron core, drag cup stator, external rotor iron core and bearing, external rotor is unshakable in one's determination to be connected with sleeve, the internal rotor iron core is connected on the armature spindle, external rotor is unshakable in one's determination together to be rotated with armature spindle with the internal rotor iron core, the Halbach magnet is installed on internal rotor iron core or the external rotor iron core, and the drag cup stator is installed on the casing.Permanent magnetic circuit constitutes the closed-loop path through Halbach magnet, rotor core and the air gap between them.
Principle of the present invention is: permanent magnet of the present invention is the Halbach magnet structure, each piece permanent magnet magnetizes according to certain way and bonds together, electric machine rotor iron core is divided into the unshakable in one's determination and internal rotor two parts unshakable in one's determination of external rotor, both are fixed on the armature spindle and with rotating shaft and rotate, because the Halbach magnet does not have relative motion with respect to rotor core, thereby can not produce eddy current loss in rotor core and armature spindle.Place cup-shaped winding to detect the position of Halbach magnet poles Hall element, output signal according to Hall element, give in the corresponding winding and pass to direct current, will produce magnetic field in the winding like this, the magnetic field interaction that this magnetic field and Halbach magnet produce makes external rotor iron core, internal rotor iron core and rotating shaft together rotate.
The present invention's advantage compared with prior art is: the present invention has adopted a kind of novel Halbach magnet structure and drag cup winding construction, it is little that this can make that brshless DC motor has a volume, in light weight, loss is little, torque is steady, advantages such as armature reaction is little, simultaneously can be so that thickness unshakable in one's determination reduces greatly, air gap flux density increases greatly, this be because: (1) is compared with traditional brshless DC motor, because motor of the present invention does not have teeth groove, so eliminated the slot effect of traditional brshless DC motor, no teeth groove also helps the winding heat radiation, owing to a little less than this kind structural electromotor armature reaction, also help the realization of various control methods such as no transducer; (2) compare with no teeth groove brshless DC motor, the present invention has adopted the Halbach magnet structure, when placing external rotor unshakable in one's determination, because the magnet magnetic flux overwhelming majority is unshakable in one's determination closed with air gap and internal rotor, so external rotor rear of core size is reduced greatly, this helps reducing motor volume, alleviates motor weight; When placing internal rotor unshakable in one's determination, because the magnet magnetic flux overwhelming majority is unshakable in one's determination closed with air gap and external rotor, so internal rotor rear of core size is reduced greatly, this helps reducing motor volume equally, alleviates motor weight; No matter place the unshakable in one's determination or internal rotor iron core of external rotor, because the characteristics that magnetize of Halbach magnet itself can make that all air gap flux density improves greatly, this helps the raising of motor torque; (3) owing to the motor non-stator iron core, so fundamentally eliminated the stator core loss; All there is not relative motion because external rotor is unshakable in one's determination with internal rotor iron core and Halbach magnet again, so eliminated the eddy current loss in rotor core and the armature spindle.
Description of drawings
Brushless DC motor structure schematic diagram when Fig. 1 places external rotor unshakable in one's determination for Halbach magnet of the present invention;
Brushless DC motor structure schematic diagram when Fig. 2 places internal rotor unshakable in one's determination for Halbach magnet of the present invention;
Fig. 3 is a Halbach magnet structure schematic diagram, and wherein Fig. 3 a is the mode that magnetizes when the Halbach magnet places internal rotor unshakable in one's determination, and Fig. 3 b is the mode that magnetizes that adopts when the Halbach magnet structure places external rotor unshakable in one's determination;
Fig. 4 is a drag cup stator structure schematic diagram of the present invention.
Embodiment
As depicted in figs. 1 and 2, the structure low power consumption brushless direct current machine of Halbach magnet structure of the present invention is by armature spindle 1, casing 2, sleeve 3, Halbach magnet 4, internal rotor iron core 5, drag cup stator 6, external rotor unshakable in one's determination 7 and bearing 8 are formed, external rotor unshakable in one's determination 7 is connected with sleeve 3, internal rotor iron core 5 is connected on the armature spindle 1, external rotor unshakable in one's determination 7 and internal rotor iron core 5 together rotate with armature spindle 1, Halbach magnet 4 can be installed on the internal rotor iron core 5, as shown in Figure 1, also can be installed on the external rotor iron core 7, as shown in Figure 2, consider that rotor can produce huge centrifugal force when high speed rotating, generally place Halbach magnet 4 on the external rotor iron core 7.
When armature spindle 1 and sleeve 3 employing permeability magnetic materials, external rotor unshakable in one's determination 7 needs be connected on the sleeve 3 by non-magnet material, and internal rotor iron core 5 also need pass through non-magnet material (as copper, aluminium, titanium alloy etc.) and be connected with armature spindle 1, to reduce leakage field.When armature spindle 1 and sleeve 3 adopted non-magnet materials such as stainless steel, aluminium, titanium alloy etc., external rotor iron core 7 can directly link to each other with sleeve 3, and internal rotor iron core 5 can directly be fixed on the armature spindle 1.
Bearing 8 among Fig. 1 and Fig. 2 can be used mechanical bearing, also can use magnetic suspension bearing, for occasions such as low-power consumption, high speeds, should use magnetic suspension bearing.
As shown in Figure 3, when Halbach magnet structure of the present invention places internal rotor unshakable in one's determination, should adopt the mode that magnetizes of Fig. 3 a, if the number of pole-pairs of motor is p, the piece number that every utmost point is divided into the Halbach magnet is n, then i piece magnet (the angle θ of magnetizing direction of i=1～2pn)
iAccording to formula
Carry out, then each magnet is bonded together.When the Halbach magnet structure places external rotor unshakable in one's determination, should adopt the mode that magnetizes of Fig. 3 b, if the number of pole-pairs of motor is p, the piece number that every utmost point is divided into the Halbach magnet is n, then i piece magnet (the angle θ of magnetizing direction of i=1～2pn)
iAccording to formula
Carry out, then each magnet is bonded together.Shown in Figure 3 is 4 utmost point motors, the situation when each magnetic pole is divided into 3 Halbach magnets.Halbach magnet 4 can adopt in shirt cobalt permanent magnet material or ferrite permanent magnet material or the Nd-Fe-Bo permanent magnet material any one to get final product.
As shown in Figure 4, hollow cup-shaped sub 6 comprise by cup-shaped skeleton 61 and winding 62 and forming, have groove on the skeleton 61, winding 62 coiled chain types are wrapped on the skeleton 61, and with epoxy resin 63 embeddings, Hall element 64 places cup-shaped winding, be used to detect the position of Halbach magnet 4 magnetic poles, output signal according to Hall element 64, give in the winding 62 and pass to direct current, will produce magnetic field in the winding 62 like this, the magnetic field interaction that this magnetic field and Halbach magnet 4 produce makes external rotor iron core 7, internal rotor iron core 5, sleeve 3 and armature spindle 1 together rotate.
Claims (7)
1, a kind of Halbach magnet structure brushless DC motor, it is characterized in that: it comprises armature spindle (1), casing (2), sleeve (3), Halbach magnet (4), internal rotor iron core (5), drag cup stator (6), external rotor iron core (7) and bearing (8), external rotor iron core (7) is connected with sleeve (3), internal rotor iron core (5) is connected on the armature spindle (1), external rotor iron core (7) together rotates with the same armature spindle of internal rotor iron core (5) (1), Halbach magnet (4) is installed on internal rotor iron core (5) or the external rotor iron core (7), and drag cup stator (6) is installed on the casing (2).
2, Halbach magnet structure brushless DC motor according to claim 1, it is characterized in that: when described armature spindle (1) and sleeve (3) employing permeability magnetic material, external rotor iron core (7) needs to be connected on the sleeve (3) by non-magnet material, internal rotor iron core (5) also needs to be connected with armature spindle (1) by non-magnet material, to reduce leakage field.
3, Halbach magnet structure brushless DC motor according to claim 1, it is characterized in that: when described armature spindle (1) and sleeve (3) employing non-magnet material, external rotor iron core (7) and internal rotor iron core (5) can directly be fixed on respectively on sleeve (3) and the armature spindle (1).
4, Halbach magnet structure brushless DC motor according to claim 1, it is characterized in that: when described Halbach magnet (4) places internal rotor unshakable in one's determination, if the number of pole-pairs of brushless DC motor is p, the piece number that every utmost point is divided into the Halbach magnet is n, then the angle θ of i piece magnet magnetizing direction
iAccording to formula
Carry out, wherein i=1～2pn bonds together each magnet then.
5, Halbach magnet structure brushless DC motor according to claim 1, it is characterized in that: when described Halbach magnet (4) structure places external rotor unshakable in one's determination, if the number of pole-pairs of brushless DC motor is p, the piece number that every utmost point is divided into the Halbach magnet is n, then the angle θ of i piece magnet magnetizing direction
iAccording to formula
Carry out, wherein i=1～2pn bonds together each magnet then.
6, Halbach magnet structure brushless DC motor according to claim 1 is characterized in that: described drag cup stator (6) is made up of cup-shaped skeleton (61) and winding (62).
7, Halbach magnet structure brushless DC motor according to claim 1 is characterized in that: the material of described Halbach magnet (4) is shirt cobalt permanent magnet material or ferrite permanent magnet material or Nd-Fe-Bo permanent magnet material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510011242 CN1291539C (en) | 2005-01-24 | 2005-01-24 | Low power consumption brushless DC motor with Halbach magnet structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510011242 CN1291539C (en) | 2005-01-24 | 2005-01-24 | Low power consumption brushless DC motor with Halbach magnet structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1652438A CN1652438A (en) | 2005-08-10 |
| CN1291539C true CN1291539C (en) | 2006-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200510011242 Expired - Fee Related CN1291539C (en) | 2005-01-24 | 2005-01-24 | Low power consumption brushless DC motor with Halbach magnet structure |
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Families Citing this family (18)
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| CN101783557B (en) * | 2010-02-08 | 2012-03-21 | 北京航空航天大学 | Permanent magnet synchronous motor without stator iron core |
| CN102064658A (en) * | 2010-12-01 | 2011-05-18 | 北京奇峰聚能科技有限公司 | Brushless DC motor with high sinusoidal air gap magnetic density and low power consumption |
| CN102497075A (en) * | 2011-12-26 | 2012-06-13 | 北京理工大学 | Switched reluctance motor with dual-rotor structure |
| CN103457424A (en) * | 2013-05-17 | 2013-12-18 | 湖南大学 | Double-rotor iron-core-free permanent-magnet synchronous motor |
| CN103795203B (en) * | 2014-01-22 | 2016-04-20 | 北京航空航天大学 | A kind of novel two-part seven phase fault tolerant permanent magnet motor |
| CN105450087A (en) * | 2014-08-26 | 2016-03-30 | 付真强 | Permanent magnet set rotator and suspension permanent-magnet motor |
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| CN107306074A (en) * | 2016-04-25 | 2017-10-31 | 深圳市科卫泰实业发展有限公司 | A kind of drag cup brushless electric machine |
| CN106849430B (en) * | 2017-03-15 | 2019-03-01 | 中能投资国际控股有限公司 | The manufacturing method of rotor for electromotor, motor, generator and rotor for electromotor |
| CN107620714A (en) * | 2017-09-29 | 2018-01-23 | 广东威灵电机制造有限公司 | Electronic water pump |
| RU2695813C1 (en) * | 2018-10-09 | 2019-07-29 | Алексей Александрович Никифоров | Electric motor |
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| CN109980887A (en) * | 2019-03-11 | 2019-07-05 | 浙江省东阳市东磁诚基电子有限公司 | The more pole wheel structures of micro hollow cup vibrating motor |
| CN109780985A (en) * | 2019-03-14 | 2019-05-21 | 苏州赛得尔智能科技有限公司 | A kind of magnetic suspension bearing micro-displacement detection device |
| CN110311524A (en) * | 2019-06-18 | 2019-10-08 | 深圳市优必选科技股份有限公司 | Hollow cup brushless direct current motor and robot |
| CN110233556A (en) * | 2019-07-12 | 2019-09-13 | 深圳市鑫宝达电机有限公司 | A kind of bimorph transducer magnetic field permanent magnet DC hollow cup motor |
| CN110994894A (en) * | 2019-12-24 | 2020-04-10 | 武汉万至达智能科技有限公司 | Super-high-speed rotor assembly directly driven by iron loss-free permanent magnet brushless motor |
| CN113131705B (en) * | 2021-04-27 | 2023-04-07 | 山东大学 | Cup-shaped winding permanent magnet synchronous motor, energy storage flywheel and method |
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- 2005-01-24 CN CN 200510011242 patent/CN1291539C/en not_active Expired - Fee Related
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| CN1652438A (en) | 2005-08-10 |
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Granted publication date: 20061220 Termination date: 20190124 |