CN102904404A - Halbach-structure-based iron-core-free axial magnetic field brushless direct-current electromotor - Google Patents

Halbach-structure-based iron-core-free axial magnetic field brushless direct-current electromotor Download PDF

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Publication number
CN102904404A
CN102904404A CN2012102868293A CN201210286829A CN102904404A CN 102904404 A CN102904404 A CN 102904404A CN 2012102868293 A CN2012102868293 A CN 2012102868293A CN 201210286829 A CN201210286829 A CN 201210286829A CN 102904404 A CN102904404 A CN 102904404A
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China
Prior art keywords
permanent magnet
rotor
halbach
core
magnetic field
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CN2012102868293A
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Chinese (zh)
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黄允凯
曹永娟
金龙
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Southeast University
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Southeast University
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Priority to CN2012102868293A priority Critical patent/CN102904404A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/64Electric machine technologies in electromobility

Abstract

The invention discloses a Halbach-structure-based iron-core-free axial magnetic field brushless direct-current electromotor which comprises a stator iron-core-free armature disc, a permanent magnet, a rotor disc, a shaft, a bearing and a rotor outer shell, wherein two symmetrical rotor discs are arranged at two sides of the stator iron-core-free armature disc; the stator iron-core-free armature disc and the rotor disc are installed on the shaft; the shaft is installed in the rotor outer shell through the bearing; the permanent magnet is pasted on the rotor disc, and is pasted on the inner surface of the rotor outer shell; a Halbach magnet structure with axial magnetizing and tangential magnetizing is adopted for the permanent magnet, and an enclosed magnetic circuit is formed automatically; and a soft magnetic material is placed at the middle of the permanent magnet with tangential magnetizing. According to the invention, on the basis that more permanent magnets are not used, flux density with great air clearance can be obtained, and are is in sine distribution; the output torque is high; the torque density is large; the efficiency is high; the structure is simple; the assembly is simple; and the Halbach-structure-based iron-core-free axial magnetic field brushless direct-current electromotor is suitable for relevant driving occasions with compact structures for electric automobile hub motors and the like.

Description

A kind of non iron-core axial magnetic field brushless DC motor based on the Halbach structure
Technical field
The present invention relates to the motor technology field, be specifically related to a kind of non iron-core axial magnetic field brushless DC motor based on the Halbach structure.
Background technology
Environmental pollution and energy shortage are the major issues of the world today, concerning the improvement of environment for human survival.Be accompanied by the rapidly development of automotive society, the environmental problems such as CO2 emission in the environmental problem such as the atmosphere polluting problem in the city scope and the CO2 emission in the global range and the global range have caused people's extensive concern.In order to address the above problem, the automobile of research and development energy-saving and environmental protection and safety is the only way of realizing sustainable development.Wherein, electric automobile enjoys attention with its low Hazardous, high fuel economy, high efficiency and for the advantage of the aspects such as flexibility of travelling.In the electric automobile field, adopt wheel hub motor Direct Driving System structural shape day by day to become developing direction, wheel hub motor progressively becomes the study hotspot in electric automobile field.Different from the electric vehicle structure of traditional single motor centralized driving, directly drive and exactly motor is directly installed in the wheel, a motor in taking turns, each is housed, be called wheel hub motor, the direct drive of wheel driving automobile travels.The major advantage of this structure is to have cancelled gear box and mechanical differential device, has reduced the assembly of drive chain, thereby has reduced the weight of whole drive chain, improves reliability and the efficient of whole system.Yet owing to having cancelled gear, the torque of live axle all will be produced by motor, and the volume and weight of motor can increase.Therefore the straight main challenge of drive system is to make little that the volume and weight that is installed in the wheel hub motor in the wheel tries one's best, and should carry out balance between volume, weight and the power of motor.
In view of characteristics and the requirement of wheel hub motor itself, axial magnetic field coreless permanent magnet synchronous motor is one and well selects.Axial magnetic field coreless permanent magnet synchronous motor is also arranged in the prior art, and it can reduce motor quality, eliminates cogging torque and core loss, but its stator adopts after the non iron-core, because it is large that effective air gap becomes, air gap flux density is not high, thereby the torque density that causes motor is lower.
In order to improve air gap flux density, adopt the magneto of Halbach type array permanent magnet to be employed gradually.Existing axial magnetic field coreless permanent magnet motor based on the Halbach structure, in order to obtain the air gap flux density of Sine distribution, Halbach array permanent magnet magnetizing direction must be various, certainly will improve like this manufacturing cost of permanent magnet, thereby increase the cost of whole motor, reduced cost performance.
Summary of the invention
The present invention is in order to overcome the deficiencies in the prior art, provide that a kind of permanent magnet consumption is few, cost is low, lightweight, high without iron loss, efficient, and air gap flux density increases greatly, the axial magnetic field coreless permanent magnet brushless DC motor of the Halbach magnet structure of waveform Sine distribution.
The technical solution used in the present invention is: a kind of non iron-core axial magnetic field brushless DC motor based on the Halbach structure comprises stator coreless armature dish, permanent magnet, rotor disk, axle, bearing and rotor case;
The both sides of described stator coreless armature dish are provided with two symmetric rotor dishes, stator coreless armature dish and rotor disk are installed on the axle, axle is installed in the rotor case by bearing, is pasted with permanent magnet on the described rotor disk, and permanent magnet sticks on the inner surface of rotor case;
Described permanent magnet adopts the Halbach magnet structure of axial charging and cutting orientation magnetizing, can form voluntarily closed magnetic circuit, saved rotor back iron, alleviate rotor weight, place soft magnetic material in the middle of the permanent magnet of described cutting orientation magnetizing, at the air gap flux density that guarantees to produce Sine distribution, do not weaken under the prerequisite of air gap flux density, can reduce the permanent magnet consumption, reduce the motor manufacturing cost, each magnetic pole is made of four parts on each rotor disk: the permanent magnet of axial charging, the permanent magnet of soft magnetic material and two cutting orientation magnetizings.
As preferably, described stator coreless armature dish adopts non-overlapped concentrated winding type, and the winding termination portion is shorter, and consumption is few, and copper loss is few, and this kind winding type simple structure, and is easy to process.
As preferably, described rotor case is made of the nonmagnetic substance of high mechanical properties.
As preferably, described permanent magnet is selected the NdFeB material of high energy product.
Stator of the present invention adopts the non iron-core structure, can eliminate cogging torque and core loss, eliminates the axial magnetic between the rotor, and is easy to assembly.By selecting suitable rotor permanent magnet material, soft magnetic material size and suitable riding position, can produce the field waveform of Sine distribution, the reduced harmonic component.
The axial magnetic field non iron-core brushless DC motor of a kind of Halbach magnet structure that the present invention proposes, this motor is the improvement to existing Halbach structure magneto, the Halbach permanent magnet array only adopts the magnet of axial charging and cutting orientation magnetizing both direction, in the middle of the magnet of two cutting orientation magnetizings, add soft magnetic material, guaranteeing to reduce the permanent magnet consumption on the certain basis of air gap flux density size, reduce the motor cost, alleviate rotor weight, thereby improve the torque density of motor.By selecting suitable permanent magnetic material, soft magnetic material size and their riding position, also can improve the sine of air gap flux density, the reduced harmonic component.
Beneficial effect of the present invention: 1) stator disc adopts the non iron-core structure, has eliminated cogging torque and core loss, has improved electric efficiency, has alleviated motor quality; 2) the magnet steel dish adopts axially and the Halbach permanent magnet array that tangentially combines, and has saved rotor back iron, has alleviated rotor quality, has also improved air gap flux density, thereby has improved motor output torque, the torque density increase; 3) in the middle of the permanent magnet of adjacent two cutting orientation magnetizings, embed soft magnetic material, reduced the Nd-Fe-B permanent magnet consumption of high price, reduced motor cost; 4) by reasonable arrangement permanent magnetic material and soft magnetic material size with and the position, on the basis that does not increase the permanent magnetic material consumption, can obtain at an easy rate the air gap flux density of Sine distribution, reduced harmonic reduces torque ripple.
Description of drawings
Fig. 1 is the structural representation of motor embodiment of the present invention;
Fig. 2 is the cutaway view of Fig. 1;
Fig. 3 is the expanded view of mean radius of the present invention place internal structure of motor.
Embodiment
The present invention will be further described below in conjunction with the drawings and specific embodiments.
As illustrated in fig. 1 and 2, a kind of non iron-core axial magnetic field brushless DC motor based on the Halbach structure comprises stator coreless armature dish 1, permanent magnet 2, rotor disk 3, axle 5, bearing 4 and rotor case 6; The both sides of described stator coreless armature dish 1 are provided with two symmetric rotor dishes 3, stator coreless armature dish 1 and rotor disk 3 are installed on the axle 5, axle 5 is installed in the rotor case 6 by bearing 4, is pasted with permanent magnet 2 on the described rotor disk 3, and permanent magnet 2 sticks on the inner surface of rotor case 6; Described permanent magnet 2 adopts the Halbach magnet structure of axial charging 7 and cutting orientation magnetizing 8, forms voluntarily closed magnetic circuit, places soft magnetic materials 9 in the middle of the permanent magnet 2 of cutting orientation magnetizing 8.As shown in Figure 3, each magnetic pole is made of four parts on each rotor disk 3: the permanent magnet of an axial charging 7, permanent magnet and a soft magnetic material 9 of two 90 degree cutting orientation magnetizings 8.On same rotor disk, permanent magnet 7N, the S of axial charging are separated by, magnetic flux vertically, by axial charging N utmost point permanent magnet-cutting orientation magnetizing permanent magnet, soft magnetic material-axial charging S utmost point permanent magnet-air gap-axial charging S utmost point permanent magnet-cutting orientation magnetizing permanent magnet, soft magnetic material-axial charging N utmost point permanent magnet on the axial charging N utmost point permanent magnet 7-air gap on the magnet steel dish-stator coreless armature dish 1-another magnet steel dish, so form a closed-loop path, need not rotor back iron and consist of closed magnetic circuit.
Described stator coreless armature dish 1 adopts non-overlapped concentrated winding type, directly directly injection molded by non-overlapped concentrated winding, this winding type has advantages of that termination portion is short, easy to process, A, B, the symmetrical placement of C three phase windings on the stator, be provided with lead-out wire, in order to apply three-phase alternating current.Described rotor case 6 is made of the nonmagnetic substance of high mechanical properties, and described permanent magnet 2 is selected the NdFeB material of high energy product.
Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.In the present embodiment not clear and definite each part all available prior art realized.

Claims (4)

1. the non iron-core axial magnetic field brushless DC motor based on the Halbach structure is characterized in that: comprise stator coreless armature dish, permanent magnet, rotor disk, axle, bearing and rotor case;
The both sides of described stator coreless armature dish are provided with two symmetric rotor dishes, stator coreless armature dish and rotor disk are installed on the axle, axle is installed in the rotor case by bearing, is pasted with permanent magnet on the described rotor disk, and permanent magnet sticks on the inner surface of rotor case;
Described permanent magnet adopts the Halbach magnet structure of axial charging and cutting orientation magnetizing, form voluntarily closed magnetic circuit, place soft magnetic material in the middle of the permanent magnet of described cutting orientation magnetizing, each magnetic pole is made of four parts on each rotor disk: the permanent magnet of axial charging, the permanent magnet of soft magnetic material and two cutting orientation magnetizings.
2. a kind of non iron-core axial magnetic field brushless DC motor based on the Halbach structure according to claim 1, it is characterized in that: described stator coreless armature dish adopts non-overlapped concentrated winding type.
3. a kind of non iron-core axial magnetic field brushless DC motor based on the Halbach structure according to claim 1, it is characterized in that: described rotor case is made of the nonmagnetic substance of high mechanical properties.
4. a kind of non iron-core axial magnetic field brushless DC motor based on the Halbach structure according to claim 1, it is characterized in that: described permanent magnet is selected the NdFeB material of high energy product.
CN2012102868293A 2012-08-13 2012-08-13 Halbach-structure-based iron-core-free axial magnetic field brushless direct-current electromotor Pending CN102904404A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103414301A (en) * 2013-08-15 2013-11-27 南京信息工程大学 Axial magnetic field ironless permanent magnet motor with split mounting type magnetic poles
CN104052221A (en) * 2014-06-12 2014-09-17 江苏大学 Halbach permanent magnetic fault-tolerant motor made from mixed magnetic materials
CN104167893A (en) * 2013-05-17 2014-11-26 胡宪文 Axial direction magnetic flux type electric generator
CN105958687A (en) * 2016-04-27 2016-09-21 霍勇贤 Coreless permanent magnet motor inner rotor capable of magnetic congregate effect and manufacturing method thereof
GB2538515A (en) * 2015-05-19 2016-11-23 Greenspur Renewables Ltd Generator
CN104868671B (en) * 2015-05-12 2018-04-03 北京航空航天大学 A kind of coaxial two section Halbach permanent magnetism synchronous micromotors based on MEMS technology
KR20210013899A (en) * 2019-07-29 2021-02-08 한양대학교 산학협력단 Rotor for maximizing air-gap magnetic flux in slotless motor and slotless motor including the same
CN112688514A (en) * 2020-12-29 2021-04-20 福州大学 Permanent magnet motor with permanent magnet stator and coreless axial magnetic field

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1773817A (en) * 2005-11-11 2006-05-17 沈阳工业大学 AC plate type non-core permasyn motor based on Halbach array
CN101728912A (en) * 2010-02-04 2010-06-09 天津大学 Disk-type permanent magnet synchronous motor used for electric automobile hub based on Halbach structure
CN101958583A (en) * 2009-07-17 2011-01-26 株式会社安川电机 Periodic magnetic field generation device and use its linear motor, rotary-type motor
CN201947136U (en) * 2011-03-11 2011-08-24 珠海格力电器股份有限公司 Axial air gap motor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1773817A (en) * 2005-11-11 2006-05-17 沈阳工业大学 AC plate type non-core permasyn motor based on Halbach array
CN101958583A (en) * 2009-07-17 2011-01-26 株式会社安川电机 Periodic magnetic field generation device and use its linear motor, rotary-type motor
CN101728912A (en) * 2010-02-04 2010-06-09 天津大学 Disk-type permanent magnet synchronous motor used for electric automobile hub based on Halbach structure
CN201947136U (en) * 2011-03-11 2011-08-24 珠海格力电器股份有限公司 Axial air gap motor

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104167893A (en) * 2013-05-17 2014-11-26 胡宪文 Axial direction magnetic flux type electric generator
CN104167893B (en) * 2013-05-17 2018-11-02 胡宪文 Axial flux generator
CN103414301B (en) * 2013-08-15 2016-05-25 南京信息工程大学 A kind of axial magnetic field coreless permanent magnet motor of pin-connected panel magnetic pole
CN103414301A (en) * 2013-08-15 2013-11-27 南京信息工程大学 Axial magnetic field ironless permanent magnet motor with split mounting type magnetic poles
CN104052221A (en) * 2014-06-12 2014-09-17 江苏大学 Halbach permanent magnetic fault-tolerant motor made from mixed magnetic materials
CN104868671B (en) * 2015-05-12 2018-04-03 北京航空航天大学 A kind of coaxial two section Halbach permanent magnetism synchronous micromotors based on MEMS technology
US10637338B2 (en) 2015-05-19 2020-04-28 Time To Act Limited Rotor for permanent magnet generator
GB2538515A (en) * 2015-05-19 2016-11-23 Greenspur Renewables Ltd Generator
CN107980195A (en) * 2015-05-19 2018-05-01 格林斯普可再生能源有限公司 The improved rotor for permanent magnet generator
GB2538515B (en) * 2015-05-19 2021-09-29 Time To Act Ltd Improved rotor for permanent magnet generator
CN105958687A (en) * 2016-04-27 2016-09-21 霍勇贤 Coreless permanent magnet motor inner rotor capable of magnetic congregate effect and manufacturing method thereof
CN105958687B (en) * 2016-04-27 2020-02-14 霍勇贤 Coreless permanent magnet motor inner rotor with magnetism gathering effect and manufacturing method thereof
KR20210013899A (en) * 2019-07-29 2021-02-08 한양대학교 산학협력단 Rotor for maximizing air-gap magnetic flux in slotless motor and slotless motor including the same
KR102242638B1 (en) 2019-07-29 2021-04-20 한양대학교 산학협력단 Rotor for maximizing air-gap magnetic flux in slotless motor and slotless motor including the same
CN112688514A (en) * 2020-12-29 2021-04-20 福州大学 Permanent magnet motor with permanent magnet stator and coreless axial magnetic field
CN112688514B (en) * 2020-12-29 2022-03-11 福州大学 Permanent magnet motor with permanent magnet stator and coreless axial magnetic field

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Application publication date: 20130130