CN102570754A - Permanent-magnet cursor motor for realizing low speed and high torque - Google Patents

Permanent-magnet cursor motor for realizing low speed and high torque Download PDF

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Publication number
CN102570754A
CN102570754A CN2012100138347A CN201210013834A CN102570754A CN 102570754 A CN102570754 A CN 102570754A CN 2012100138347 A CN2012100138347 A CN 2012100138347A CN 201210013834 A CN201210013834 A CN 201210013834A CN 102570754 A CN102570754 A CN 102570754A
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CN
China
Prior art keywords
permanent magnet
magnetic flux
permanent
wehnelt electrode
stator
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Pending
Application number
CN2012100138347A
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Chinese (zh)
Inventor
樊英
金小香
黄进
张丽
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Southeast University
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Southeast University
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Priority to CN2012100138347A priority Critical patent/CN102570754A/en
Publication of CN102570754A publication Critical patent/CN102570754A/en
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Abstract

The invention discloses a permanent-magnet cursor motor for realizing low speed and high torque. The permanent-magnet cursor motor comprises an external rotor, permanent-magnet units, a stator body, magnetic flux modulation pole units, stator slots, a motor shaft, stator teeth, bearings, rotor yokes and windings, wherein each permanent-magnet unit comprises a first permanent magnet, a second permanent magnet and a third permanent magnet; the second permanent magnet is magnetized in radial direction; the magnetization direction of the first permanent magnet and the magnetization direction of the second permanent magnet are in axial symmetry around the magnetization direction of the second permanent magnet; the stator teeth are fixedly connected with the magnetic flux modulation pole units; each magnetic flux modulation pole unit comprises a first magnetic flux modulation pole, a second magnetic flux modulation pole and a third magnetic flux modulation pole; and a sum of the number nr of pole pairs of the permanent-magnet units and the number np of the pole pairs of the windings are equal to the number ns of magnetic flux modulation poles of all magnetic flux modulation pole units. By adoption of the permanent-magnet cursor motor, effective magnetic-field harmonic components can be effectively enlarged, output torque can be effectively improved, and the magnetic flux density of the magnetic yokes and the loss of the iron core are reduced.

Description

A kind of permanent magnetism vernier motor that is used for low speed high torque
Technical field
The present invention relates to a kind of motor, specifically, relate to a kind of permanent magnetism vernier motor that is used for low speed high torque.
Background technology
Traditional direct driving motor mainly comprises magnetic gear external rotor, adjustable magnetic ring, magnetic gear internal rotor and motor stator; Between magnetic gear external rotor and the adjustable magnetic ring one deck air gap is arranged; Between adjustable magnetic ring and the magnetic gear internal rotor one deck air gap is arranged; Between motor stator and the magnetic gear internal rotor one deck air gap is arranged also, have three layers of air gap.External rotor permanent magnet vernier motor is a kind of novel direct drive formula motor that proposes recently, mainly comprises external rotor, external rotor permanent magnet body, magnetic flux Wehnelt electrode and internal stator.The external rotor permanent magnet body adopts common radial magnetizing, and the magnetic flux Wehnelt electrode is placed in the stator tooth top.Introducing through magnetic flux Wehnelt electrode on the stator; Saved the adjustable magnetic ring structure in traditional magnetic gear; Internal rotor and adjustable magnetic ring structure independently in traditional magnetic gear have been saved; Make apparatus structure more simple, solved mechanical gear drive system noise height, problems such as efficient is low, transmission precision is low, low-response, mechanical wear.But the permanent magnetism vernier motor flux leakage of this structure is bigger, and core loss is bigger, and power factor (PF) is lower, and efficient is not high.
Summary of the invention
Technical problem:Technical problem to be solved by this invention provides a kind of permanent magnetism vernier motor that is used for low speed high torque, and this permanent magnetism vernier motor can effectively improve magnetic field harmonic wave composition and output torque, reduces the magnetic flux density of rotor yoke, reduces core loss.
Technical scheme:For solving the problems of the technologies described above; The permanent magnetism vernier motor that is used for low speed high torque that the present invention adopts, this motor comprises external rotor, permanent magnet unit, stator body, magnetic flux Wehnelt electrode unit, stator slot, motor shaft, stator tooth, bearing, rotor yoke and winding; Wherein, external rotor is positioned at the outside of stator body, and external rotor is rotatably connected through bearing and motor shaft, and motor shaft is fixed in the inner chamber of stator body; The inner surface of external rotor is along being circumferentially with rotor yoke, and each permanent magnet unit is embedded in the rotor yoke; Each permanent magnet unit comprises along tactic first permanent magnet of outer rotor circumferential, second permanent magnet and the 3rd permanent magnet; Second permanent magnet is between first permanent magnet and the 3rd permanent magnet; And the magnetizing direction of second permanent magnet is a radial magnetizing; The magnetizing direction of the magnetizing direction of first permanent magnet and the 3rd permanent magnet is an axle with the magnetizing direction of second permanent magnet, symmetrically; Be circumferentially with the stator tooth with equal length that radially extends along stator body, winding is twined on the stator tooth surface; Each stator tooth one end is fixedly connected with stator body, and each stator tooth other end is fixedly connected with a magnetic flux Wehnelt electrode unit; Each magnetic flux Wehnelt electrode unit comprises the first magnetic flux Wehnelt electrode, the second magnetic flux Wehnelt electrode and the 3rd magnetic flux Wehnelt electrode of circumferentially arranging in proper order along stator body; The spacing of adjacent magnetic flux Wehnelt electrode equates in each magnetic flux Wehnelt electrode unit, and this spacing equates with distance between the adjacent magnetic flux Wehnelt electrode unit; Form stator slot between the adjacent stator tooth; Gapped between magnetic flux Wehnelt electrode unit and the external rotor; Permanent magnet unit number of pole-pairs n rWith winding number of pole-pairs n pSum equals the number n of the magnetic flux Wehnelt electrode of all magnetic flux Wehnelt electrode unit s
Beneficial effect:Compared with prior art, the present invention has following beneficial effect:
1. effectively improve magnetic field harmonic wave composition and output torque, reduce the magnetic flux density of rotor yoke, reduce core loss.Each permanent magnet unit provided by the invention comprises first permanent magnet, second permanent magnet and the 3rd permanent magnet; And the magnetizing direction of second permanent magnet is a radial magnetizing; The magnetizing direction of the magnetizing direction of first permanent magnet and the 3rd permanent magnet is an axle with the magnetizing direction of second permanent magnet, symmetrically.This permanent magnet unit adopts the Halbach permanent magnet array, utilizes finite element optimization adjustment permanent magnet width ratio and magnetizing direction, can reduce the magnetic flux density of rotor yoke, increases air gap flux density.Therefore this permanent magnetism vernier motor can provide bigger effective magnetic field harmonic wave composition and output torque, reduces the size of rotor yoke, reduces core loss, thereby has improved efficiency of motor.Simultaneously, isolate through iron core between the external rotor permanent magnet body, blocked flowing each other of eddy current in each permanent magnet, reduced the eddy current loss in the permanent magnet in the external rotor.
2. compact conformation, functional reliability is strong.Permanent magnetism vernier motor provided by the invention has saved the mechanical speed-changing gear case, does not have mechanical wear, maintenance and the noise problem of gear box, has improved the reliability of machine operation.Simultaneously, at an end of stator tooth magnetic flux Wehnelt electrode unit is set, each magnetic flux Wehnelt electrode unit comprises the first magnetic flux Wehnelt electrode, the second magnetic flux Wehnelt electrode and the 3rd magnetic flux Wehnelt electrode totally three magnetic flux Wehnelt electrodes.Substitute adjustable magnetic ring and an internal rotor of magnetic gear in traditional magnetic gear structure with magnetic flux Wehnelt electrode unit, thereby made permanent magnetism vernier electric machine structure of the present invention compact, smaller volume, manufacturing cost reduces.In addition, rotor in the motor of the present invention adopts high energy product neodymium iron boron excitation, does not have slip ring and brush, need not the additional power source excitation, have simple in structure, power density is high, efficient is high and advantage such as good reliability.
3. this motor is convenient to regulate, and is applicable to the running environment of various low speed high torques.In the permanent magnetism vernier motor that this patent provides, winding number of pole-pairs n pWith permanent magnet unit number of pole-pairs n rRatio be the attainable speed no-load voltage ratio of this motor.Through suitable selection permanent magnet unit number of pole-pairs n rNumber n with the magnetic flux Wehnelt electrode s, can be applicable to the different occasions that needs low-speed direct driving.
Description of drawings
Fig. 1 is an axial cutaway view of the present invention.
Fig. 2 is the assembly structure figure of stator, external rotor and motor shaft among the present invention.
Fig. 3 is the external rotor part permanent magnet unit magnetizing direction sketch map among the present invention, and the arrow direction is the magnetizing direction of this permanent magnet among the figure.
Have among the figure: external rotor 1, permanent magnet unit 2, first permanent magnet 201, second permanent magnet 202, the 3rd permanent magnet 203, stator body 3, magnetic flux Wehnelt electrode unit 4, the first magnetic flux Wehnelt electrode 401, the second magnetic flux Wehnelt electrode 402, the 3rd magnetic flux Wehnelt electrode 403, stator slot 5, motor shaft 6, stator tooth 7, bearing 8, rotor yoke 9, winding 10.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is specifically set forth.
Extremely shown in Figure 3 like Fig. 1; A kind of permanent magnetism vernier motor that is used for low speed high torque of the present invention comprises external rotor 1, permanent magnet unit 2, stator body 3, magnetic flux Wehnelt electrode unit 4, stator slot 5, motor shaft 6, stator tooth 7, bearing 8, rotor yoke 9 and winding 10.External rotor 1 is positioned at the outside of stator body 3.External rotor 1 is rotatably connected through bearing 8 and motor shaft 6.Motor shaft 6 is fixed in the inner chamber of stator body 3.The inner surface of external rotor 1 is along being circumferentially with rotor yoke 9, and each permanent magnet unit 2 is embedded in the rotor yoke 9.Each permanent magnet unit 2 comprises along circumferentially tactic first permanent magnet 201 of external rotor 1, second permanent magnet 202 and the 3rd permanent magnet 203.Second permanent magnet 202 is between first permanent magnet 201 and the 3rd permanent magnet 203, and sidewall relative between the adjacent permanent magnet is fitted each other.The magnetizing direction of second permanent magnet 202 is a radial magnetizing, and the magnetizing direction of the magnetizing direction of first permanent magnet 201 and the 3rd permanent magnet 203 is an axle with the magnetizing direction of second permanent magnet 202, symmetrically.The angle of the magnetizing direction of the magnetizing direction of first permanent magnet 201 and second permanent magnet 202 is preferably greater than 0 degree, less than 90 degree.For example, when the angle of the magnetizing direction of the magnetizing direction of first permanent magnet 201 and second permanent magnet 202 is 45 when spending, the angle of the magnetizing direction of the magnetizing direction of the 3rd permanent magnet 203 and second permanent magnet 202 also is 45 degree.The equal scalable of the width of each permanent magnet and magnetizing direction is to reach required power output.Be circumferentially with the stator tooth with equal length 7 that radially extends along stator body 3.Winding 10 is twined on stator tooth 7 surfaces.Each stator tooth 7 one end is fixedly connected with stator body 3, and each stator tooth 7 other end is fixedly connected with a magnetic flux Wehnelt electrode unit 4.The spacing of adjacent stator tooth 7 equates.Each magnetic flux Wehnelt electrode unit 4 comprises along the circumferential order first magnetic flux Wehnelt electrode 401, the second magnetic flux Wehnelt electrode 402 and the 3rd magnetic flux Wehnelt electrode 403 of arranging of stator body 3.The spacing of adjacent magnetic flux Wehnelt electrode equates in each magnetic flux Wehnelt electrode unit 4.That is to say between the first magnetic flux Wehnelt electrode 401, the second magnetic flux Wehnelt electrode 402 and the 3rd magnetic flux Wehnelt electrode 403 gappedly, and the distance of the first magnetic flux Wehnelt electrode 401 and the second magnetic flux Wehnelt electrode 402 equates with the distance of the second magnetic flux Wehnelt electrode 402 and the 3rd magnetic flux Wehnelt electrode 403.Distance between the adjacent magnetic flux Wehnelt electrode unit 4 equates, and the distance between the adjacent magnetic flux Wehnelt electrode unit 4 equals the distance of magnetic flux Wehnelt electrode adjacent in each magnetic flux Wehnelt electrode unit 4.Form stator slot 5 between the adjacent stator tooth 7.Gapped between magnetic flux Wehnelt electrode unit 4 and the external rotor 1.Permanent magnet unit 2 number of pole-pairs n rWith winding 10 number of pole-pairs n pSum equals the number n of the magnetic flux Wehnelt electrode of all magnetic flux Wehnelt electrode unit 4 s, i.e. n sBe three times of number of magnetic flux Wehnelt electrode unit 4.
Further, described permanent magnet unit 2 is processed for NdFeB material.NdFeB material is the highest permanent magnetic material of present magnetic property, uses NdFeB material to process permanent magnet unit 2, can increase the magnetic of permanent magnet unit 2.Described external rotor 1, stator body 3, stator tooth 7 and magnetic flux Wehnelt electrode 4 are processed by silicon steel sheet, and motor shaft 6 is processed by non-magnet_conductible material.
The operation principle of permanent magnetism vernier motor of the present invention is the space magnetic field modulation principle of magnetic gear adjustable magnetic ring, utilizes space harmonics to transmit energy, both may operate in motoring condition, also may operate in generating state.
When this motor operates in motoring condition; Pass to the alternating current of certain frequency to being wrapped in winding 10 on the stator body 3, the rotating magnetic field angular speed that the electric current in the winding 10 produces is .Modulating action through magnetic flux Wehnelt electrode unit 4; Produce a modulating wave magnetic field in the air gap between magnetic flux Wehnelt electrode unit 4 and external rotor 1, its angular velocity of rotation is- ."-" expression modulating wave magnetic field among- is opposite with the direction of rotation in armature winding 10 magnetic fields.This modulating wave magnetic field interacts with the permanent magnet unit 2 that is embedded in rotor yoke 9, drives external rotor 1 and rotates synchronously.Change the frequency that feeds winding 10 electric currents; Thereby realize different angular speed ; And then obtain different external rotors 1 rotary speed- , realize that speed governing drives. : Be the speed no-load voltage ratio, equal permanent magnet unit 2 number of pole-pairs n rWith winding 10 number of pole-pairs n pThe ratio.Therefore, this motor can be applicable to the occasion that needs low speed high torque, satisfies the requirement of when low speed, big torque being exported.
When this motor operates in generating state; External rotor 1 rotates with angular speed- ; The rotating magnetic field that external rotor 1 produces; Through the modulating action of magnetic flux Wehnelt electrode unit 4, producing angular velocity of rotation is the magnetic field of .This magnetic field produces relative motion with the winding 10 that is wrapped on the stator body 3, and cutting winding 10 leads produce electric energy. : Be the speed no-load voltage ratio, equal permanent magnet unit 2 number of pole-pairs n rWith winding 10 number of pole-pairs n pThe ratio.Generally, permanent magnet unit 2 number of pole-pairs n rGreater than winding 10 number of pole-pairs n pSo,, this can realize motor generator operation under low-speed conditions, so this motor also can be applicable to the occasion of wind power generation.
In the permanent magnetism vernier motor of this structure; Permanent magnet unit 2 adopts special Halbach array; Utilize finite element optimization adjustment permanent magnet width ratio and magnetizing direction, bigger effective magnetic field harmonic wave composition and output torque can be provided, reduce the magnetic flux density and the core loss of rotor yoke.

Claims (4)

1. permanent magnetism vernier motor that is used for low speed high torque; It is characterized in that this motor comprises external rotor (1), permanent magnet unit (2), stator body (3), magnetic flux Wehnelt electrode unit (4), stator slot (5), motor shaft (6), stator tooth (7), bearing (8), rotor yoke (9) and winding (10); Wherein,
External rotor (1) is positioned at the outside of stator body (3), and external rotor (1) is rotatably connected through bearing (8) and motor shaft (6), and motor shaft (6) is fixed in the inner chamber of stator body (3); The inner surface of external rotor (1) is along being circumferentially with rotor yoke (9), and each permanent magnet unit (2) is embedded in the rotor yoke (9); Each permanent magnet unit (2) comprises along circumferential tactic first permanent magnet (201) of external rotor (1), second permanent magnet (202) and the 3rd permanent magnet (203); Second permanent magnet (202) is positioned between first permanent magnet (201) and the 3rd permanent magnet (203); And the magnetizing direction of second permanent magnet (202) is a radial magnetizing; The magnetizing direction of the magnetizing direction of first permanent magnet (201) and the 3rd permanent magnet (203) is an axle with the magnetizing direction of second permanent magnet (202), symmetrically; Be circumferentially with the stator tooth with equal length (7) that radially extends along stator body (3), winding (10) is twined on stator tooth (7) surface; Each stator tooth (7) one end is fixedly connected with stator body (3), and each stator tooth (7) other end is fixedly connected with a magnetic flux Wehnelt electrode unit (4); Each magnetic flux Wehnelt electrode unit (4) comprises the first magnetic flux Wehnelt electrode (401), the second magnetic flux Wehnelt electrode (402) and the 3rd magnetic flux Wehnelt electrode (403) of circumferentially arranging in proper order along stator body (3); The spacing of adjacent magnetic flux Wehnelt electrode equates in each magnetic flux Wehnelt electrode unit (4), and this spacing equates with distance between the adjacent magnetic flux Wehnelt electrode unit (4); Form stator slot (5) between the adjacent stator tooth (7); Gapped between magnetic flux Wehnelt electrode unit (4) and the external rotor (1); Permanent magnet unit (2) number of pole-pairs n rWith winding (10) number of pole-pairs n pSum equals the number n of the magnetic flux Wehnelt electrode of all magnetic flux Wehnelt electrode unit (4) s
2. the permanent magnetism vernier motor that is used for low speed high torque according to claim 1 is characterized in that described permanent magnet unit (2) is processed by NdFeB material.
3. the permanent magnetism vernier motor that is used for low speed high torque according to claim 1; It is characterized in that; Described external rotor (1), stator body (3), stator tooth (7) and magnetic flux Wehnelt electrode (4) are processed by silicon steel sheet, and motor shaft (6) is processed by non-magnet_conductible material.
4. the permanent magnetism vernier motor that is used for low speed high torque according to claim 1; It is characterized in that; In the described permanent magnet unit (2), the angle of the magnetizing direction of the magnetizing direction of first permanent magnet (201) and second permanent magnet (202) is greater than 0 degree, less than 90 degree.
CN2012100138347A 2012-01-17 2012-01-17 Permanent-magnet cursor motor for realizing low speed and high torque Pending CN102570754A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103066719A (en) * 2012-12-14 2013-04-24 江苏大学 Magnetic gathering type stator permanent magnetic type vernier motor
CN103647423A (en) * 2013-11-28 2014-03-19 江苏大学 Stator and rotor permanent magnet-type vernier motor
CN106849409A (en) * 2016-11-11 2017-06-13 南方电机科技有限公司 A kind of motor including HALBACH arrays and the equipment including the motor
CN106998126A (en) * 2017-04-28 2017-08-01 鲁东大学 A kind of transverse magnetic flux magnetic-field modulation-type linear electric motors
CN107070167A (en) * 2017-04-28 2017-08-18 鲁东大学 A kind of transverse magnetic flux magnetic-field modulation-type linear electric motors
WO2018086595A1 (en) * 2016-11-11 2018-05-17 南方电机科技有限公司 High-torque electric motor and robot comprising same
CN108988598A (en) * 2018-08-31 2018-12-11 重庆大学 Flux modulation formula permanent magnetism vernier motor built in a kind of stator
CN110112878A (en) * 2019-04-24 2019-08-09 华中科技大学 A kind of extremely tangential excitation vernier magneto of alternating

Citations (4)

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Publication number Priority date Publication date Assignee Title
US4280072A (en) * 1977-05-26 1981-07-21 Matsushita Electric Industrial Co., Ltd. Rotating electric machine
CN1537354A (en) * 2001-08-08 2004-10-13 ���µ�����ҵ��ʽ���� Brushless motor using vernier structure
JP2005269795A (en) * 2004-03-19 2005-09-29 Matsushita Electric Ind Co Ltd Brushless motor
CN201956858U (en) * 2011-01-07 2011-08-31 东南大学 Magnetic field modulating type Halbach permanent magnet direct drive motor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4280072A (en) * 1977-05-26 1981-07-21 Matsushita Electric Industrial Co., Ltd. Rotating electric machine
CN1537354A (en) * 2001-08-08 2004-10-13 ���µ�����ҵ��ʽ���� Brushless motor using vernier structure
JP2005269795A (en) * 2004-03-19 2005-09-29 Matsushita Electric Ind Co Ltd Brushless motor
CN201956858U (en) * 2011-01-07 2011-08-31 东南大学 Magnetic field modulating type Halbach permanent magnet direct drive motor

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103066719A (en) * 2012-12-14 2013-04-24 江苏大学 Magnetic gathering type stator permanent magnetic type vernier motor
CN103066719B (en) * 2012-12-14 2016-01-20 江苏大学 A kind of magneticfocusing stator permanent magnetic type vernier motor
CN103647423A (en) * 2013-11-28 2014-03-19 江苏大学 Stator and rotor permanent magnet-type vernier motor
WO2018086586A1 (en) * 2016-11-11 2018-05-17 南方电机科技有限公司 Motor comprising halbach array and apparatus comprising same
CN106849409A (en) * 2016-11-11 2017-06-13 南方电机科技有限公司 A kind of motor including HALBACH arrays and the equipment including the motor
WO2018086595A1 (en) * 2016-11-11 2018-05-17 南方电机科技有限公司 High-torque electric motor and robot comprising same
EP3528366A4 (en) * 2016-11-11 2020-05-27 Novomoto Limited Motor comprising halbach array and apparatus comprising same
CN106849409B (en) * 2016-11-11 2020-10-30 南方电机科技有限公司 Motor comprising HALBACH array and equipment comprising motor
CN106998126A (en) * 2017-04-28 2017-08-01 鲁东大学 A kind of transverse magnetic flux magnetic-field modulation-type linear electric motors
CN107070167A (en) * 2017-04-28 2017-08-18 鲁东大学 A kind of transverse magnetic flux magnetic-field modulation-type linear electric motors
CN106998126B (en) * 2017-04-28 2019-09-27 鲁东大学 A kind of transverse magnetic flux magnetic-field modulation-type linear motor
CN107070167B (en) * 2017-04-28 2019-10-01 鲁东大学 A kind of transverse magnetic flux magnetic-field modulation-type linear motor
CN108988598A (en) * 2018-08-31 2018-12-11 重庆大学 Flux modulation formula permanent magnetism vernier motor built in a kind of stator
CN108988598B (en) * 2018-08-31 2020-11-10 重庆大学 Magnetic flux modulation type permanent magnet vernier motor with built-in stator
CN110112878A (en) * 2019-04-24 2019-08-09 华中科技大学 A kind of extremely tangential excitation vernier magneto of alternating

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Application publication date: 20120711