CN103066719B - A kind of magneticfocusing stator permanent magnetic type vernier motor - Google Patents

A kind of magneticfocusing stator permanent magnetic type vernier motor Download PDF

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CN103066719B
CN103066719B CN201210539414.2A CN201210539414A CN103066719B CN 103066719 B CN103066719 B CN 103066719B CN 201210539414 A CN201210539414 A CN 201210539414A CN 103066719 B CN103066719 B CN 103066719B
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stator
tooth
rotor
permanent magnet
permanent
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CN103066719A (en
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吉敬华
赵文祥
赵建兴
朱纪洪
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Changshu Huasen Textile Co.,Ltd.
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Jiangsu University
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Abstract

The present invention discloses a kind of magneticfocusing stator permanent magnetic type vernier motor, rotor is positioned at stator exterior, between rotor and stator, there is air gap, stator has stator tooth and stator slot in the one end near air gap, each stator tooth increment has empty tooth and empty groove, each stator tooth increment two ends are along the circumferential direction empty tooth, more than empty groove number one of virtual number of teeth; An empty groove is embedded with a permanent magnet unit be made up of one piece of radial magnetizing permanent magnetism body and two pieces of cutting orientation magnetizing permanent magnets, one piece of cutting orientation magnetizing permanent magnet is all closely pasted in the both sides of radial magnetizing permanent magnetism body, the magnetizing direction of two pieces of cutting orientation magnetizing permanent magnets in an empty groove is relative, and the polarity of each radial magnetizing permanent magnetism body is consistent; Owing to being provided with empty tooth, therefore can reducing the consumption of permanent magnet, reduce costs; By cooperatively interacting between permanent magnet, teeth portion leakage flux be can effectively reduce, Driving Torque and power density improved.

Description

A kind of magneticfocusing stator permanent magnetic type vernier motor
Technical field
The present invention relates to a kind of motor or generator of high power density, belong to magneto field.
Background technology
Vernier motor has the feature of low speed high torque, therefore has good application in fields such as such as track traffic, Ship Propeling, food processing and electric automobiles.Because rotor permanent magnet type motor is placed on rotor by permanent magnet, this brings certain difficulty to the cooling of motor, and the too high stable operation that can affect motor of temperature, particularly when temperature exceedes the Curie temperature of permanent magnet, then can cause the permanent loss of excitation of permanent magnet, make motor operation troubles.Stator permanent magnetic type electric is placed on stator by permanent magnet, and rotor is without winding also without permanent magnet, and structure is simple, effectively can be reduced the temperature rise of winding and permanent magnet by stator casing cavity water-cooled, improves power of motor density.
Document IEEETRANSACTIONSONMAGNETICS, 47 (10): 4219-4222, 2011(DesignandAnalysisofLinearStatorPermanentMagnetVerni erMachines) describe a kind of orthoscopic stator permanent magnetic type vernier motor, permanent magnet is placed in stator increment, but this stator permanent magnetic type vernier motor is at stator increment, comparatively serious leakage field is there is in rotor increment and air gap, have a strong impact on the useful flux contact area of motor, make the close reduction of motor effective air gap magnetic, the back-emf responded in winding is caused greatly to reduce, thus power density is low compared with the rotor permanent magnet type motor of same volume, motor utilance is low.
Summary of the invention
The object of the invention is to solve that leakage field in existing stator permanent magnetic type vernier motor is serious, in close less, the stator winding of magnetic, back-emf is less, permanent magnet consumption is excessive in air gap problem and propose a kind of magneticfocusing stator permanent magnetic type vernier motor.
The technical solution used in the present invention is: rotor is positioned at stator exterior, between rotor and stator, there is air gap, stator has stator tooth and stator slot in the one end near air gap, each stator tooth increment has empty tooth and empty groove, each stator tooth increment two ends are along the circumferential direction empty tooth, more than empty groove number one of virtual number of teeth; An empty groove is embedded with a permanent magnet unit be made up of one piece of radial magnetizing permanent magnetism body and two pieces of cutting orientation magnetizing permanent magnets, one piece of cutting orientation magnetizing permanent magnet is all closely pasted in the both sides of radial magnetizing permanent magnetism body, the magnetizing direction of two pieces of cutting orientation magnetizing permanent magnets in an empty groove is relative, and the polarity of each radial magnetizing permanent magnetism body is consistent.
The present invention, owing to being provided with empty tooth, therefore can reduce the consumption of permanent magnet, thus reduces the manufacturing cost of motor; Magnetic flux in the present invention provides primarily of the permanent magnet of radial magnetizing, and the magnetic line of force, from permanent magnet, is got back in permanent magnet formed closed loop by air gap, rotor tooth, air gap; By cooperatively interacting between permanent magnet, can effectively reduce teeth portion leakage flux, the magnetic effectively increased in magnetic circuit is close, and improve air gap flux density, therefore in winding, back-emf can effectively improve, and improves Driving Torque and power density.Electric machine structure of the present invention not only can be used as electric rotating machine, can be suitable for too linear electric motors.
Accompanying drawing explanation
Below only in conjunction with the drawings and specific embodiments of five-phase induction motor, the present invention is described:
Fig. 1 is the radial structure schematic diagram of the present invention five phase magneticfocusing stator permanent magnetic type vernier motor;
Fig. 2 is the expansion enlarged drawing of Fig. 1 rotor 2 structure;
Fig. 3 is the partial structurtes enlarged drawing of stator 1 in Fig. 1;
Fig. 4 is the schematic enlarged-scale view of a stator tooth 12 in Fig. 1;
Fig. 5 is traditional five phase stator permanent magnetic type vernier motors and motor winding of the present invention when being concentratred winding, and counter potential waveform contrasts schematic diagram;
Fig. 6 is traditional five phase stator permanent magnetic type vernier motors and motor winding of the present invention when being distributed winding, and counter potential waveform contrasts schematic diagram;
Counter potential waveform contrast schematic diagram during Fig. 7 to be motor winding of the present invention be concentratred winding follows distributed winding;
Fig. 8 is motor A phase winding of the present invention is the connected mode of concentratred winding;
Fig. 9 is motor A phase winding of the present invention is the connected mode of distributed winding;
Figure 10 is the close figure of traditional five phase stator permanent magnetic type vernier motor part magnetic;
Figure 11 is the close figure of motor part magnetic of the present invention;
In figure: 1. stator; 2. rotor; 12. stator tooths; 14. stator slots; 19. grooves; 21. rotor tooths; 22. rotor yokes; 31,32,33. permanent magnets; 101. empty grooves; 102. empty teeth; 300. permanent magnet unit.
Embodiment
See Fig. 1, the present invention comprises coaxial stator 1 and rotor 2, and it is outside that rotor 2 is positioned at stator 1.There is fluting 19 at the center of stator 1, for laying rotating shaft.Have air gap between rotor 2 and stator 1, the thickness of air gap is according to motor size and require got.Stator 1 is made up of stator tooth 12 and stator slot 14, and stator slot 14 is used for placing winding, the increment mosaic magnet unit 300 of stator tooth 12.
Concrete structure and the proportionate relationship of rotor 2 are shown in Fig. 2, and rotor 2 is made up of rotor tooth 21 and rotor yoke 22, and tooth depth and the rotor yoke 22 of rotor tooth 21 can be optimized as required.Rotor tooth 21 is trapezium structure in the face of one end of air gap, and rotor tooth 21 is near the facewidth of air gap side s 1 with the tooth pitch of rotor tooth 21 t p ratio k 1 meet following relational expression: k 1 ( s 1 / T p )=0.2 ~ 0.5; Rotor tooth 21 is near the facewidth of air gap side s 1 with the facewidth of rotor tooth 21 near rotor yoke 22 s 2 ratio meet following relational expression: k 2 ( s 1 / S 2 )=0.1 ~ 0.9, concrete size is determined by motor itself; Rotor tooth 21 is processed by silicon steel plate stacking or permeability magnetic material with the material of rotor yoke 22.)
See shown in Fig. 1,3,4, embedded permanent magnet unit 300 in the increment fluting of stator 1, permanent magnet unit 300 is made up of three permanent magnets 31,32,33.Stator 1 is at also slot near one end of air gap formation tooth slot structure, i.e. stator tooth 12 and stator slot 14.Stator slot 14 can adopt various grooved, chooses according to specific needs.Stator tooth 12 principal character concentrates on its increment.See Fig. 3, if the number of teeth of motor is n, n=1,2,3...... n, at the increment edge fluting of each stator tooth 12, form empty tooth 102 and empty groove 101, virtual number of teeth than empty groove number many one, namely = + 1, each stator tooth 12 increment two ends are along the circumferential direction empty tooth 102.The radian of each empty groove 101 is , the radian of each empty tooth 102 is , empty groove 101 with radian shared by empty tooth 102 is k, K( / )=0.8 ~ 1.1.
Empty groove 101 li is embedded with a permanent magnet unit 300, and as shown in Figure 4, a permanent magnet unit 300 is made up of one piece of radial magnetizing permanent magnetism body 32 and two pieces of cutting orientation magnetizing permanent magnets 31,33.The volume of radial magnetizing permanent magnetism body 32 is greater than the volume of single cutting orientation magnetizing permanent magnet 31,33, radial magnetizing permanent magnetism body 32 is positioned at the centre of empty groove 101, one piece of cutting orientation magnetizing permanent magnet 31,33 is all closely pasted respectively in the both sides of radial magnetizing permanent magnetism body 32, the magnetizing direction of two pieces of cutting orientation magnetizing permanent magnets 31,33 of empty groove 101 li is relative, and the polarity of each radial magnetizing permanent magnetism body 32 is consistent.Magnetizing direction is shown in shown in the arrow on Fig. 4.Cutting orientation magnetizing permanent magnet 31,33 magnet accumulating caps.
Each permanent magnet 31,32,33 is equal along the height of radial direction.The percentage of the radian that the radian shared by radial magnetizing permanent magnetism body 32 accounts for shared by whole permanent magnet unit 300 is , =0.6 ~ 0.9.The percentage of the radian that the radian shared by single cutting orientation magnetizing permanent magnet 31 or 33 accounts for shared by whole permanent magnet unit 300 is , =0.05 ~ 0.2.
Magnetic flux provides primarily of radial magnetizing permanent magnetism body 32, and the magnetic line of force, from permanent magnet unit 300s, by air gap, just to rotor tooth 21, to be got back to permanent magnet unit 300 through air gap from other rotor tooth 21 and formed closed loop; Cutting orientation magnetizing permanent magnet 31,33 plays a part to reduce leakage field.
Permanent magnet unit 300 produces the number of pole-pairs of Distribution of Magnetic Field pwith radial magnetizing permanent magnetism body 32 number with rotor tooth 21 number coordinate relevant, the difference of the absolute value of the two is exactly the number of pole-pairs of Distribution of Magnetic Field p, be formulated and be exactly: .If radial magnetizing permanent magnetism body 32 number be 50, rotor tooth 21 number be 59, so permanent magnet produces the number of pole-pairs p in magnetic field is exactly 9; If remain unchanged, rotor tooth 21 number be 41, the number of pole-pairs p that permanent magnet produces magnetic field is also 9.
Motor of the present invention can be designed to single-phase or polyphase machine as required, every phase winding can adopt to be concentrated or distributed winding, what it may be noted that is exactly: if do not change other condition, only change the connected mode of winding, the back electromotive force that distributed winding produces will be far longer than concentratred winding.In addition, for distributed winding, number of pole-pairs is more, and the back electromotive force responded in winding is less.And concentratred winding is to this in confused situation aobvious.
The counter potential waveform figure that Fig. 5 is the winding of traditional five phase stator permanent magnet vernier motors (A1 wavy line) and motor of the present invention (A2 wavy line) when being concentratred winding.Can see when same size, traditional five phase stator permanent magnetic type vernier motor back-emf amplitudes are about 60V, and the back-emf amplitude of motor of the present invention is more than 130V.
The counter potential waveform figure that Fig. 6 is the winding of traditional five phase stator permanent magnet vernier motors (A wavy line) and motor of the present invention (B wavy line) when being distributed winding, when keeping all the other parameter constants, the back-emf amplitude can seeing traditional five mutually common stator permanent magnet vernier motors is about 240V, and the back-emf amplitude of motor of the present invention can more than 500V.
Fig. 7 is the winding of motor of the present invention is that distributed winding (B1 wavy line) is with counter potential waveform figure time concentratred winding (B2 wavy line), can see and not change its other condition, only change winding connection, the back-emf of distributed winding will much larger than concentratred winding.
The connected mode of Fig. 8, Fig. 9 to be motor A phase winding of the present invention be concentratred winding and distributed winding.A+ represent into, A-indicates.51,52,54,55 End winding is represented respectively.The contrast magnetic line of force 41 of Figure 10 and the magnetic line of force 42 of Figure 11 can be seen, motor of the present invention effectively can reduce leakage field, increase the power density of motor.

Claims (3)

1. a magneticfocusing stator permanent magnetic type vernier motor, it is outside that rotor (2) is positioned at stator (1), between rotor (2) and stator (1), there is air gap, it is characterized in that: stator (1) has stator tooth (12) and stator slot (14) in the one end near air gap, winding is placed in stator slot (14), each stator tooth (12) increment has empty tooth (102) and empty groove (101), and each stator tooth (12) increment two ends are along the circumferential direction empty tooth (102), more than empty groove number one of virtual number of teeth, an empty groove (101) is embedded with one by one piece of radial magnetizing permanent magnetism body (32) and two pieces of cutting orientation magnetizing permanent magnets (31, 33) permanent magnet unit (300) formed, the volume of radial magnetizing permanent magnetism body (32) is greater than single cutting orientation magnetizing permanent magnet (31, 33) volume, the both sides of radial magnetizing permanent magnetism body (32) all fit tightly one piece of cutting orientation magnetizing permanent magnet (31, 33), two pieces of cutting orientation magnetizing permanent magnets (31 that an empty groove (101) is inner, 33) magnetizing direction is relative, the polarity of each radial magnetizing permanent magnetism body (32) is consistent, one piece of radial magnetizing permanent magnetism body (32) and two pieces of cutting orientation magnetizing permanent magnets (31, 33) height along radial direction is all equal,
Rotor (2) is made up of rotor tooth (21) and rotor yoke (22), rotor tooth (21) is trapezium structure in the face of one end of air gap, rotor tooth (21) is 0.2 ~ 0.5 near the ratio of the facewidth of air gap side and the tooth pitch of rotor tooth (21), and the facewidth and the rotor tooth (21) of the close air gap side of rotor tooth (21) are 0.1 ~ 0.9 near the ratio of the facewidth of rotor yoke (22);
Permanent magnet unit (300) produces the number of pole-pairs of Distribution of Magnetic Field , radial magnetizing permanent magnetism body (32) number, it is rotor tooth (21) number;
Magnetic flux is provided by radial magnetizing permanent magnetism body (32), and from permanent magnet unit, (300)s, by air gap, just to rotor tooth (21), got back to formation closed-loop path permanent magnet unit (300) from other rotor tooth (21) through air gap to the magnetic line of force.
2. a kind of magneticfocusing stator permanent magnetic type vernier motor according to claim 1, it is characterized in that: the ratio that the shared radian of radial magnetizing permanent magnetism body (32) accounts for the shared radian of permanent magnet unit (300) is 0.6 ~ 0.9, the ratio that the shared radian of single cutting orientation magnetizing permanent magnet (31,33) accounts for the shared radian of permanent magnet unit (300) is 0.05 ~ 0.2.
3. a kind of magneticfocusing stator permanent magnetic type vernier motor according to claim 1, is characterized in that: the ratio of the shared radian of empty groove (101) and the shared radian of empty tooth (102) is 0.8 ~ 1.1.
CN201210539414.2A 2012-12-14 2012-12-14 A kind of magneticfocusing stator permanent magnetic type vernier motor Active CN103066719B (en)

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Families Citing this family (12)

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Publication number Priority date Publication date Assignee Title
CN103490534B (en) * 2013-09-27 2016-06-29 江苏大学 A kind of stator permanent magnetic type vernier motor structure reducing detent force
CN103490577A (en) * 2013-09-27 2014-01-01 江苏大学 Stator permanent magnet vernier motor with modules evenly distributed at circumference
CN103647423A (en) * 2013-11-28 2014-03-19 江苏大学 Stator and rotor permanent magnet-type vernier motor
CN103795159B (en) * 2014-01-03 2016-02-10 东南大学 The two permanent-magnet type vernier motor of rotor
CN105071620B (en) * 2015-08-26 2018-08-07 江苏大学 A kind of built-in permanent magnetic error-tolerance type vernier motor having poly- magnetic effect
CN106505821A (en) * 2016-09-19 2017-03-15 江苏大学 A kind of primary permanent magnet vernier linear electric motors and its dividing method
CN106849401B (en) * 2017-02-15 2019-04-02 江苏大学 A kind of flywheel energy storage motor for electric vehicle
CN109104009A (en) * 2018-08-31 2018-12-28 重庆大学 A kind of birotor permanent magnetic vernier motor
CN108900055A (en) * 2018-09-06 2018-11-27 无锡力必特自动化设备有限公司 A kind of carnassial tooth stator/rotor permanent magnet vernier motor of uneven arrangement
CN109378918A (en) * 2018-12-04 2019-02-22 西安交通大学 A kind of double permanent magnetism vernier motors of DC bias current type rotor
CN110880821A (en) * 2019-11-29 2020-03-13 西安交通大学 Rotor permanent magnet vernier motor with hybrid excitation
US20210175785A1 (en) * 2019-12-05 2021-06-10 Whirlpool Corporation Direct drive electric motor having stator and magnet configurations for improved torque capability

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