CN110808673A - Novel double-stator Halbach alternating pole permanent magnet vernier motor - Google Patents

Novel double-stator Halbach alternating pole permanent magnet vernier motor Download PDF

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Publication number
CN110808673A
CN110808673A CN201911250622.9A CN201911250622A CN110808673A CN 110808673 A CN110808673 A CN 110808673A CN 201911250622 A CN201911250622 A CN 201911250622A CN 110808673 A CN110808673 A CN 110808673A
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stator
rotor
permanent magnet
halbach
permanent magnets
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CN201911250622.9A
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CN110808673B (en
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李建贵
陈豪
刘璟轩
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Wuhan University of Technology WUT
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Wuhan University of Technology WUT
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H02K16/04—Machines with one rotor and two stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/17—Stator cores with permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

The invention discloses a novel double-stator Halbach alternating pole permanent magnet vernier motor which comprises a first stator structure, a second stator structure and a rotor structure, wherein the rotor structure is arranged between the first stator structure and the second stator structure; the first stator structure and the second stator structure are stator structures with the same structure and respectively comprise a stator core, stator slots and stator teeth are uniformly arranged at intervals in the circumferential direction of the stator core, armature windings are embedded in the stator slots, the end parts of the stator teeth are divided into two modulation poles, and Halbach permanent magnet arrays are arranged between the modulation poles; the rotor structure comprises a rotor core, rotor slots are formed in the circumferential direction of the rotor core at equal intervals, and rotor permanent magnets are embedded between the rotor slots. The invention improves the air gap flux density of the motor, effectively reduces the flux leakage, and simultaneously achieves the purposes of reducing the use amount of permanent magnets and enhancing the mechanical structure strength of the rotor.

Description

Novel double-stator Halbach alternating pole permanent magnet vernier motor
Technical Field
The invention relates to the technical field of motors, in particular to a novel double-stator Halbach alternating pole permanent magnet vernier motor.
Background
A Vernier permanent magnet motor (Vernier PM motor) is a novel motor based on a magnetic field modulation theory which is gradually developed in recent years, the topology of the motor has the advantages of ultrahigh power density and simple mechanical structure, and the motor is well applied to the fields of rail transit, ship propulsion, electric automobiles and the like.
Currently, a related art of a permanent magnet vernier motor has appeared. The application number is 201310069627.8, the invention is named as a radial magnetic field double-stator vernier motor, and provides a radial magnetic field double-stator vernier motor, which improves the power factor and the power density of the vernier motor by a sleeving arrangement mode of a rotor and two stators and setting the relative position relation of stator teeth and rotor pole shoes. The application number is CN201410321107.6, the invention name is 'a double-stator permanent magnet vernier wind driven generator', and the double-stator permanent magnet vernier wind driven generator is provided, and generates a highly sinusoidal air gap magnetic field through a vernier effect and a Halbach structure permanent magnet on a rotor. The invention discloses a disk type low-speed high-torque permanent magnet vernier motor with the application number of 201210013800.8. The Halbach array permanent magnet is adopted to provide larger effective magnetic field harmonic components and output torque, and the magnetic flux density and the iron core loss of a rotor magnetic yoke are reduced.
In summary, the radial magnetic field double-stator vernier motor has a large size, large loss and heat generation per unit volume, and the cylindrical structure limits the heat dissipation capability. Although the shaft type motor has a compact axial size, provides a large radiating surface and provides a space for increasing the power density of the motor, the air gap is large, and the magnetic leakage of the motor is serious. The common permanent magnet structure of the motor rotor has poor mechanical strength and is not suitable for the working condition of low speed and large torque. The device uses the alternating pole rotor structure to match with the Halbach array, improves the air gap flux density of the disc type motor, and simultaneously achieves the purposes of reducing the consumption of the permanent magnet and enhancing the mechanical structure strength of the rotor.
Disclosure of Invention
The invention aims to solve the technical problems of large air gap, serious magnetic leakage and the like in the prior art and provides a novel double-stator Halbach alternating pole permanent magnet vernier motor.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the novel double-stator Halbach alternating pole permanent magnet vernier motor comprises a first stator structure, a second stator structure and a rotor structure, wherein the rotor structure is arranged between the first stator structure and the second stator structure, and the distances from the rotor structure to the first stator structure and the second stator structure are equal;
the first stator structure and the second stator structure are stator structures with the same structure and respectively comprise a stator core, stator slots and stator teeth are uniformly arranged at intervals in the circumferential direction of the stator core, armature windings are embedded in the stator slots, the end parts of the stator teeth are divided into two modulation poles, and Halbach permanent magnet arrays are arranged between the modulation poles;
the rotor structure comprises a rotor core, rotor slots are formed in the circumferential direction of the rotor core at equal intervals, and rotor permanent magnets are embedded between the rotor slots.
The Halbach permanent magnet array comprises a plurality of Halbach permanent magnets which are circumferentially arranged, the Halbach permanent magnet array comprises stator axial permanent magnets and two stator circumferential permanent magnets, the stator axial permanent magnets are magnetized in the axial direction and are arranged between the two stator circumferential permanent magnets, and the stator circumferential permanent magnets are magnetized in the radial tangential direction.
According to the technical scheme, the number of pole pairs of the Halbach permanent magnet array is equal to the number of the modulation poles, and the number of the modulation poles, the number of pole pairs of the armature winding and the number of pole pairs of the rotor permanent magnet satisfy the following relation:
Ps-Pw＝Pr (1)
wherein, Ps is the number of modulation poles, Pw is the pole pair number of the armature winding, and Pr is the pole pair number of the rotor permanent magnet.
According to the technical scheme, the magnetization directions of the axial permanent magnets on the Halbach permanent magnet arrays on the first stator structure and the second stator structure are the same, and the magnetization directions of the circumferential permanent magnets on the Halbach permanent magnet arrays on the first stator structure and the second stator structure are opposite.
According to the technical scheme, the magnetization direction of the rotor permanent magnet is the same as the magnetization direction of the axial permanent magnet on the Halbach permanent magnet array on the stator structure.
According to the technical scheme, the center of the rotor core is provided with a shaft hole, and a key groove is formed in the shaft hole.
According to the technical scheme, the stator iron core and the rotor iron core are made of high-permeability silicon steel.
According to the technical scheme, the stator axial permanent magnet, the stator circumferential permanent magnet and the rotor permanent magnet are made of neodymium iron boron.
The invention has the following beneficial effects: according to the novel double-stator Halbach alternating pole permanent magnet vernier motor device, the rotor structure is arranged between the two stator structures with the same structure, so that the alternating pole permanent magnet magnetic field can be effectively utilized, the magnetic leakage is reduced, the torque is improved, and the unilateral axial force of a disc type motor can be effectively offset. Stator teeth on the stator core are split into two modulation poles at the end part, Halbach permanent magnet arrays are arranged between the modulation poles, rotor slots are formed in the rotor core at equal intervals in the circumferential direction, and rotor permanent magnets are embedded between the rotor slots to form an alternate pole structure. The invention improves the air gap flux density of the motor, effectively reduces the flux leakage, and simultaneously achieves the purposes of reducing the use amount of permanent magnets and enhancing the mechanical structure strength of the rotor.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic two-dimensional structure of a motor according to an embodiment of the present invention;
FIG. 2 is a schematic perspective view of a motor according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of Halbach structure arrangement of a motor according to a trial test example of the present invention
FIG. 4 is a cogging torque plot of a motor in accordance with an embodiment of the present invention;
FIG. 5 is a graph of output torque of a motor operating on an applied operating current according to an embodiment of the present invention;
FIG. 6 is a three-phase no-load back EMF diagram of a motor in accordance with an embodiment of the present invention;
fig. 7 is a three-phase no-load magnetic chain diagram of the motor of the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the present invention provides a novel double-stator Halbach alternating pole permanent magnet vernier motor, which includes a first stator structure 1, a second stator structure 3 and a rotor structure 2, wherein the rotor structure 2 is disposed between the first stator structure 1 and the second stator structure 3, and the distances from the first stator structure 1 to the second stator structure 3 are equal. The invention adopts a double-stator structure, can effectively utilize the magnetic field of the alternating pole permanent magnet, reduces magnetic leakage, improves torque, and can effectively offset unilateral axial force of a disc type motor.
As shown in fig. 2, the first stator structure 1 and the second stator structure 3 are stator structures with the same structure, and both include a stator core 11, the stator core 11 is circumferentially and uniformly provided with stator slots 12 and stator teeth 15 at intervals, armature windings 13 are embedded in the stator slots, the end portions of the stator teeth 15 are split into two modulation poles 16, and a Halbach permanent magnet array 14 is arranged between the modulation poles 16.
The rotor structure 2 includes a rotor core 21, rotor slots 22 are formed in the rotor core 21 at equal intervals in the circumferential direction, and rotor permanent magnets 23 are embedded between the rotor slots 22. The rotor teeth and the rotor permanent magnets 23 form an array of alternating pole structure, which can be regarded as the rotor teeth being magnetized into magnets of opposite polarity by the co-directional rotor permanent magnets 23.
The stator structure of the invention is matched with the alternate pole structure of the rotor, which is beneficial to enhancing the air gap flux density, improving the output torque, reducing the consumption of the permanent magnet and enhancing the mechanical structure strength of the rotor. Meanwhile, the invention adopts a disc type structure, provides a larger radiating surface, has better cooling effect and higher iron core utilization rate.
Further, as shown in fig. 3, the Halbach permanent magnet array 14 is a Halbach permanent magnet array, and is composed of a plurality of Halbach permanent magnet array units arranged in the circumferential direction, each Halbach permanent magnet array unit includes a stator axial permanent magnet and two stator circumferential permanent magnets, the stator axial permanent magnet is magnetized in the axial direction and is arranged between the two stator circumferential permanent magnets, and the stator circumferential permanent magnets are magnetized in the radial tangential direction.
Furthermore, the number of pole pairs of the Halbach permanent magnet array 14 is equal to the number of modulation poles 16, the rotor permanent magnets 23 are homopolar, and the pole arc coefficient is 1.2; the pole pair number of the Halbach permanent magnet, the pole pair number of the rotor permanent magnet 23 and the pole pair number of the armature winding 13 meet the vernier effect, the number of the modulation poles 16 and the pole pair number of the armature winding 13 meet the relationship that the pole pair number of the rotor permanent magnet 23 meets the following relationship:
Ps-Pw＝Pr(1)
where Ps is the number of modulation poles 16, Pw is the number of pole pairs of the armature winding 13, and Pr is the number of pole pairs of the rotor permanent magnet 23. In this example, Ps is 24, Pw is 2, and Pr is 22.
Further, the magnetization directions of the axial permanent magnets on the Halbach permanent magnet arrays 14 on the first stator structure 1 and the second stator structure 3 are the same, and the magnetization directions of the circumferential permanent magnets on the Halbach permanent magnet arrays 14 on the first stator structure 1 and the second stator structure 3 are opposite.
Further, the magnetization direction of the rotor permanent magnet 23 is the same as the magnetization direction of the axial permanent magnet on the Halbach permanent magnet array 14 on the stator structure.
Further, a shaft hole 24 is provided in the center of the rotor core 21, and a key groove is provided in the shaft hole 24.
Further, the stator core 11 and the rotor core 21 are made of high-permeability silicon steel.
Further, the stator axial permanent magnet, the stator circumferential permanent magnet and the rotor permanent magnet 23 are made of neodymium iron boron.
As shown in FIG. 4, the cogging torque amplitude of the permanent magnet motor of the invention fluctuates up and down at 0 N.M, the average value of the output torque is 135 N.M, the fluctuation value of the output torque is small, and the motor can run more stably.
As shown in fig. 5, the magnetic linkage and the back electromotive force waveform of the permanent magnet motor of the present invention have good sine degree, and the harmonic content of the motor operation is small.
As shown in fig. 6, the permanent magnet machine of the present invention can also be operated as a generator. As shown in fig. 7, when the external prime mover drives the rotor to rotate continuously, the change of the permanent magnetic flux linkage of the armature winding 13 will generate a sinusoidal three-phase induced electromotive force in the winding, and the three-phase induced electromotive force is connected to a load, so that an alternating current can be output, and the power generation operation of the motor can be realized.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.

Claims (8)

1. A novel double-stator Halbach alternating pole permanent magnet vernier motor is characterized by comprising a first stator structure, a second stator structure and a rotor structure, wherein the rotor structure is arranged between the first stator structure and the second stator structure, and the distances from the rotor structure to the first stator structure and the second stator structure are equal;
the first stator structure and the second stator structure are stator structures with the same structure and respectively comprise a stator core, stator slots and stator teeth are uniformly arranged at intervals in the circumferential direction of the stator core, armature windings are embedded in the stator slots, the end parts of the stator teeth are divided into two modulation poles, and Halbach permanent magnet arrays are arranged between the modulation poles;
the rotor structure comprises a rotor core, rotor slots are formed in the circumferential direction of the rotor core at equal intervals, and rotor permanent magnets are embedded between the rotor slots.
2. The electric machine of claim 1, wherein the Halbach permanent magnet array comprises a plurality of Halbach permanent magnets arranged circumferentially, the Halbach permanent magnet array comprising a stator axial permanent magnet magnetized in an axial direction and two stator circumferential permanent magnets arranged between the two stator circumferential permanent magnets, the stator circumferential permanent magnets magnetized in a radial tangential direction.
3. The electric machine of claim 1, wherein the number of pole pairs of the Halbach array of permanent magnets is equal to the number of modulated poles, the number of pole pairs of the armature winding, and the number of pole pairs of the rotor permanent magnets satisfy the relationship:
Ps-Pw=Pr (1)
wherein, Ps is the number of modulation poles, Pw is the pole pair number of the armature winding, and Pr is the pole pair number of the rotor permanent magnet.
4. The electric machine of claim 1, wherein the first stator structure has the same direction of magnetization as the axial permanent magnets on the Halbach permanent magnet array on the second stator structure, and wherein the first stator structure has the opposite direction of magnetization as the circumferential permanent magnets on the Halbach permanent magnet array on the second stator structure.
5. The electric machine of claim 1, wherein the rotor permanent magnet magnetization direction is the same as the axial permanent magnet magnetization direction on the Halbach permanent magnet array on the stator structure.
6. The electric machine of claim 1, wherein the rotor core is centrally provided with a shaft bore, the shaft bore having a keyway disposed therein.
7. The electric machine of claim 1 wherein the stator and rotor cores are made of high permeability silicon steel.
8. The electric machine of claim 1 wherein the stator axial permanent magnets, stator circumferential permanent magnets and rotor permanent magnet material are neodymium iron boron.
CN201911250622.9A 2019-12-09 2019-12-09 Novel double-stator Halbach alternating pole permanent magnet vernier motor Active CN110808673B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022134777A1 (en) * 2020-12-24 2022-06-30 浙江盘毂动力科技有限公司 Rotor and axial flux motor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104201848A (en) * 2014-07-04 2014-12-10 东南大学 Double-stator permanent-magnet vernier wind driven generator
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
CN109245471A (en) * 2018-11-06 2019-01-18 武汉理工大学 A kind of alternately polar permanent magnetic vernier motor
CN110460182A (en) * 2019-05-28 2019-11-15 东南大学 Modularization permanent-magnetism based on alternately pole is compound from speed-down servo motor
CN111064332A (en) * 2020-01-08 2020-04-24 武汉理工大学 Bilateral Halbach alternate pole type permanent magnet vernier motor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104201848A (en) * 2014-07-04 2014-12-10 东南大学 Double-stator permanent-magnet vernier wind driven generator
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
CN109245471A (en) * 2018-11-06 2019-01-18 武汉理工大学 A kind of alternately polar permanent magnetic vernier motor
CN110460182A (en) * 2019-05-28 2019-11-15 东南大学 Modularization permanent-magnetism based on alternately pole is compound from speed-down servo motor
CN111064332A (en) * 2020-01-08 2020-04-24 武汉理工大学 Bilateral Halbach alternate pole type permanent magnet vernier motor

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张洋，黄明明著: "《新型永磁游标电机设计与分析》", 31 October 2018, 黄河水利出版社 *
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022134777A1 (en) * 2020-12-24 2022-06-30 浙江盘毂动力科技有限公司 Rotor and axial flux motor

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