CN113949186B - Few-harmonic alternating-pole hub motor - Google Patents
Few-harmonic alternating-pole hub motor Download PDFInfo
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- CN113949186B CN113949186B CN202111160516.9A CN202111160516A CN113949186B CN 113949186 B CN113949186 B CN 113949186B CN 202111160516 A CN202111160516 A CN 202111160516A CN 113949186 B CN113949186 B CN 113949186B
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- permanent magnets
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- 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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2786—Outer rotors
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- 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
- H02K1/165—Shape, form or location of the slots
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- 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
Abstract
The invention discloses a few-harmonic wave alternating pole hub motor which comprises an outer permanent magnet rotor and an inner stator, wherein an air gap is formed between the outer permanent magnet rotor and the inner stator, the outer permanent magnet rotor comprises a non-magnetic-conductive assembly and a magnetic-conductive assembly positioned on the inner side of the non-magnetic-conductive assembly, the non-magnetic-conductive assembly and the magnetic-conductive assembly are assembled together through a connecting piece structure, the outer permanent magnet rotor comprises a plurality of circumferentially magnetized permanent magnets and radially magnetized permanent magnets, the circumferentially magnetized permanent magnets are spoke permanent magnets, the radially magnetized permanent magnets are surface-mounted permanent magnets, the circumferentially magnetized permanent magnets and the radially magnetized permanent magnets are alternately arranged one by one, the inner stator comprises 3n stator modules, each stator module comprises 9 stator teeth, and three-phase armature windings are distributed on each stator module. The motor has a simple structure, not only has the magnetism gathering effect of the Spoke permanent magnet rotor structure, but also can eliminate even harmonics in counter electromotive force and improve the electromagnetic torque quality of the motor.
Description
Technical Field
The invention belongs to the field of hub motors, and particularly relates to a low-harmonic alternating-pole hub motor.
Background
The high magnetic energy permanent magnet material enables the motor to have the advantages of high torque density, high power density, high efficiency and the like. In recent years, with the price rise of rare earth materials, rare earth-less alternating pole permanent magnet motors are receiving wide attention. However, the alternating-pole rotor structure can cause air gap magnetic density even harmonic, and improper matching selection of the motor pole slots can induce counter electromotive force even harmonic in the armature winding, so that the output electromagnetic torque performance of the motor is deteriorated. In order to reduce the influence of the air gap magnetic density even harmonic of the alternating pole permanent magnet motor on the no-load back electromotive force waveform, the invention patent 'a winding dislocation hub motor stator and a winding dislocation hub motor device' (CN 108768016B) provides a winding dislocation method to weaken the even harmonic in the back electromotive force and improve the torque performance of the motor, however, the motor winding has a complex structure and is difficult to process, and the large-scale application of the motor winding in the industrial field is limited.
Disclosure of Invention
In order to solve the technical problems mentioned in the background technology, the invention provides a few-harmonic-wave alternating-pole hub motor, which solves the counter potential even harmonic problem caused by asymmetric air gap flux density of an alternating-pole permanent magnet motor and improves the electromagnetic torque characteristic of the motor.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
the few-harmonic alternating pole hub motor comprises an outer permanent magnet rotor and an inner stator, wherein an independent air gap is formed between the outer permanent magnet rotor and the inner stator, the outer permanent magnet rotor comprises a non-magnetic component located on the outermost side of the outer permanent magnet rotor and a magnetic component located on the inner side of the non-magnetic component, the non-magnetic component and the magnetic component are assembled together through a connecting piece structure, the outer permanent magnet rotor comprises a plurality of circumferentially magnetized permanent magnets and radially magnetized permanent magnets, the circumferentially magnetized permanent magnets are spoke permanent magnets and are arranged along the radial direction of the outer permanent magnet rotor, the radially magnetized permanent magnets are surface-mounted permanent magnets and are arranged along the inner edge of the magnetic component, the circumferentially magnetized permanent magnets and the radially magnetized permanent magnets are alternately arranged one by one, the inner stator consists of 3n stator modules, n is a positive integer, each stator module comprises 9 stator teeth, and a three-phase armature winding is distributed on each stator module.
Based on the preferable scheme of the technical scheme, the outer permanent magnet rotor comprises 10n permanent magnets which are magnetized in the circumferential direction and 10n permanent magnets which are magnetized in the radial direction.
Based on the preferred scheme of above-mentioned technical scheme, the direction of magnetizing between the permanent magnet that adjacent ring magnetizes is the opposite ring, and the direction of magnetizing of the permanent magnet that adjacent radial magnetization is opposite radially.
Based on the preferable scheme of the technical scheme, the magnetic conduction assembly is formed by laminating silicon steel sheets or three-dimensional identical SMC materials.
Based on the preferable scheme of the technical scheme, the non-magnetic conducting component is made of aluminum or stainless steel.
Based on the preferred scheme of above-mentioned technical scheme, the connecting piece structure is for seting up the dovetail on not leading magnetic component and seting up the dovetail on leading magnetic component, dovetail and dovetail adaptation.
Based on the preferable scheme of the technical scheme, the three-phase armature winding adopts a single-tooth centralized winding.
Based on the preferable scheme of the technical scheme, the winding method and the phase splitting method of the armature windings on the 3n stator modules are completely the same, and 9 stator teeth of each stator module sequentially wind A-, A +, A-, C-, C +, C-, B-, B + and B-coils along the counterclockwise direction.
Adopt the beneficial effect that above-mentioned technical scheme brought:
1. according to the invention, 3n 9-tooth unit motor element motors are adopted on the stator side, so that even harmonics in opposite potentials can be eliminated in a superposed manner, and the torque quality of the motor is improved;
2. the motor rotor adopts a structure that the spokes and the surface-mounted permanent magnets are alternately arranged, so that the consumption of the permanent magnets can be saved and the motor cost can be reduced compared with the traditional permanent magnet motor;
3. the rotor side of the invention can realize modularized processing and assembly, can simplify processing and assembly processes, improve working efficiency, save cost and have wide application prospect in the occasions of electric automobiles, marine propulsion, wind power generation and the like.
Drawings
FIG. 1 is a diagram of one embodiment of a low harmonic alternating pole hub motor designed in accordance with the present invention;
FIG. 2 is a waveform of no-load back emf of the stator modules and the entire motor of the motor of FIG. 1;
fig. 3 is a graph of the results of fourier analysis of the no-load back emf waveforms of the motor shown in fig. 1 and the entire motor.
Detailed Description
The technical scheme of the invention is explained in detail in the following with the accompanying drawings.
The invention designs a few-harmonic wave alternating pole hub motor, which comprises an inner stator 2 consisting of 3 9-tooth stator modules 2-1, 2-2 and 2-3 and an outer permanent magnet rotor 1,3 which are uniformly distributed in the circumferential direction of the 9-tooth stator modules as shown in figure 1. The outer permanent magnet rotor 1 comprises a non-magnetic component 1-1, a magnetic component 1-5, an annular magnetized permanent magnet 1-3 and a radial magnetized permanent magnet 1-4. The non-magnetic conductive component 1-1 and the magnetic conductive component 1-5 are fastened into a whole through a dovetail groove/dovetail tooth 1-2. An independent air gap 3 is formed between the inner stator 2 and the outer permanent magnet rotor 1. The circumferentially magnetized permanent magnets 1-3 are spoke permanent magnets and are arranged along the radial direction of the outer permanent magnet rotor, the radially magnetized permanent magnets 1-4 are surface-mounted permanent magnets and are arranged along the inner edge of the magnetic conduction assembly, and the circumferentially magnetized permanent magnets 1-3 and the radially magnetized permanent magnets 1-4 are alternately arranged one by one.
In the present embodiment, the outer permanent magnet rotor 1 preferably comprises 10 ring-magnetized permanent magnets 1-3 and 10 radial-magnetized permanent magnets 1-4. The magnetizing directions of the permanent magnets 1-3 magnetized in the circumferential direction are opposite in the circumferential direction, and the magnetizing directions of the permanent magnets 1-4 magnetized in the radial direction are opposite in the radial direction.
In this embodiment, the magnetic conductive assemblies 1-5 are preferably formed by laminating silicon steel sheets or by using three-dimensional identical SMC materials. The non-magnetic conducting component 1-1 is made of aluminum or stainless steel.
The winding connection of the motor is described below with reference to fig. 1: in the embodiment, a three-phase armature winding is taken as an example, the winding method and the phase splitting method of the armature winding on 3 stator modules are completely the same, and only the stator module 2-1 is taken as an example for explanation. The stator module 2-1 is defined as stator teeth 1 to 9 in the counterclockwise direction, and as shown in fig. 1, coils a-, a +, a-, C +, C-, B +, and B-are sequentially wound on the teeth 1 to 9. In fig. 1, the negative coil is defined as the current flowing out from the wire on the right side of the stator tooth, and the positive coil is defined as the current flowing into the wire on the right side of the stator tooth.
Fig. 2 shows the a-phase no-load back-emf waveforms of the stator modules 2-1, 2-2 and 2-3 and the resultant a-phase no-load back-emf waveforms of the three modules, and fig. 3 is the corresponding fourier analysis. Fig. 2 shows that the positive and negative of the A-phase no-load back electromotive force waveforms of the stator modules 2-1, 2-2 and 2-3 are asymmetric and seriously distorted, but the A-phase no-load back electromotive force waveforms are completely symmetric in positive and negative after the A-phase no-load back electromotive force waveforms are synthesized by the stator modules 2-1, 2-2 and 2-3. The Fourier analysis result of FIG. 3 shows that although the A-phase no-load back electromotive force waveforms of the stator modules 2-1, 2-2 and 2-3 contain a large amount of even harmonics, the A-phase no-load back electromotive force waveforms can completely eliminate the even harmonics after being synthesized, so that the waveform quality is improved, and the electromagnetic performance of the motor is improved.
The motor is simple in structure, has the magnetism gathering effect of a Spoke permanent magnet rotor structure, can eliminate even harmonics in counter electromotive force compared with a traditional alternating-pole motor structure, and can improve the quality of electromagnetic torque of the motor.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, for example, the alternating pole rotor may have various structures, and the radial magnetizing permanent magnet may have a tile shape, a V-shaped structure, a Halbach structure, etc., and the idea may also be extended to various motors, such as an axial magnetic flux and a linear motor, etc., and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the present invention.
Claims (6)
1. The utility model provides a few harmonic is utmost point wheel hub motor in turn which characterized in that: the outer permanent magnet rotor comprises a non-magnetic component positioned on the outermost side of the outer permanent magnet rotor and a magnetic component positioned on the inner side of the non-magnetic component, the non-magnetic component and the magnetic component are assembled together through a connecting piece structure, the outer permanent magnet rotor comprises a plurality of circumferentially magnetized permanent magnets and radially magnetized permanent magnets, the circumferentially magnetized permanent magnets are spoke permanent magnets and are arranged along the radial direction of the outer permanent magnet rotor, the radially magnetized permanent magnets are surface-mounted permanent magnets and are arranged along the inner edge of the magnetic component, the circumferentially magnetized permanent magnets and the radially magnetized permanent magnets are alternately arranged one by one, the inner stator consists of 3n stator modules, n is a positive integer, each stator module comprises 9 stator teeth, and three-phase armature windings are distributed on each stator module;
the winding method and the phase splitting method of the armature windings on the 3n stator modules are completely the same, and 9 stator teeth of each stator module sequentially wind A-, A +, A-, C-, C +, C-, B-, B +, B-coils along the counterclockwise direction;
the magnetizing directions of the adjacent permanent magnets which are magnetized in the circumferential direction are opposite in the circumferential direction, and the magnetizing directions of the adjacent permanent magnets which are magnetized in the radial direction are opposite in the radial direction;
the magnetizing directions of the two adjacent Spoke permanent magnets and the surface-mounted permanent magnet between the two Spoke permanent magnets are simultaneously directed to the rotor core or deviated from the rotor core.
2. The low harmonic alternating pole hub motor of claim 1, wherein: the outer permanent magnet rotor comprises 10n permanent magnets which are magnetized in the circumferential direction and 10n permanent magnets which are magnetized in the radial direction.
3. The low harmonic alternating pole hub motor of claim 1, wherein: the magnetic conduction assembly is formed by laminating silicon steel sheets or three-dimensional identical SMC materials.
4. The low harmonic alternating pole hub motor of claim 1, wherein: the non-magnetic conductive component is made of aluminum or stainless steel.
5. The low harmonic alternating pole hub motor of claim 1, wherein: the connecting piece structure is a dovetail tooth arranged on the non-magnetic conductive component and a dovetail groove arranged on the magnetic conductive component, and the dovetail tooth is matched with the dovetail groove.
6. The low harmonic alternating pole hub motor of claim 1, wherein: the three-phase armature winding adopts a single-tooth centralized winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111160516.9A CN113949186B (en) | 2021-09-30 | 2021-09-30 | Few-harmonic alternating-pole hub motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111160516.9A CN113949186B (en) | 2021-09-30 | 2021-09-30 | Few-harmonic alternating-pole hub motor |
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| CN113949186A CN113949186A (en) | 2022-01-18 |
| CN113949186B true CN113949186B (en) | 2023-03-14 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647422A (en) * | 2013-12-09 | 2014-03-19 | 江苏大学 | Series-connection hybrid magnetic material motor |
| CN106451859A (en) * | 2016-12-21 | 2017-02-22 | 北京理工大学 | Hybrid magnetic circuit rotor of permanent magnet synchronous motor |
| CN108565996A (en) * | 2018-05-02 | 2018-09-21 | 卧龙电气集团股份有限公司 | A kind of motor's for washing machine |
| CN108599418A (en) * | 2018-05-16 | 2018-09-28 | 华中科技大学 | A kind of rotor core and motor of magnetic circuit tandem type hybrid permanent magnet controllable flux motor |
| CN110212665A (en) * | 2019-05-08 | 2019-09-06 | 江苏大学 | A kind of method mixed rotor continuous pole permanent-magnet synchronous machine and reduce its torque pulsation |
| CN112583153A (en) * | 2019-09-30 | 2021-03-30 | 安徽威灵汽车部件有限公司 | Rotor of motor, driving motor and vehicle |
-
2021
- 2021-09-30 CN CN202111160516.9A patent/CN113949186B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647422A (en) * | 2013-12-09 | 2014-03-19 | 江苏大学 | Series-connection hybrid magnetic material motor |
| CN106451859A (en) * | 2016-12-21 | 2017-02-22 | 北京理工大学 | Hybrid magnetic circuit rotor of permanent magnet synchronous motor |
| CN108565996A (en) * | 2018-05-02 | 2018-09-21 | 卧龙电气集团股份有限公司 | A kind of motor's for washing machine |
| CN108599418A (en) * | 2018-05-16 | 2018-09-28 | 华中科技大学 | A kind of rotor core and motor of magnetic circuit tandem type hybrid permanent magnet controllable flux motor |
| CN110212665A (en) * | 2019-05-08 | 2019-09-06 | 江苏大学 | A kind of method mixed rotor continuous pole permanent-magnet synchronous machine and reduce its torque pulsation |
| CN112583153A (en) * | 2019-09-30 | 2021-03-30 | 安徽威灵汽车部件有限公司 | Rotor of motor, driving motor and vehicle |
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| CN113949186A (en) | 2022-01-18 |
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