CN113949244A - Single-tooth concentrated winding less-harmonic axial flux motor - Google Patents

Single-tooth concentrated winding less-harmonic axial flux motor Download PDF

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Publication number
CN113949244A
CN113949244A CN202111160514.XA CN202111160514A CN113949244A CN 113949244 A CN113949244 A CN 113949244A CN 202111160514 A CN202111160514 A CN 202111160514A CN 113949244 A CN113949244 A CN 113949244A
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China
Prior art keywords
stator
tooth
teeth
axial
permanent magnets
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CN202111160514.XA
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Chinese (zh)
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CN113949244B (en
Inventor
李烽
王凯
李新茂
高翔
朱姝姝
刘闯
高培伟
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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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
    • H02K16/02—Machines with one stator and two or more rotors
    • 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
    • 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
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/182—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to stators axially facing the rotor, i.e. with axial or conical air gap
    • 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
    • H02K1/2793—Rotors axially facing stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/12—Transversal flux machines
    • 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 single-tooth concentrated winding few-harmonic axial flux motor which comprises a middle stator and two disc rotors symmetrically arranged on two axial sides of the middle stator, wherein the two disc rotors have completely same structures, the two disc rotors are axially fixed and synchronously rotate through mechanical connection, independent air gaps are respectively formed between the two disc rotors and the middle stator, permanent magnets and salient pole rotor iron cores on the disc rotors are alternately arranged, slots are respectively formed on two axial sides of the middle stator to form stator teeth, the stator teeth on the two axial sides are connected through a yoke part of the middle stator, single-tooth concentrated armature windings with the span of 1 are respectively wound on the stator teeth on the two axial sides, and the two sets of the single-tooth concentrated armature windings are staggered by 1 tooth in the circumferential direction of the same-phase windings. The invention can eliminate counter potential even harmonic induced by the alternating pole permanent magnet rotor in the armature winding, improve the sine of counter potential waveform and improve the electromagnetic performance of the motor.

Description

Single-tooth concentrated winding less-harmonic axial flux motor
Technical Field
The invention belongs to the technical field of motors, and particularly relates to an axial magnetic motor.
Background
The axial flux permanent magnet motor has the advantages of high torque density, high power density, high efficiency and the like, and has very wide application prospects in the fields of new energy electric vehicles, wind power generation, marine propulsion, industrial production and the like. In order to save rare earth permanent magnet materials, the rare earth-less alternating pole permanent magnet motor is widely concerned. However, for an alternating-pole permanent magnet motor with odd unit motor stator teeth such as 9 slots and 10 poles, even harmonics in air gap magnetic density can cause counter potential even harmonics in a phase winding, and when three-phase alternating current is introduced into the motor, large odd-order torque pulsation can be generated to affect the electromagnetic torque quality of the motor.
Disclosure of Invention
In order to solve the technical problems mentioned in the background technology, the invention provides a single-tooth concentrated winding less-harmonic axial flux motor, which eliminates even harmonics in no-load back electromotive force, reduces torque pulsation and improves the quality of output electromagnetic torque.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
the utility model provides a few harmonic axial flux motor of single tooth concentrated winding, including middle stator, and two disc rotor that the symmetry set up in middle stator axial both sides, two disc rotor's structure is the same completely, two disc rotor are through mechanical connection axial fixity and synchronous revolution, form independent air gap between two disc rotor and the middle stator respectively, permanent magnet and salient pole rotor iron core alternate arrangement on the disc rotor, stator tooth is formed to the fluting respectively in the axial both sides of middle stator, the stator tooth of axial both sides is connected through the yoke portion of middle stator, the concentrated armature winding of single tooth that the span is 1 is wound respectively on the stator tooth of axial both sides, two sets of concentrated armature windings of single tooth belong to 1 tooth of the dislocation in the winding week of homophase.
Based on the preferred scheme of above-mentioned technical scheme, the stator tooth of middle stator axial both sides is axial tooth-tooth relative placement structure.
Based on above-mentioned technical scheme's preferred scheme, middle stator adopts high magnetic conduction SMC material or silicon steel sheet winding structure.
Based on the preferred scheme of above-mentioned technical scheme, the permanent magnet axial on two disk rotors is placed relatively, and the polar arc of all permanent magnets is equal, and the direction of magnetizing of all permanent magnets is unanimous, all points to middle stator side or deviates from middle stator side.
Based on the preferable scheme of the technical scheme, the permanent magnet adopts a partitioned Halbach magnetizing or sinusoidal magnetizing mode; the permanent magnet is made of neodymium iron boron material or ferrite material with high magnetic energy product.
Based on the preferable scheme of the technical scheme, the number of the stator tooth grooves on one axial side of the middle stator is 9n, wherein n is a positive integer greater than or equal to 1.
Based on the preferable scheme of the technical scheme, the number of the permanent magnets and the salient pole rotor cores on each disc rotor is the same and is 5n or 4 n.
Based on the preferable scheme of the technical scheme, when 4n permanent magnets are arranged on the disc rotor, the winding method of the coils on the stator teeth comprises the following steps:
a +, A-, A +, B-, B +, C-, and C + coils are respectively wound on the continuous 9 teeth on the stator tooth on one side, C-, A-, A +, A-, B-, B +, B-, C-, and C + coils are respectively wound on the corresponding 9 teeth on the stator tooth on the other side, and the rest teeth are repeatedly wound by taking 9 teeth as a unit according to the winding method.
Based on the preferable scheme of the technical scheme, when 5n permanent magnets are arranged on the disc rotor, the winding method of the coils on the stator teeth comprises the following steps:
a-, A +, A-, C-, B-and B-coils are respectively wound on the continuous 9 teeth on the stator tooth on one side, B +, A +, A-, A +, C +, C-, C +, B + coils are respectively wound on the corresponding 9 teeth on the stator tooth on the other side, and the rest teeth are repeatedly wound by taking 9 teeth as a unit according to the winding method.
Based on the preferred scheme of above-mentioned technical scheme, two sets of single tooth concentrated armature windings on the stator tooth of middle stator axial both sides end to end.
Adopt the beneficial effect that above-mentioned technical scheme brought:
1. armature winding coils on stator teeth on two sides of a stator are connected in a winding mode of staggering one tooth, so that the problem of counter electromotive force even harmonic caused by asymmetric air gap flux density of the alternating pole permanent magnet motor is solved, the waveform quality of the counter electromotive force of the motor is improved (namely, the waveform sine degree is improved), and the electromagnetic torque characteristic of the motor is further improved (namely, the electromagnetic torque pulsation of the motor is reduced);
2. two sets of armature windings on stator teeth on two sides of the stator are connected end to end, so that the effects of back emf fundamental wave superposition and even harmonic elimination can be realized, and the two sets of windings work simultaneously, so that the torque output capacity of the motor can be improved, and the quality of output torque can be improved;
3. the rotor side of the permanent magnet motor adopts a structure that the permanent magnets with high magnetic energy product and the salient pole iron cores are alternately arranged, so that the using amount of the permanent magnets can be saved and the cost of the motor can be reduced compared with the traditional permanent magnet motor;
4. the armature windings on the two sides of the stator are wound in a single-tooth concentrated mode, the processing complexity cannot be increased additionally, and the practicability is good.
Drawings
FIGS. 1-3 are schematic views of the motor construction of the present invention;
FIG. 4 is a schematic view of an alternate arrangement of rotors according to the present invention;
FIG. 5 is a top view of an alternate rotor configuration of the present invention;
fig. 6 is a schematic diagram of the winding of the armature winding according to the present invention.
Detailed Description
The technical scheme of the invention is explained in detail in the following with the accompanying drawings.
The invention designs a single-tooth concentrated winding less-harmonic axial flux motor, which comprises a middle stator 1 and disc rotors 2 and 3 positioned on two axial sides, wherein the disc rotors 2 and 3 are completely the same in structure, and the disc rotors 2 and 3 and the middle stator 1 form independent air gaps 4 and 5 respectively, as shown in figures 1-5. The disc rotors 2 and 3 are axially fixed and synchronously rotate through mechanical connection and are axially and symmetrically arranged, the permanent magnets 3-1 and the salient pole rotor cores 3-2 on the disc rotors form an alternately arranged rotor structure, and the rotor back yokes 3-3 provide paths for axial magnetic fluxes. Stator teeth 1-4 are formed by slotting on two axial sides of a middle stator 1, the stator teeth are connected through a yoke part 1-1 of the middle stator, single-tooth concentrated armature windings 1-2 and 1-3 with the span of 1 are wound on the stator teeth 1-4 on the two axial sides of the middle stator 1, the single-tooth concentrated armature windings 1-2 and 1-3 belong to windings with the same phase and are circumferentially shifted by 1 tooth, and elimination of no-load back electromotive force even harmonics is achieved. The invention can eliminate counter potential even harmonic induced by the alternating pole permanent magnet rotor in the armature winding, improve the sine of counter potential waveform and improve the electromagnetic performance of the motor.
In the present embodiment, it is preferable that the stator teeth on both sides in the axial direction of the middle stator 1 are in an axial tooth-tooth opposite placement structure. The middle stator 1 adopts a high-permeability SMC material or a silicon steel sheet winding structure.
In the present embodiment, preferably, as shown in fig. 4, the permanent magnets 3-1 on the two disk rotors 2 and 3 are axially opposite to each other, the pole arcs of all the permanent magnets 3-1 are equal, and the magnetizing directions of all the permanent magnets 3-1 are consistent and are all directed to or away from the middle stator side. The permanent magnet 3-1 adopts a partitioned Halbach magnetizing or sinusoidal magnetizing mode; the permanent magnet 3-1 is made of high magnetic energy product neodymium iron boron material or ferrite material.
In this embodiment, it is preferable that the number of stator slots on one axial side of the intermediate stator is 9n, and the number of permanent magnets and salient pole rotor cores on each disc rotor is the same, and is 5n or 4n, where n is a positive integer equal to or greater than 1.
Fig. 6 shows a labeled diagram of stator teeth on two axial sides of the stator of the invention, and the diagram is taken as an example to explain the armature coil winding method. When 9n stator teeth are arranged on one side of the motor and 4n permanent magnets are correspondingly arranged on a single disc, A +, A-, A +, B +, B-, B +, C +, C-and C + coils are respectively wound on the stator teeth 1-2-1 to 1-2-9. The back of the stator teeth 1-2-1 to 1-2-9 is opposite to the teeth 1-3-1 to 1-3-9, and the stator teeth 1-3-1 to 1-3-9 are respectively wound with coils C-, A-, A +, A-, B-, B +, B-, C-, C +. The motor adopts an 18-slot 16-pole structure and consists of two 9-slot 8-pole units, and the remaining 9 teeth on two sides of the stator are repeatedly wound according to an upper coil winding method.
When 9n stator teeth are arranged on one side of the motor and 5n permanent magnets are correspondingly arranged on the single disc, A-, A +, A-, C-, C +, C-, B-, B + and B-coils are respectively wound on the stator teeth 1-2-1 to 1-2-9. Opposite to the back of the stator teeth No. 1-2-1 to No. 1-2-9, teeth No. 1-3-1 to No. 1-3-9 are provided, and coils B +, A +, C +, B +, B-are respectively wound on the stator teeth No. 1-3-1 to 1-3-9. The motor adopts an 18-slot 20-pole structure and consists of two 9-slot 10-pole units, and the remaining 9 teeth on two sides of the stator are repeatedly wound according to an upper coil winding method.
The coils on the stator teeth on two sides of the stator of the motor are wound according to the mode to form an inner set of independent armature windings and an outer set of independent armature windings, and the inner set of armature windings and the outer set of armature windings are connected end to achieve the effects of back electromotive force fundamental wave superposition and even harmonic elimination. The two sets of windings work simultaneously, so that the torque output capacity of the motor can be improved, and the quality of output torque can be improved.
The embodiments are only for illustrating the technical idea of the present invention, and the technical idea of the present invention is not limited thereto, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the scope of the present invention.

Claims (10)

1. The utility model provides a few harmonic axial flux motor of single tooth concentrated winding which characterized in that: the two disc rotors are completely the same in structure, the two disc rotors are axially fixed and synchronously rotate through mechanical connection, independent air gaps are formed between the two disc rotors and the middle stator respectively, permanent magnets and salient pole rotor cores on the disc rotors are arranged alternately, stator teeth are formed by slotting on two axial sides of the middle stator respectively, the stator teeth on two axial sides are connected through a yoke part of the middle stator, single-tooth concentrated armature windings with the span of 1 are wound on the stator teeth on two axial sides respectively, and the two sets of the single-tooth concentrated armature windings belong to windings with the same phase and are staggered by 1 tooth in the circumferential direction.
2. The single tooth concentrated winding few harmonic axial flux machine of claim 1, further comprising: the stator teeth on the two axial sides of the middle stator are of an axial tooth-tooth opposite placement structure.
3. The single tooth concentrated winding few harmonic axial flux machine of claim 1, further comprising: the middle stator adopts a high-permeability SMC material or a silicon steel sheet winding structure.
4. The single tooth concentrated winding few harmonic axial flux machine of claim 1, further comprising: the permanent magnets on the two disc rotors are oppositely arranged in the axial direction, the pole arcs of all the permanent magnets are equal, the magnetizing directions of all the permanent magnets are consistent, and the permanent magnets point to the side of the middle stator or deviate from the side of the middle stator.
5. The single tooth concentrated winding few harmonic axial flux machine of claim 1, further comprising: the permanent magnet adopts a partitioned Halbach magnetizing or sinusoidal magnetizing mode; the permanent magnet is made of neodymium iron boron material or ferrite material with high magnetic energy product.
6. The single tooth concentrated winding few harmonic axial flux machine of claim 1, further comprising: the number of the stator tooth grooves on one axial side of the middle stator is 9n, wherein n is a positive integer greater than or equal to 1.
7. The single tooth concentrated winding few harmonic axial flux electric machine of claim 6, further comprising: the number of permanent magnets and salient pole rotor cores on each disc rotor is the same and is 5n or 4 n.
8. The single tooth concentrated winding few harmonic axial flux electric machine of claim 6, further comprising: when 4n permanent magnets are arranged on the disc rotor, the winding method of coils on the stator teeth is as follows:
a +, A-, A +, B-, B +, C-, and C + coils are respectively wound on the continuous 9 teeth on the stator tooth on one side, C-, A-, A +, A-, B-, B +, B-, C-, and C + coils are respectively wound on the corresponding 9 teeth on the stator tooth on the other side, and the rest teeth are repeatedly wound by taking 9 teeth as a unit according to the winding method.
9. The single tooth concentrated winding few harmonic axial flux electric machine of claim 7, further comprising: when 5n permanent magnets are arranged on the disc rotor, the winding method of coils on the stator teeth is as follows:
a-, A +, A-, C-, B-and B-coils are respectively wound on the continuous 9 teeth on the stator tooth on one side, B +, A +, A-, A +, C +, C-, C +, B + coils are respectively wound on the corresponding 9 teeth on the stator tooth on the other side, and the rest teeth are repeatedly wound by taking 9 teeth as a unit according to the winding method.
10. The single tooth concentrated winding few harmonic axial flux machine of claim 1, further comprising: two sets of single-tooth concentrated armature windings on the stator teeth on two axial sides of the middle stator are connected end to end.
CN202111160514.XA 2021-09-30 2021-09-30 Single-tooth concentrated winding few-harmonic axial flux motor Active CN113949244B (en)

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CN113949244B CN113949244B (en) 2023-03-14

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116154995A (en) * 2023-04-23 2023-05-23 中山大洋电机股份有限公司 Double-rotor single-stator alternating pole axial flux motor with fully-closed series magnetic circuit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050179336A1 (en) * 2003-11-17 2005-08-18 Masahiro Hasebe Axial gap electric rotary machine
CN101951047A (en) * 2010-08-31 2011-01-19 东南大学 Disk permanent magnet composite brushless motor
CN108390529A (en) * 2018-03-21 2018-08-10 哈尔滨工业大学 Double-stator permanent magnet synchronous motor
CN111082622A (en) * 2020-01-10 2020-04-28 南京航空航天大学 Decoupling type birotor alternating pole permanent magnet motor
CN112467950A (en) * 2020-11-19 2021-03-09 东南大学 Rotor permanent magnet type dual-rotor axial magnetic field hybrid excitation flux switching motor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050179336A1 (en) * 2003-11-17 2005-08-18 Masahiro Hasebe Axial gap electric rotary machine
CN101951047A (en) * 2010-08-31 2011-01-19 东南大学 Disk permanent magnet composite brushless motor
CN108390529A (en) * 2018-03-21 2018-08-10 哈尔滨工业大学 Double-stator permanent magnet synchronous motor
CN111082622A (en) * 2020-01-10 2020-04-28 南京航空航天大学 Decoupling type birotor alternating pole permanent magnet motor
CN112467950A (en) * 2020-11-19 2021-03-09 东南大学 Rotor permanent magnet type dual-rotor axial magnetic field hybrid excitation flux switching motor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116154995A (en) * 2023-04-23 2023-05-23 中山大洋电机股份有限公司 Double-rotor single-stator alternating pole axial flux motor with fully-closed series magnetic circuit
CN116154995B (en) * 2023-04-23 2023-07-11 中山大洋电机股份有限公司 Double-rotor single-stator alternating pole axial flux motor with fully-closed series magnetic circuit

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