CN108599493B - Axial magnetic flux hybrid excitation switched reluctance motor for pure electric vehicle - Google Patents

Axial magnetic flux hybrid excitation switched reluctance motor for pure electric vehicle Download PDF

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CN108599493B
CN108599493B CN201810376202.4A CN201810376202A CN108599493B CN 108599493 B CN108599493 B CN 108599493B CN 201810376202 A CN201810376202 A CN 201810376202A CN 108599493 B CN108599493 B CN 108599493B
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stator
axial
rotor
block
shaped
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CN108599493A (en
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孙晓东
刁凯凯
陈龙
周卫琪
杨泽斌
韩守义
李可
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Jiangsu University
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Jiangsu University
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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
    • H02K1/17—Stator cores with permanent magnets
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

The invention discloses an axial magnetic flux hybrid excitation switched reluctance motor for a pure electric vehicle, wherein two axial ends of a stator are respectively opposite to a rotor, and the stator is formed by N evenly distributed along the circumference and with an I-shaped axial sectionsThe stator comprises I-shaped stator blocks, wherein a stator yoke is arranged in the middle of each I-shaped stator block and is provided with two stator slots and 4 stator teeth in the axial direction, and a winding is wound on the stator yoke; a rectangular permanent magnet is fixedly embedded in each stator slot; each rotor is composed of N uniformly distributed along the circumferencerEach rotor is formed by blocks; the stator and the rotor do not generate radial force, the axial force is mutually counteracted, the vibration noise of the motor during operation is reduced, and each magnetic circuit is independent and has no mutual inductance; the permanent magnet is added to the stator part, so that the magnetic density of the motor during excitation is enhanced, the power density of the motor is improved, and the starting torque of the motor is increased.

Description

Axial magnetic flux hybrid excitation switched reluctance motor for pure electric vehicle
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a hybrid excitation switched reluctance motor for driving a pure electric vehicle.
Background
The traditional switched reluctance motor has large torque pulsation in the running process, generates large radial force when a phase winding is excited and electrified, and causes large deformation of a motor shell, thereby causing large vibration noise.
The switched reluctance motor disclosed in the document with the Chinese patent publication number of CN205509741U and the name of 'a cascade type axial excitation switched reluctance motor structure' adopts a cascade form and is excited axially by a U-shaped stator, so that the radial deformation of a shell is dispersed to a certain extent, the vibration is reduced, and the noise is reduced. The switched reluctance motor disclosed in the document with chinese patent publication No. CN204517610U and the name "a mixed excitation switched reluctance motor and its stator structure" has permanent magnets on the stator teeth, and an excitation winding is arranged between two adjacent stator teeth, so that the power density of the motor is improved. The two switched reluctance motors have the disadvantage that the problems of large torque pulsation and small starting torque of the switched reluctance motor are not solved at the same time.
Disclosure of Invention
The invention aims to solve the problems of large torque pulsation and small starting torque of the conventional switched reluctance motor, and provides an axial magnetic flux hybrid excitation switched reluctance motor which can improve the starting torque and reduce the torque pulsation and is suitable for a pure electric vehicle.
In order to achieve the purpose, the axial magnetic flux hybrid excitation switched reluctance motor for the pure electric vehicle specifically adopts the following scheme: the axial two ends of the stator are respectively opposite to a rotor, and the stator is formed by N which has an I-shaped axial section and is uniformly distributed along the circumferencesThe stator comprises I-shaped stator blocks, wherein a stator yoke is arranged in the middle of each I-shaped stator block and is provided with two stator slots and 4 stator teeth in the axial direction, and a winding is wound on the stator yoke; a rectangular permanent magnet is fixedly embedded in each stator slot; each rotor is composed of N uniformly distributed along the circumferencerEach rotor is formed by blocks.
NsNumber N of I-shaped stator blockssAnd the number N of rotor segmentsrSatisfies LCM (N)s,Nr)＝mNrLCM is the least common multiple, and the number of motor phases is m.
The inner diameter of the rotor block is equal to the inner diameters of the I-shaped stator block and the permanent magnet, the outer diameter of the rotor block is equal to the outer diameters of the I-shaped stator block and the permanent magnet, and the tangential lengths of the rotor block and the I-shaped stator block are equal.
The invention has the beneficial effects that:
1. the motor magnetic loop is axially distributed at the air gap, the stator and the rotor do not generate radial force, and the axial force is mutually counteracted, so that the deformation of the motor shell is small, and the vibration noise of the motor during operation is reduced.
2. The magnetic circuit of the motor only passes through the self-excited stator part and does not pass through other stator parts, so that each magnetic circuit is independent and has no mutual inductance.
3. The permanent magnet is added to the stator part, so that the magnetic density of the motor during excitation is enhanced, the power density of the motor is improved, the starting torque of the motor is increased, the defect of small starting torque of a common switched reluctance motor is overcome, and the permanent magnet motor is suitable for pure electric vehicles and enhances the running stability of the vehicles.
Drawings
FIG. 1 is an axial structural cross-sectional view of an axial flux hybrid excitation switched reluctance motor for a pure electric vehicle according to the present invention;
FIG. 2 is a perspective view of the stator and permanent magnets of FIG. 1;
FIG. 3 is a radial cross-sectional view of the stator, permanent magnets and stator frame of FIG. 1;
FIG. 4 is a radial cross-sectional view of the single rotor and rotor support of FIG. 1;
FIG. 5 is an enlarged elevational view of the single I-shaped stator segment and permanent magnet assembly of FIG. 2;
figure 6 is a schematic view of the flux path of the motor of the present invention shown in figure 1 in the maximum inductance position;
in the figure: 1. a stator: 1-1, stator teeth, 1-2 and a stator yoke; 1-3, stator slots; 2. a permanent magnet; 3. a rotor; 4. a winding; 5. a stator support; 6. a rotor support; 7. a bearing; 8. a rotating shaft.
Detailed Description
Referring to fig. 1, 2, 3 and 5, the present invention includes a stator 1, two ends of the stator 1 in the axial direction are respectively opposite to a rotor 3, and the present invention is a double-rotor structure motor. Axial air gaps are reserved between the two axial ends of the two rotors 3 and the two axial ends of the stator 1, and the two rotors 3 are connected with a rotating shaft 8 through corresponding rotor supports 6. The two rotors 3 are identical in structure and are axially symmetrical about the center of the stator 1.
Stator 1 is composed of NsEach I-shaped stator is formed by blocks, NsThe I-shaped stator blocks are uniformly distributed along the circumference, the axial section of each I-shaped stator block is of an I-shaped structure, and two adjacent N blockssThe block of the I-shaped statorThe included angle between the two is 360/NsAnd each I-shaped stator block is formed by laminating silicon steel sheets.
Referring to fig. 5, each i-shaped stator segment is axially and symmetrically arranged and has two openings facing the axial direction and 4 stator teeth 1-1, the two openings are opposite in direction and form two stator slots 1-3 opposite in direction. The middle of the I-shaped stator block is provided with a stator yoke 1-2, and the stator yoke 1-2 is arranged along the tangential direction of the circumference of the center point of the stator yoke. The stator yoke 1-2 is wound with windings 4.
A cuboid permanent magnet 2 is fixedly embedded in each stator slot 1-3, the permanent magnet 2 is fixedly connected to the part 1-1 of the stator tooth and is tightly contacted with the stator tooth 1-1 but not contacted with the stator slot 1-3, an axial distance is reserved between the permanent magnets, and the axial length of the permanent magnet 2 is determined by the space required by the winding 4. The permanent magnets 2 are all magnetized tangentially, and the magnetizing directions are the same.
NsThe I-shaped stator blocks are fixedly connected to a stator support 5, the stator support 5 is made of a non-magnetic material, and N is processed on the non-magnetic materialsAn axial through hole for fixing NsEach I-shaped stator segment, NsThe I-shaped stator sub-blocks are fixedly embedded in the corresponding axial through holes. The stator support 5 is sleeved on the outer ring of the bearing 7, the inner ring of the bearing 7 is fixedly sleeved outside the rotating shaft 8, and the stator support 5 is coaxially supported on the rotating shaft 8 through the bearing 7.
Referring to fig. 1 and 4, each rotor 3 is formed of NrEach rotor is formed by blocks, NrEach rotor block is uniformly distributed along the circumference, and two adjacent NrThe included angle between the rotor blocks is 360/NrDegree, NrEach rotor block is formed by laminating silicon steel sheets. N on rotor 3rThe rotor segments are fixed on a rotor support 6, the rotor support 6 is made of non-magnetic material, and N is processed on the non-magnetic materialrAn axial through hole for fixing NrEach rotor being divided into blocks, NrEach rotor block is embedded in corresponding NrIn each axial through hole, the rotor support 6 is coaxially and fixedly sleeved on the rotating shaft 8 and coaxially rotates with the rotating shaft 8.
NsNumber N of I-shaped stator blockssAnd the number N of rotor segmentsrSatisfies the following relationship: LCM (N)s,Nr)＝mNrLCM is the least common multiple, and the number of motor phases is m.
The inner diameter of the rotor block is equal to the inner diameters of the I-shaped stator block and the permanent magnet 2, and the outer diameter of the rotor block is equal to the outer diameters of the I-shaped stator block and the permanent magnet 2. The tangential lengths of the rotor blocks and the I-shaped stator blocks are equal, and the axial length of the rotor blocks is slightly greater than the tangential length of the stator teeth 1-1.
The axial length of the stator support 5 is the same as that of the I-shaped stator block, and the axial length of the rotor support 6 is the same as that of the rotor block.
Referring to fig. 5, 4 stator teeth 1-1 have no windings, and the windings 4 are wound on the stator yoke 1-2. The windings 4 on the two I-shaped stator blocks which are opposite in the radial direction form one phase of the motor, the windings 4 on the two stator yokes 1-2 of each phase are connected in parallel, and meanwhile, the arrangement form of the windings 4 of each phase is the same.
When the winding 4 is excited, the magnetic circuit is shown in figure 6, and the difference of the magnetic circuit of the motor of the invention from the magnetic circuit of the common switched reluctance motor is that the magnetic circuit only passes through the stator yoke 1-2 excited by the magnetic circuit per se and does not pass through other stator yokes 1-2, so that each magnetic circuit is independent and has no mutual inductance. Due to the adoption of a mixed excitation and double-rotor structure, a magnetic loop generated by excitation of the winding 4 on one stator yoke 1-2 can be divided into 4 loops, each loop is symmetrical about the axial central plane of the stator, and the paths of the loops A, B generated by excitation of the winding 4 are sequentially as follows: the stator comprises a stator yoke 1-2, stator teeth 1-1, an axial air gap, a rotor block, an axial air gap, stator teeth 1-1 on the same side and a stator yoke 1-2. The excitation loop C, D path generated by the permanent magnet 2 is in sequence: permanent magnet 2, stator tooth 1-1, axial air gap, rotor piecemeal, axial air gap, homonymy stator tooth 1-1, permanent magnet 2.
The magnetic flux generated by electrifying the winding 4 and the magnetic flux of the permanent magnet 2 at the axial air gap are distributed along the axial direction, and radial force is not generated between the I-shaped stator block and the rotor block, so that the deformation of the motor at each position is small, and the vibration noise is reduced. Meanwhile, the magnetic flux generated by the permanent magnet 2 enhances the magnetic density, and the output torque of the motor is improved.
When the invention works, each phase winding 4 of the motor is sequentially electrified, the block rotor 3 is driven to rotate according to the minimum magnetic resistance principle, the rotor 3 drives the rotor bracket 6 to rotate, and the rotor bracket 6 is tightly fixed with the rotating shaft 8, so that the rotating shaft 8 is driven to rotate.

Claims (7)

1. The utility model provides an axial magnetic flux hybrid excitation switched reluctance motor for pure electric vehicles, the axial both ends of stator (1) respectively just to a rotor (3), characterized by: the stator (1) is composed of N which has an I-shaped axial section and is uniformly distributed along the circumferencesThe stator comprises I-shaped stator blocks, wherein a stator yoke (1-2) is arranged in the middle of each I-shaped stator block and is provided with two axial stator slots (1-3) and 4 stator teeth (1-1), a winding (4) is wound on each stator yoke (1-2), each I-shaped stator block is symmetrically arranged in the axial direction, and the stator yokes (1-2) are arranged along the tangential direction of the circumference where the center points of the stator yokes are located; a cuboid permanent magnet (2) is fixedly embedded in each stator slot (1-3); each rotor (3) is formed by N evenly distributed along the circumferencerEach rotor is formed by blocks; the windings (4) on the two I-shaped stator blocks which are opposite in the radial direction form one phase, and the windings (4) on the two stator yokes (1-2) of each phase are connected in parallel; when the winding (4) is excited, the magnetic circuit only passes through the stator yoke (1-2) excited by the winding (4) on one stator yoke (1-2), the magnetic circuit generated by the excitation of the winding (4) on the other stator yoke (1-2) is divided into 4 circuits, each circuit is symmetrical about the axial central plane of the stator, the magnetic flux generated by electrifying the winding (4) and the magnetic flux of the permanent magnet (2) at the axial air gap are distributed along the axial direction, and no radial force is generated between the I-shaped stator block and the rotor block.
2. The axial flux hybrid excitation switched reluctance motor for the pure electric vehicle as claimed in claim 1, wherein: n is a radical ofsNumber N of I-shaped stator blockssAnd the number N of rotor segmentsrSatisfies LCM (N)s,Nr)＝mNrLCM is the least common multiple, and the number of motor phases is m.
3. The axial flux hybrid excitation switched reluctance motor for the pure electric vehicle as claimed in claim 1, wherein: the permanent magnet (2) is in close contact with the stator teeth (1-1) and is not in contact with the stator slots (1-3).
4. The axial flux hybrid excitation switched reluctance motor for the pure electric vehicle as claimed in claim 1, wherein: n is a radical ofrEach rotor block is fixedly embedded in a corresponding axial through hole in the same rotor support (6), and the rotor supports (6) are coaxially and fixedly sleeved on the rotating shaft (8).
5. The axial flux hybrid excitation switched reluctance motor for the pure electric vehicle as claimed in claim 1, wherein: n is a radical ofsThe I-shaped stator sub-blocks are fixedly embedded in corresponding axial through holes of the same stator support (5), and the stator support (5) is supported on the rotating shaft (8) through a bearing (7).
6. The axial flux hybrid excitation switched reluctance motor for the pure electric vehicle as claimed in claim 1, wherein: the inner diameter of the rotor block is equal to the inner diameters of the I-shaped stator block and the permanent magnet (2), the outer diameter of the rotor block is equal to the outer diameters of the I-shaped stator block and the permanent magnet (2), and the tangential lengths of the rotor block and the I-shaped stator block are equal.
7. The axial flux hybrid excitation switched reluctance motor for the pure electric vehicle as claimed in claim 1, wherein: the axial length of the stator support (5) is the same as that of the I-shaped stator block, and the axial length of the rotor support (6) is the same as that of the rotor block.
CN201810376202.4A 2018-04-25 2018-04-25 Axial magnetic flux hybrid excitation switched reluctance motor for pure electric vehicle Active CN108599493B (en)

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CN108599493B true CN108599493B (en) 2020-03-31

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108649760A (en) * 2018-05-07 2018-10-12 南京理工大学 A kind of two-rotor axial magnetic flux partitioned organization switched reluctance machines
CN112564442A (en) * 2020-12-01 2021-03-26 东南大学 Axial magnetic field birotor permanent magnet vernier motor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001327138A (en) * 2000-05-12 2001-11-22 Nippon Riken Kk Motor utilizing converging phenomenon of magnetic flux
CN105245071A (en) * 2015-10-30 2016-01-13 赵明珍 Energy-saving permanent magnetism switched reluctance motor
CN105827027A (en) * 2016-01-07 2016-08-03 安泰科技股份有限公司 Axial air gap switch reluctance motor and preparation method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001327138A (en) * 2000-05-12 2001-11-22 Nippon Riken Kk Motor utilizing converging phenomenon of magnetic flux
CN105245071A (en) * 2015-10-30 2016-01-13 赵明珍 Energy-saving permanent magnetism switched reluctance motor
CN105827027A (en) * 2016-01-07 2016-08-03 安泰科技股份有限公司 Axial air gap switch reluctance motor and preparation method thereof

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