CN108667166B - Damping switch reluctance hub motor - Google Patents

Damping switch reluctance hub motor Download PDF

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Publication number
CN108667166B
CN108667166B CN201810305052.8A CN201810305052A CN108667166B CN 108667166 B CN108667166 B CN 108667166B CN 201810305052 A CN201810305052 A CN 201810305052A CN 108667166 B CN108667166 B CN 108667166B
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stator
rotor
shaped
axial
magnetic
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CN108667166A (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
    • 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
    • H02K1/141—Stator cores with salient poles consisting of C-shaped cores
    • 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
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • H02K1/148—Sectional cores
    • 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
    • H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
    • H02K1/246—Variable reluctance rotors

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

Abstract

The inventionDiscloses a vibration damping switch reluctance hub motor, wherein a stator consists of N uniformly distributed along the circumferential directionsEach C-shaped stator block has a C-shaped axial cross section, C-shaped openings facing outward, and N rotor forming units uniformly distributed along the circumferential direction of the center of all the C-shaped openingsrThe inner diameter and the outer diameter of each rotor block are respectively and correspondingly equal to the inner diameter and the outer diameter of the C-shaped opening, and axial air gaps are reserved between two end faces of each rotor block in the axial direction and two end faces of each rotor block in the axial direction of the C-shaped opening; each stator tooth of each C-shaped stator is wound with a winding; n is a radical ofrThe rotor blocks are fixedly connected to the same non-magnetic-conductive rotor fixing device, and the outer wall of the non-magnetic-conductive rotor fixing device is fixedly sleeved with the inner wall of the hub; radial force is not generated between the stator and the rotor, so that the deformation of the motor in the vertical direction is reduced, the vertical vibration of the hub is reduced, meanwhile, axial force is mutually offset, and the vibration noise of the motor during operation is reduced.

Description

Damping switch reluctance hub motor
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a switched reluctance hub motor.
Background
Compared with the traditional electric automobile, the hub motor is sealed in the hub to directly drive the wheel, so that a wheel-side transmission system and noise of the wheel-side transmission system are omitted, and the noise of the whole automobile is reduced by the hub motor. The biggest defect of using the switched reluctance motor as the hub motor is that the torque pulsation of the switched reluctance motor is large, and the vibration noise is larger than that of other motors, so that the application of the switched reluctance motor on the hub is restricted.
Chinese patent publication No. CN203896057U, entitled "a switched reluctance hub motor", discloses a multi-phase 12/16 switched reluctance motor, which has a small mechanical phase angle between phases, so that the switching between phases is smooth, and vibration and noise are reduced. Chinese patent publication No. CN206149116U entitled "electric vehicle, wheel, switched reluctance motor, and switched reluctance motor system", discloses a multiphase hub motor, in which terminals are provided at both ends and the middle part of the winding, so that multi-gear adjustment of output power can be realized, and reliability is high. The defects of the two patent publications are as follows: the complexity of the structure and control of the motor is increased while the torque ripple and the noise are reduced by increasing the number of phases of the switched reluctance motor, and the noise reduction effect is limited.
Chinese patent publication No. CN05356629A, entitled "a high fault-tolerant modular switched reluctance motor and its drive control system", discloses a modular switched reluctance motor, which is composed of a plurality of E-shaped stators uniformly distributed in the motor rotation circumferential direction and three rotors distributed axially, each phase circuit and magnetic circuit are isolated from each other, and the fault-tolerant performance is good. The Chinese patent publication No. CN101557153A entitled "E-shaped modular stator segmented rotor switched reluctance motor" discloses a switched reluctance motor composed of an E-shaped modular stator and a segmented rotor, the magnetic circuit is relatively independent, and the resistance is small when the switched reluctance motor runs at high speed. The defects of the above two patent applications are: the problem that the radial force of a common switched reluctance motor is large is not solved, so that the vibration reduction effect is not obvious.
Disclosure of Invention
The invention aims to solve the problems that magnetic fluxes at the air gaps of a stator and a rotor of an existing common switched reluctance motor are all along the radial direction of the motor, large radial force is generated, and vertical vibration of the motor is increased.
In order to achieve the purpose, the damping switch reluctance hub motor specifically adopts the following scheme: the middle of the stator is a non-magnetic stator fixing device, a stator is coaxially sleeved outside the non-magnetic stator fixing device, and the stator consists of N which is uniformly distributed along the circumferential directionsEach C-shaped stator block has a C-shaped axial cross section, C-shaped openings facing outward, and N rotor forming units uniformly distributed along the circumferential direction of the center of all the C-shaped openingsrEach rotor block has an inner diameter and an outer diameter corresponding to each otherThe axial air gaps are reserved between two end faces of the rotor block in the axial direction and two end faces of the C-shaped opening in the axial direction; the inner space of each C-shaped stator block forms a stator slot, two stator teeth are arranged on two axial sides of the stator slot, and a winding is wound on each stator tooth; n is a radical ofrThe rotors are fixedly connected with the same non-magnetic rotor fixing device in blocks, the outer wall of the non-magnetic rotor fixing device is fixedly sleeved with the inner wall of the hub, and the inner end of the non-magnetic rotor fixing device radially and inwards penetrates through NsA C-shaped opening enters the stator slot.
Further, NsAnd NrThe relationship satisfies: LCM (N)s,Nr)＝mNrLCM is the least common multiple, and the number of motor phases is m.
The invention adopts the technical scheme and has the beneficial effects that:
1. the motor magnetic loops are mainly distributed along the axial direction, no radial force is generated between the stator and the rotor, the deformation of the motor in the vertical direction is reduced, the vertical vibration of the hub is reduced, the riding comfort of a vehicle is improved, and meanwhile, the axial forces are mutually offset, 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 pole and does not pass through other stator poles, so that each magnetic circuit is independent and has no mutual inductance.
3. All parts of the invention have simple and compact structure, high fault tolerance and convenient maintenance.
4. The rotor block has small volume, and the internal space of the motor is saved.
Drawings
The invention is described in further detail below with reference to the drawings and the detailed description;
FIG. 1 is a perspective view of a stator and rotor structural arrangement in the present invention;
FIG. 2 is an axial cross-sectional view of the present invention;
FIG. 3 is a radial cross-sectional view of the present invention;
FIG. 4 is a block diagram of the C-shaped stator segment and windings of FIG. 2;
FIG. 5 is a diagram of the flux path of the motor in the maximum inductance position during operation of the present invention;
in the figure: 1. a stator: 1-1, C-shaped opening; 1-2, stator teeth; 1-3, a stator yoke; 1-4, a ladder key; 1-5, stator slots; 2. a rotor; 3. a winding; 4. a non-magnetically permeable stator fixture; 5. a non-magnetically conductive rotor fixture; 6. pressing a plate; 7. a hub.
Detailed Description
Referring to fig. 1, 2 and 3, the invention comprises a non-magnetically permeable stator fixture 4, a stator 1, a rotor 2 and windings 3. The middle of the stator is a non-magnetic stator fixing device 4, the stator 1 is coaxially sleeved outside the non-magnetic stator fixing device 4, and the inner wall of the stator 1 is fixedly connected with the outer wall of the non-magnetic stator fixing device 4. Stator 1 is composed of NsEach C-shaped stator is formed by blocks, NsThe C-shaped stator blocks are uniformly distributed along the circumferential direction outside the non-magnetic-conduction stator fixing device 4, and the included angle between two adjacent C-shaped stator blocks is 360/NsAnd (4) degree. The axial section of each C-shaped stator sub-block is C-shaped, and the C-shaped opening faces to the outer end. Each C-shaped stator sub-block is formed by laminating silicon steel sheets.
Referring to fig. 4, the widths of the portions of the C-shaped stator segment are all equal. The inner space of each C-shaped stator block forms a stator slot 1-5, two stator teeth 1-2 are arranged on two axial sides of the stator slot 1-5, and a winding 3 is wound on each stator tooth 1-2. The inner side of the stator slot 1-5 is provided with a stator yoke part 1-3, the stator yoke part 1-3 is not wound with a winding 3, and the outer side of the stator slot 1-5 is provided with a C-shaped opening 1-1. The inner wall of each stator yoke part 1-3 extends inwards in the radial direction to form a trapezoidal key 1-4, and the trapezoidal keys 1-4 are fixedly embedded in the outer wall of the non-magnetic-conductive stator fixing device 4, so that the stator 1 is fixed with the non-magnetic-conductive stator fixing device 4. During connection, N is processed on the non-magnetic-conductive stator fixing device 4sA trapezoidal groove, NsA trapezoidal key 1-4 and NsThe trapezoidal grooves are matched with each other to fix the stator 1 on the non-magnetic stator fixing device 4. The opening of the C-shaped block stator is right opposite to the radial outer end of the motor, the opening is a rotor rotation track space, and the C-shaped block stator is symmetrical along the axial central line of the stator.
Referring to fig. 2 and 3, along allN is uniformly distributed in the circumferential direction of the center of the C-shaped opening 1-1 of the C-shaped stator blockrEach rotor being divided into blocks, NrThe rotor segments together form the rotor 2. The included angle between two adjacent rotor blocks is 360/NrAnd (4) degree. The axial and radial cross-sections of each rotor segment are rectangular. The length of the rotor block in the axial direction is smaller than that of the C-shaped opening 1-1 in the axial direction, and an axial air gap is reserved between two end faces of the rotor block in the axial direction and two end faces of the C-shaped opening 1-1 in the axial direction, so that the rotor block and the C-shaped stator block do not interfere with each other. Each rotor block is formed by laminating silicon steel sheets.
The inner diameter and the outer diameter of each rotor block are respectively and correspondingly equal to the inner diameter and the outer diameter of the C-shaped opening 1-1, namely the outer diameter of each rotor block is equal to the outer diameter of the C-shaped opening 1-1 and the outer diameter of the stator 1, and the inner diameter of each rotor block is equal to the inner diameter of the C-shaped opening 1-1 and the outer diameter of the stator slot 1-5. When the rotor 2 rotates, the rotor 2 passes through the space of the C-shaped opening 1-1, and the C-shaped opening 1-1 becomes a partial rotation track space of the rotor 2.
NrThe rotor blocks are fixedly connected to a circular non-magnetic-conductive rotor fixing device 5 together, the outer wall of the non-magnetic-conductive rotor fixing device 5 is fixedly sleeved on the inner wall of a hub 7, the outer diameter of the non-magnetic-conductive rotor fixing device 5 is equal to the inner diameter of the hub 7 and is fixedly connected with the hub 7, and the hub 7 is driven to rotate coaxially. The inner end of the non-magnetic rotor fixing device 5 in the radial direction penetrates inwards through NsA C-shaped opening 1-1 of the C-shaped stator block enters into the NsThe inner diameter of the non-magnetic rotor fixture 5 in the stator slots 1-5 of the C-shaped stator segments is larger than the inner diameter of the stator slots 1-5 without interfering with the C-shaped stator segments. The non-magnetic rotor fixing device 5 is made of non-magnetic material, and N is processed on the non-magnetic materialrEach axial rectangular through hole is tightly and fixedly embedded with a rotor block for fixing the rotor 2. The two end faces of the rotor block in the axial direction are flush with the two end faces of the axial rectangular through hole in the axial direction.
When the rotor 2 rotates, the rotor 2 passes through the space of each C-shaped opening 1-1, and the C-shaped opening 1-1 becomes a partial rotation trajectory space of the rotor 2.
Number N of C-shaped stator segmentssAnd the number N of rotor blocksrThe relationship satisfies: LCM (N)s,Nr)＝mNrLCM is the least common multiple, and the number of motor phases is m.
The non-magnetic conductive stator fixing device 4 is a three-section stepped shaft, the outer diameter of the middle section shaft is larger than the outer diameters of the two end shafts, and the middle section shaft is a three-section stepped shaft with two thick sections and two thin sections. Upper processing N of middle section shaftsThe trapezoid-shaped groove is used for fixing the C-shaped stator blocks and realizing radial positioning of the stator 1, the size of the trapezoid-shaped groove is the same as that of the trapezoid-shaped key 1-4, and the axial length of the middle section shaft is the same as that of the C-shaped stator blocks. The two end shafts of the non-magnetic stator fixing device 4 have the same structure, and the pressing plates 6 are sleeved outside the two end shafts to realize the axial positioning of the stator 1.
The windings 3 on two radially opposite C-shaped stator segments form one phase, the windings 3 on two C-shaped stator segments of one phase are connected in parallel, and the winding arrangement form of each phase is the same. When the rotor is in work, the windings 3 on each phase of the C-shaped stator blocks of the motor are sequentially electrified, the rotor blocks are driven to rotate according to the minimum reluctance principle, the rotor blocks drive the non-magnetic-conduction rotor fixing devices 5 to rotate, and the non-magnetic-conduction rotor fixing devices 5 are tightly fixed with the hub 7, so that the hub 7 is directly driven to rotate.
When a phase winding 3 is excited, the magnetic circuit is shown as follows with reference to fig. 5: the rotor comprises 1-2 stator teeth on one axial side, an axial air gap on one axial side, a rotor 2, another axial air gap, 1-2 stator teeth on the other axial side and 1-2 stator teeth on one axial side.
The magnetic flux generated by electrifying the winding 3 is mainly distributed along the axial direction, and the radial force is not generated between the C-shaped stator block and the rotor block, so that the hub 7 of the electric vehicle tire does not generate deformation and vibration in the vertical direction, and the riding comfort of the vehicle is improved. Meanwhile, the axial forces are mutually offset, so that the deformation of the motor is small, and the vibration noise is reduced.
The difference with the magnetic circuit of the common switched reluctance motor is that the magnetic circuit shown in figure 5 of the invention only passes through the self-excited stator pole and does not pass through other stator poles, so that each magnetic circuit is independent and has no mutual inductance.

Claims (4)

1. The utility model provides a damping switch reluctance wheel hub motor, the centre is non-magnetic conduction stator fixing device (4), and non-magnetic conduction stator fixing device (4) outer coaxial cover has stator (1), characterized by: the stator (1) is composed of N uniformly distributed along the circumferential directionsEach C-shaped stator block is formed by C-shaped stator blocks, the axial section of each C-shaped stator block is C-shaped, the C-shaped openings (1-1) face the outer end, and N of the rotor (2) is uniformly distributed along the circumferential direction of the centers of all the C-shaped openings (1-1)rThe inner diameter and the outer diameter of each rotor block are respectively and correspondingly equal to the inner diameter and the outer diameter of the C-shaped opening (1-1), and an axial air gap is reserved between two end faces of each rotor block in the axial direction and two end faces of each C-shaped opening (1-4) in the axial direction; the inner space of each C-shaped stator block forms a stator slot (1-5), two stator teeth (1-2) are arranged on two axial sides of the stator slot (1-5), and a winding (3) is wound on each stator tooth (1-2); n is a radical ofrThe rotors are fixedly connected with the same non-magnetic rotor fixing device (5) in blocks, the outer wall of the non-magnetic rotor fixing device (5) is fixedly sleeved with the inner wall of the hub (7), and the inner end of the non-magnetic rotor fixing device penetrates through N in the radial directionsThe C-shaped openings (1-1) enter the stator slots (1-5); the magnetic flux generated by electrifying the winding (3) is distributed along the axial direction, and no radial force is generated between the C-shaped stator block and the rotor block; n is a radical ofsAnd NrThe relationship satisfies: LCM (N)s,Nr)＝mNrLCM is the minimum common multiple, and the number of motor phases is m; the inner wall of each stator yoke part (1-3) extends inwards in the radial direction to form a trapezoidal key (1-4), and the trapezoidal key (1-4) is fixedly embedded in the outer wall of the non-magnetic stator fixing device (4); the non-magnetic stator fixing device (4) is of a three-section stepped shaft structure with a thick middle part and two thin sections, the axial length of the middle section shaft is the same as that of the C-shaped stator block, the two sections of shafts are of the same structure, and a pressing plate (6) capable of being axially positioned is sleeved outside the two sections of shafts; the winding (3) on two radial opposite C shape stator blocks forms a phase, the winding (3) on two C shape stator blocks of a phase are connected in parallel, each phase winding (3) on the C shape stator block is electrified in turn, when a certain phase winding (3) is excited, the magnetic circuit is: stator teeth (1-2) on one axial side, axial air gap on one side, rotor (2), axial air gap on the other side and stator teeth (1) on the other axial side-2), one axial side stator tooth (1-2); the magnetic flux generated by electrifying the winding (3) is distributed along the axial direction, and radial force is not generated between the C-shaped stator block and the rotor block.
2. The vibration damping switched reluctance hub motor of claim 1, wherein: the inner diameter of the non-magnetic-conductive rotor fixing device (5) is larger than the inner diameter of the stator slots (1-5).
3. The vibration damping switched reluctance hub motor of claim 1, wherein: n is arranged on the non-magnetic-conduction rotor fixing device (5)rAnd two end faces of the rotor block in the axial direction are flush with two end faces of the axial rectangular through hole in the axial direction.
4. The vibration damping switched reluctance hub motor of claim 1, wherein: the axial and radial cross-sections of each rotor segment are rectangular.
CN201810305052.8A 2018-04-08 2018-04-08 Damping switch reluctance hub motor Active CN108667166B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116799980B (en) * 2023-06-26 2024-05-07 上海理工大学 Vibration reduction type stator modularized switch reluctance motor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102364845A (en) * 2011-10-17 2012-02-29 浙江亿恩机电科技有限公司 U-shaped switched reluctance motor
CN107846126A (en) * 2017-10-23 2018-03-27 史立伟 Electric automobile directly drives wheel hub motor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7459822B1 (en) * 2005-05-13 2008-12-02 Johnson Weston C Rotating electric machine having switched or variable reluctance with flux transverse to the axis of rotation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102364845A (en) * 2011-10-17 2012-02-29 浙江亿恩机电科技有限公司 U-shaped switched reluctance motor
CN107846126A (en) * 2017-10-23 2018-03-27 史立伟 Electric automobile directly drives wheel hub motor

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