WO2023032406A1 - Machine tournante électrique - Google Patents

Machine tournante électrique Download PDF

Info

Publication number
WO2023032406A1
WO2023032406A1 PCT/JP2022/023595 JP2022023595W WO2023032406A1 WO 2023032406 A1 WO2023032406 A1 WO 2023032406A1 JP 2022023595 W JP2022023595 W JP 2022023595W WO 2023032406 A1 WO2023032406 A1 WO 2023032406A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
rotor
fixed
stator core
circumferential direction
Prior art date
Application number
PCT/JP2022/023595
Other languages
English (en)
Japanese (ja)
Inventor
真弘 北野
Original Assignee
日本電産株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電産株式会社 filed Critical 日本電産株式会社
Priority to CN202280015865.8A priority Critical patent/CN116868480A/zh
Publication of WO2023032406A1 publication Critical patent/WO2023032406A1/fr

Links

Images

Classifications

    • 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
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • 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
    • 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
    • H02K1/2706—Inner rotors
    • 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

Definitions

  • the present invention relates to a rotating electric machine that employs a structure in which a stator housed in a motor housing is fixed to the motor housing with fasteners such as bolts.
  • stator In a rotating electrical machine constructed by housing a rotatable rotor and a stator arranged on the outer periphery of the rotor in a motor housing, the stator is fixed to the motor housing.
  • Methods include a shrink fitting method, a bolt fastening method, or a combination of both methods.
  • a bolt fastening method is adopted as a method of fixing the stator to the motor housing, a plurality of fixing portions projecting radially outward are formed on the outer periphery of the stator, and the stator is inserted through each of the fixing portions. It is fixed to the motor housing by tightening fasteners such as bolts.
  • a stator core that constitutes a stator is formed into a cylindrical shape by laminating a plurality of ring-shaped electromagnetic steel sheets in the axial direction and connecting the plurality of electromagnetic steel sheets to each other by caulking or the like. defines the circumferential pitch between the connecting portion and the fixed portion by caulking or the like of the electromagnetic steel sheets forming the stator core in order to suppress the eddy current loss generated in the stator core.
  • the fixed portions are formed at a circumferential pitch equal to or a divisor of the circumferential pitch of the fastening portions with respect to the rotation center of the rotor.
  • the fixed portions are formed at a circumferential pitch corresponding to a divisor of the circumferential pitch of the fastening portion with respect to the rotor rotation center or a divisor of 180°.
  • Patent Document 2 in a rotating electric machine that adopts a shrink fitting method and a bolt fastening method as fixing methods of the stator, in order to increase the fastening force of the stator to the motor housing and to suppress deformation of the stator due to fastening, A configuration has been proposed in which a recess is formed at the base of the fixing portion (protruding portion) of the stator.
  • the present invention has been made in view of the above problems, and its object is to provide a rotating electric machine that can suppress torque ripple to a low level, thereby suppressing vibration and noise.
  • the present invention provides a rotatable rotor having a plurality of permanent magnets embedded in its outer peripheral portion, a stator fixed around the rotor and having a stator core provided with a plurality of coils, and A rotor and a motor housing that accommodates the stator therein are provided, and the stator is fixed to the motor housing by fasteners that are inserted through a plurality of fixing portions projecting radially outward from the outer peripheral edge of the stator core.
  • stator core on the q-axis other than the q-axis passing through the center of the fixed portion is axially provided with the q-axis of the rotor passing through the center of the fixed portion
  • a penetrating flux barrier is formed.
  • the magnetic path widens, reducing magnetic resistance and increasing torque.
  • a flux barrier is provided in the middle of the magnetic flux, the flux barrier narrows the magnetic path and increases the magnetic resistance. For this reason, the decrease in magnetic resistance caused by the magnetic flux flowing through the fixed part is offset by the increase in magnetic resistance due to the flux barrier, and the torque fluctuation of the rotor, that is, the torque ripple, is kept small, and the vibration and noise of the rotating electric machine are reduced. be kept low.
  • FIG. 1 is a vertical cross-sectional view of a rotary electric machine according to the present invention
  • FIG. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1
  • FIG. 3 is an enlarged detailed view of a B portion of FIG. 2
  • FIG. 3 is an enlarged detailed view of a C portion of FIG. 2
  • FIG. 2 is an upper half view of a rotor and a stator showing the magnetic flux generated in the stator core at a predetermined electrical angle, where (a) shows the magnetic flux of the rotating electrical machine according to the present invention and (b) shows the magnetic flux of the conventional rotating electrical machine. is.
  • FIG. 1 is a vertical cross-sectional view of a rotary electric machine according to the present invention
  • FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1
  • FIG. 3 is an enlarged detailed view of a B portion of FIG. 2
  • FIG. 3 is an enlarged detailed view of a C portion of FIG. 2
  • FIG. 2 is an upper half view of a rotor and a stator showing the magnetic flux generated in the stator core at a predetermined electrical angle, where (a) shows the magnetic flux of the rotating electrical machine according to the present invention and (b) shows the magnetic flux of the conventional rotating electrical machine.
  • FIG. 4 is a diagram showing a comparison of torque fluctuation with respect to electrical angle of a rotating electric machine according to the present invention with torque fluctuation of a conventional rotating electric machine;
  • FIG. 1 is a vertical cross-sectional view of a rotating electric machine according to an embodiment of the present invention
  • FIG. 2 is a cross-sectional view along line AA of FIG. 1
  • FIG. 3 is an enlarged detailed view of B part of FIG. 2, and
  • FIG. It is a partial enlarged detail view.
  • the rotary electric machine 1 is a three-phase synchronous motor generator, functions as an electric motor (motor) or a generator (generator), and can be used, for example, as an electric vehicle (EV vehicle) or a hybrid vehicle (HEV vehicle). It is used as a driving source such as As shown in FIG. 1 , the rotating electric machine 1 is constructed by housing a rotatable rotor 10 and a stator 20 fixed around the rotor 10 in a motor housing 30 .
  • the motor housing 30, the rotor 10, and the stator 20, which constitute the rotary electric machine 1, will be described below.
  • the motor housing 30 is constructed by covering the opening of a bottomed cylindrical main body 30A with one end face opened with a disc-shaped cover 30B, and is formed by die casting of aluminum, aluminum alloy, or the like, for example.
  • the rotor 10 includes a cylindrical rotor core 11, a round shaft (motor shaft) 12 passing through the center of the rotor core 11 in the axial direction (horizontal direction in FIG. Both ends of the shaft 12 in the axial direction are connected to bearings (ball bearings) 14 and 15 provided in the main body 30A and the cover 30B of the motor housing 30, respectively. is rotatably supported by Therefore, the rotor 10 is rotatable around the axis (rotational center) of the shaft 12 .
  • the rotor core 11 is formed in a columnar shape by laminating a plurality of plate-shaped thin electromagnetic steel sheets 11a such as iron or iron alloys.
  • the plurality of electromagnetic steel sheets 11a are integrated by being connected to each other by caulking, welding, or the like. It is fixed to the outer circumference of the shaft 12 by a technique such as fastening. Therefore, the rotor core 11 can rotate together with the shaft 12 .
  • the plurality of permanent magnets 13 are configured as rectangular plates elongated in the axial direction (perpendicular to the paper surface of FIG. 2). are arranged in a triangular shape, and a total of eight pairs of magnetic pole portions 40 are arranged at equal angular pitches (45° pitches) in the circumferential direction.
  • Cavities 16 each having a rectangular cross-section are provided axially (perpendicular to the paper surface of FIG. 2) through both longitudinal ends of each permanent magnet 13 of the rotor core 11 (see FIGS. 3 and 4).
  • the plurality (eight sets) of magnetic pole portions 40 are composed of N magnetic pole portions 40N and S magnetic pole portions 40S that are alternately arranged in the circumferential direction.
  • the two permanent magnets 13b and 13c, which are arranged obliquely along the radial direction, are arranged so that their north poles face the inner surfaces facing each other.
  • each S pole magnetic pole portion 40S as shown in FIG. 4, one of the three permanent magnets 13 (13a, 13b, 13c) arranged in a triangular shape is arranged along the circumferential direction.
  • the magnet 13a is arranged so that the S pole faces the outer peripheral side
  • the two permanent magnets 13b and 13c arranged obliquely along the radial direction are arranged so that the S pole faces the opposing inner surface side. ing.
  • the d (direct) axis shown in FIG. 2 is the magnetic pole center line indicating the main magnetic flux direction of each N pole magnetic pole portion 40N and each S pole magnetic pole portion 40S, and the q (quadrature) axis is the d axis.
  • the d-axis and the q-axis are magnetically orthogonal axes (axis between the N pole magnetic pole portion 40N and the S pole magnetic pole portion 40S), and in the rotating electric machine 1 according to the present embodiment, these d-axis and q-axis are in the circumferential direction. 8 are alternately arranged at an angular pitch of 22.5°.
  • the stator 20 includes a cylindrical stator core 21 and a plurality of coils 22, as shown in FIG.
  • the stator core 21 is configured in a columnar shape by laminating a plurality of plate-shaped thin electromagnetic steel sheets 21a such as iron or iron alloy.
  • the plurality of electromagnetic steel sheets 21a are integrated by being connected to each other by caulking, welding, or the like.
  • the stator core 21 has a ring-shaped yoke 21A and a plurality of (48 in the illustrated example) teeth 21B extending radially inward on the inner peripheral side of the yoke 21A.
  • a plurality of (48) teeth 21B are formed at an equal angular pitch (7.5° pitch) in the circumferential direction, and axially penetrating slots 21C are formed between adjacent teeth 21B. formed. Therefore, the same number (48) of slots 21C as the teeth 21B are formed in the stator core 21 at an equal angular pitch (7.5° pitch) in the circumferential direction. It takes the form of pole 48 slots.
  • coils 22 are provided around each tooth 21B, each coil 22 being formed by, for example, winding an insulating-coated conductive wire.
  • the plurality of coils 22 are composed of a U-phase coil, a V-phase coil, and a W-phase coil. is applied, an AC magnetic field is generated in each coil 22 in a direction penetrating through the U-phase coil, the V-phase coil, and the W-phase coil.
  • the stator 20 configured as described above is fixed to the motor housing 30 by four bolts (only one bolt is shown in FIG. 1) 23, which are fasteners, as shown in FIG.
  • four fixed portions 24 which form a substantially triangular shape when viewed in the axial direction are arranged on four orthogonal q-axes. It protrudes integrally toward the outside. That is, the four fixing portions 24 are integrally protruding from the outer peripheral portion of the stator core 21 at an equal angular pitch (90° pitch) in the circumferential direction, and each fixing portion 24 has a circular bolt insertion hole.
  • each fixed portion 24a are pierced in the axial direction (perpendicular to the paper surface of FIG. 2).
  • the top of the triangle forms a convex arc curved surface
  • the two oblique sides of the triangle form the ring-shaped stator core 21 (yoke). 21A), forming a concave curved surface that smoothly connects to the outer circumference.
  • the stator 20 includes a total of four bolts (one bolt in FIG. 1) that are respectively inserted into bolt insertion holes 24a provided through the four fixing portions 24 (see FIG. 2). (only shown) 23 is screwed into the main body 30A of the motor housing 30 to be fixed to the motor housing 30 .
  • Circular hole-shaped flux barriers 25 penetrating in the axial direction are formed in the stator cores 21 on four q-axes other than the first q-axis.
  • four fixed portions 24 are formed at an equal angular pitch (90° pitch) on the outer circumference of the stator core 21 on the q-axis perpendicular to each other.
  • the four flux barriers 25 are formed in the stator core 21 at equal angular pitches (90° pitches) in the circumferential direction.
  • the four fixed portions 24 are protruded on the outer circumference of the stator core 21 at equal angular pitches (90-degree pitches) in the circumferential direction, but the number of fixed portions 24 is arbitrary. However, if the number of fixing portions 24 is two, the mounting strength of the stator 20 to the motor housing 30 may be insufficient. Although the mounting strength to the stator core 21 can be increased, there is a problem that the shape of the stator core 21 becomes complicated and the manufacturing cost increases. Therefore, in this embodiment, the number of fixing portions 24 is set to four.
  • the shape of the flux barrier 25 is a circular hole, but it is not limited to this, and may be an elliptical hole shape or a polygonal hole shape. It can be set arbitrarily within the achievable range.
  • the electric rotating machine 1 mounted in an electric vehicle (EV vehicle), a hybrid vehicle (HEV vehicle), etc. (hereinafter simply referred to as “vehicle”) serves as an electric motor (motor) that drives wheels to rotate.
  • a DC current output from a DC power supply such as a battery (not shown) is converted into an AC current by an inverter (not shown).
  • this alternating current is supplied to each of the plurality of coils (U-phase, V-phase and W-phase coils) 22 provided in the stator 20 of the rotary electric machine 1, these coils 22 generate rotating magnetic fields.
  • the magnetic flux of each coil (U-phase, V-phase, and W-phase coils) 22 becomes a combined rotating magnetic flux. 10 rotates in synchronization with the rotating magnetic flux.
  • FIG. 5 and 6 are upper half views of the rotor and stator showing the magnetic flux generated in the stator core at a predetermined electrical angle, where (a) is the magnetic flux of the rotating electric machine according to the present invention, and (b) is the conventional rotating electric machine. and FIG. 7 is a diagram showing the torque fluctuation with respect to the electrical angle of the rotary electric machine according to the present invention in comparison with the torque fluctuation of the conventional rotary electric machine.
  • each N pole magnetic pole portion 40N provided on the rotor 10 is followed by each S pole magnetic pole portion.
  • the magnetic fluxes f1 and f2 entering 40S in opposite directions flow through the stator core 21. Since each fixed portion 24 is located at the position where the magnetic fluxes f1 and f2 diverge, these magnetic fluxes f1 and f2 are Not flowing. Moreover, since each flux barrier 25 is located at a position where the magnetic fluxes f1 and f2 diverge, the flux barriers 25 do not block the magnetic fluxes f1 and f2. Therefore, in the electrical angle range a shown in FIG.
  • the magnetic flux resistance is the same as the magnetic flux resistance in the conventional rotating electrical machine without the flux barrier 25 shown in FIG.
  • the torque waveforms in the predetermined electrical angle range a are the same between the rotating electrical machine 1 according to the present invention and the conventional rotating electrical machine.
  • 110 is a rotor
  • 111 is a rotor core
  • 140N is an N magnetic pole portion
  • 140S is an S magnetic pole portion
  • 120 is a stator
  • 121 is a stator core
  • 122 is a coil
  • 124 is the fixed part.
  • the flux barrier 25 is formed in the middle of the magnetic flux f1. Since the flux barrier 25 is provided, the flux barrier 25 narrows the magnetic path and increases the magnetic resistance. Therefore, the decrease in magnetic resistance caused by the flow of the magnetic flux f3 through the fixed portion 24 is offset by the increase in magnetic resistance due to the flux barrier 25, preventing the torque waveform from rising in the electrical angle range b in FIG.
  • the waveform has substantially the same shape over the entire electrical angle range, as indicated by the solid line in FIG.
  • the torque ripple indicates the amount of fluctuation in the output torque of the rotor 10 (shaft 12) as a percentage of the average torque.
  • the rotating electrical machine 1 mounted on the vehicle functions as a generator during deceleration due to regenerative braking of the vehicle. That is, when the rotor 10 is rotationally driven by the rotational power input to the shaft 12 of the rotary electric machine 1 from the wheel side, alternating current is applied to the coils 22 of the stator 20 by the rotating magnetic flux of the permanent magnets 13 embedded in the rotor 10 . Generates power generation. The alternating current generated by the power generation is converted into a direct current by a converter (not shown), and the direct current charges a battery (not shown).
  • the present invention is applied to a rotating electric machine mounted on an electric vehicle (EV vehicle) or a hybrid vehicle (HEV vehicle). It is also applicable to a rotating electrical machine with
  • the present invention is applied to a rotating electric machine (motor generator) that functions as both a motor and a generator. It is also applicable to electric machines in the same way.
  • stator core 1 rotating electrical machine 10 rotor 11 stator core 12 shaft 13 permanent magnet 20 stator 21 stator core 21A stator core yoke 21B stator core disk 21C stator core slot 22 coil 23 bolt (fastener) 24 Fixed portion 24a Bolt insertion hole (through hole) 25 flux barrier 30 motor housing 40 magnetic pole portion 40N N magnetic pole portion 40S S magnetic pole portion

Landscapes

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

Abstract

L'invention concerne une machine tournante électrique (1) comprenant : un rotor (10) rotatif ayant une pluralité d'aimants permanents (13) intégrés dans une partie circonférentielle externe de celui-ci; un stator (20) qui est fixé autour du rotor et qui est pourvu d'une pluralité de bobines (22) au niveau d'un noyau de stator (21); et un carter de moteur (30) destiné à loger le rotor (10) et le stator (20). Le stator (20) est fixé au carter de moteur (30) par des boulons (éléments de fixation) (23) insérés à travers une pluralité de parties fixes (24) faisant saillie radialement vers l'extérieur à partir du bord circonférentiel externe du noyau de stator (21). Dans un état où un axe q du rotor (10) passe par les centres des parties fixes (24), une barrière de flux (25) qui pénètre dans une direction axiale est formée dans le noyau de stator (21) sur un axe q autre que l'axe q passant par les centres des parties fixes (24).
PCT/JP2022/023595 2021-09-01 2022-06-13 Machine tournante électrique WO2023032406A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202280015865.8A CN116868480A (zh) 2021-09-01 2022-06-13 旋转电机

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-142395 2021-09-01
JP2021142395 2021-09-01

Publications (1)

Publication Number Publication Date
WO2023032406A1 true WO2023032406A1 (fr) 2023-03-09

Family

ID=85411170

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/023595 WO2023032406A1 (fr) 2021-09-01 2022-06-13 Machine tournante électrique

Country Status (2)

Country Link
CN (1) CN116868480A (fr)
WO (1) WO2023032406A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59178943A (ja) * 1983-03-29 1984-10-11 Matsushita Electric Ind Co Ltd ブラシレス電動機
JPH0583891A (ja) * 1991-09-18 1993-04-02 Sony Corp 鉄芯モータ
JP2013066341A (ja) * 2011-09-20 2013-04-11 Toshiba Mitsubishi-Electric Industrial System Corp 回転電機
JP2021023012A (ja) * 2019-07-26 2021-02-18 株式会社東芝 回転電機の固定子

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59178943A (ja) * 1983-03-29 1984-10-11 Matsushita Electric Ind Co Ltd ブラシレス電動機
JPH0583891A (ja) * 1991-09-18 1993-04-02 Sony Corp 鉄芯モータ
JP2013066341A (ja) * 2011-09-20 2013-04-11 Toshiba Mitsubishi-Electric Industrial System Corp 回転電機
JP2021023012A (ja) * 2019-07-26 2021-02-18 株式会社東芝 回転電機の固定子

Also Published As

Publication number Publication date
CN116868480A (zh) 2023-10-10

Similar Documents

Publication Publication Date Title
US6815858B2 (en) Permanent magnet rotating electric machine
JP3509508B2 (ja) 永久磁石式同期モータ
JP3746372B2 (ja) 永久磁石式回転電機及びそれを用いた電動車両
US10644550B2 (en) Rotor for rotating electric machine
CN103117604A (zh) 电动旋转机器
JP2008187804A (ja) 回転子およびこの回転子を備えた回転電機
JP5347588B2 (ja) 埋め込み磁石式モータ
JP2009219343A (ja) 回転電機、および回転電機の固定子コイル接続方法
US10958120B2 (en) Electric machine rotor for harmonic flux reduction
JP3523557B2 (ja) 永久磁石式回転電機及びそれを用いたハイブリット電気自動車
WO2015151344A1 (fr) Moteur sans balais à aimant permanent
WO2017038326A1 (fr) Rotor, machine électrique tournante équipée de celui-ci et procédé de fabrication de rotor
JP4881708B2 (ja) 車両用交流発電機及び回転電機
WO2023032406A1 (fr) Machine tournante électrique
WO2017073275A1 (fr) Rotor de type à aimant, machine électrique rotative à rotor de type à aimant, et automobile électrique à machine électrique rotative
WO2023032403A1 (fr) Machine dynamo-électrique
WO2023026637A1 (fr) Machine électrique tournante
WO2019044206A1 (fr) Machine dynamo-électrique
JP4211200B2 (ja) 磁石併用同期機
WO2019003559A1 (fr) Stator de machine dynamo-électrique, machine dynamo-électrique et procédé de fabrication de stator de machine dynamo-électrique
JP4459886B2 (ja) ステータおよびモータ
JP2007221854A (ja) ステータの固定構造および電動車両
JP2012016112A (ja) 車両用回転電機のエンドプレート
JP7455994B2 (ja) 回転電機
JP2011083114A (ja) 電動機

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22863994

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 202280015865.8

Country of ref document: CN