MX9606093A - Seccion de conductor para una estructura de estator de una maquina dinamoelectrica polifasica. - Google Patents

Seccion de conductor para una estructura de estator de una maquina dinamoelectrica polifasica.

Info

Publication number
MX9606093A
MX9606093A MX9606093A MX9606093A MX9606093A MX 9606093 A MX9606093 A MX 9606093A MX 9606093 A MX9606093 A MX 9606093A MX 9606093 A MX9606093 A MX 9606093A MX 9606093 A MX9606093 A MX 9606093A
Authority
MX
Mexico
Prior art keywords
plane
stator core
conductor section
conductor
section
Prior art date
Application number
MX9606093A
Other languages
English (en)
Other versions
MXPA96006093A (es
Inventor
Pierre Couture
Bruno Francoeur
Andre Langlois
Jacques Leduc
Stephane Rieher
Jan Svobada
Original Assignee
Hydro Quebec
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 Hydro Quebec filed Critical Hydro Quebec
Publication of MXPA96006093A publication Critical patent/MXPA96006093A/es
Publication of MX9606093A publication Critical patent/MX9606093A/es

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/06—Embedding prefabricated windings in machines
    • H02K15/062—Windings in slots; salient pole windings
    • H02K15/065—Windings consisting of complete sections, e.g. coils, waves
    • H02K15/066—Windings consisting of complete sections, e.g. coils, waves inserted perpendicularly to the axis of the slots or inter-polar channels
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5313—Means to assemble electrical device
    • Y10T29/53143—Motor or generator

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Windings For Motors And Generators (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Linear Motors (AREA)

Abstract

Una seccion de conductor para un nucleo de estator de una máquina-eléctrica polifásica. El nucleo de estator está provisto con una serie de ranuras paralelas alargadas para recibir secciones de conductor respectivas. La seccion de conductor incluye dos lados paralelos (6, 8) que tienen una seccion transversal rectangular y están diseñados para embragar las ranuras paralelas correspondientes en el nucleo de estator de tal manera que los dos lados definan un plano. Dicha seccion de conductor incluye además al menos una cabeza de conductor (10) que tiene una seccion transversal rectangular y enlaza dos extremos adyacentes de los dos lados paralelos. La cabeza tiene un cuerpo en forma de U cuando se observa por encima de manera perpendicular al plano, y un cuerpo sinuoso cuando se observa en la vista frontal a lo largo de dicho plano. La cabeza tiene superficies opuestas, superior e inferior. La superficie superior encara un lado del plano mientras que la superficie inferior encara el lado opuesto del plano. La seccion de conductor permite ventajosamente la eficiencia de un motor para incrementarse ya que el factor de espacio de ranura de estator es elevado, mientras que al mismo tiempo permite que las secciones tengan pequeñas cabezas, reduciendo mediante esto el peso del motor y la pérdida de calor.
MX9606093A 1994-06-23 1995-05-12 Seccion de conductor para una estructura de estator de una maquina dinamoelectrica polifasica. MX9606093A (es)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08264504 1994-06-23
US08/264,504 US5714824A (en) 1994-06-23 1994-06-23 Conductor section for a stator frame of a polyphase dynamoelectric machine
PCT/CA1995/000284 WO1996000460A1 (fr) 1994-06-23 1995-05-12 Section de conducteur pour une armature de stator d'une machine dynamoelectrique polyphasee

Publications (2)

Publication Number Publication Date
MXPA96006093A MXPA96006093A (es) 1998-02-01
MX9606093A true MX9606093A (es) 1998-02-28

Family

ID=23006343

Family Applications (1)

Application Number Title Priority Date Filing Date
MX9606093A MX9606093A (es) 1994-06-23 1995-05-12 Seccion de conductor para una estructura de estator de una maquina dinamoelectrica polifasica.

Country Status (13)

Country Link
US (2) US5714824A (es)
EP (1) EP0766882B1 (es)
JP (1) JP3756516B2 (es)
KR (1) KR100305303B1 (es)
CN (1) CN1079177C (es)
AT (1) ATE171018T1 (es)
AU (1) AU2404295A (es)
BR (1) BR9507850A (es)
CA (1) CA2186640C (es)
DE (1) DE69504674T2 (es)
MX (1) MX9606093A (es)
TW (1) TW273057B (es)
WO (1) WO1996000460A1 (es)

Families Citing this family (78)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3080836B2 (ja) * 1994-04-11 2000-08-28 株式会社東芝 回転電機の固定子巻線分解組立装置
US5946793A (en) * 1995-10-10 1999-09-07 Kabushiki Kaisha Toshiba Method for assembling and disassembling stator winding of dynamo-electric machine
JPH1066314A (ja) * 1996-08-14 1998-03-06 Toyota Motor Corp モータのステータ作製方法
EP0881744B1 (en) * 1997-05-26 2005-07-20 Denso Corporation Alternator for vehicle
EP1179881B1 (en) * 1997-05-26 2004-09-22 Denso Corporation AC generator for vehicles
JP3407643B2 (ja) * 1997-05-26 2003-05-19 株式会社デンソー 車両用交流発電機
US6137201A (en) 1997-05-26 2000-10-24 Denso Corporation AC generator for vehicles
US6181043B1 (en) 1997-12-10 2001-01-30 Denso Corporation Alternator for vehicle
RU2145142C1 (ru) * 1998-01-30 2000-01-27 Открытое акционерное общество Нефтяная компания "Лукойл" Электродвигатель погружного насоса
JP3285534B2 (ja) * 1998-04-08 2002-05-27 三菱電機株式会社 車両用交流発電機の固定子
JP3384337B2 (ja) * 1998-09-07 2003-03-10 株式会社デンソー 車両用交流発電機の固定子
JP3419721B2 (ja) * 1999-12-06 2003-06-23 三菱電機株式会社 車両用交流発電機
JP3347115B2 (ja) * 1999-12-20 2002-11-20 三菱電機株式会社 交流発電機
JP3448253B2 (ja) * 2000-01-31 2003-09-22 三菱電機株式会社 交流発電機
JP2001231203A (ja) * 2000-02-10 2001-08-24 Mitsubishi Electric Corp 車両用交流発電機
JP3593009B2 (ja) * 2000-07-27 2004-11-24 三菱電機株式会社 回転電機
EP1548914A3 (en) * 2000-11-06 2010-08-25 Denso Corporation Stator arrangement of rotary electric machine
JP3752431B2 (ja) 2001-02-28 2006-03-08 株式会社日立製作所 回転電機及びその製造方法
JP3566665B2 (ja) * 2001-04-06 2004-09-15 三菱電機株式会社 回転電機の固定子
US7170211B2 (en) * 2002-01-24 2007-01-30 Visteon Global Technologies, Inc. Stator winding having transitions
US6882077B2 (en) * 2002-12-19 2005-04-19 Visteon Global Technologies, Inc. Stator winding having cascaded end loops
US6750581B2 (en) * 2002-01-24 2004-06-15 Visteon Global Technologies, Inc. Automotive alternator stator assembly with rectangular continuous wire
US7129612B2 (en) * 2002-01-24 2006-10-31 Visteon Global Technologies, Inc. Stator assembly with cascaded winding and method of making same
US6806611B2 (en) * 2002-02-13 2004-10-19 Honeywell International, Inc. Stator assembly for electrical machines and method of making the same
GB0206645D0 (en) * 2002-03-21 2002-05-01 Rolls Royce Plc Improvements in or relating to magnetic coils for electrical machines
DE10215937A1 (de) * 2002-04-11 2003-10-23 Alstom Switzerland Ltd Wicklung für eine dynamoelektrische Maschine
US6949857B2 (en) 2003-03-14 2005-09-27 Visteon Global Technologies, Inc. Stator of a rotary electric machine having stacked core teeth
CA2539790C (en) * 2003-09-22 2013-06-25 Litens Automotive Partnership Crankshaft torque modulator
US7049725B2 (en) * 2003-11-24 2006-05-23 Tm4 Inc. Dynamoelectric machine stator and method for mounting prewound coils thereunto
US7081697B2 (en) * 2004-06-16 2006-07-25 Visteon Global Technologies, Inc. Dynamoelectric machine stator core with mini caps
US7386931B2 (en) * 2004-07-21 2008-06-17 Visteon Global Technologies, Inc. Method of forming cascaded stator winding
US7269888B2 (en) 2004-08-10 2007-09-18 Visteon Global Technologies, Inc. Method of making cascaded multilayer stator winding with interleaved transitions
DE102005003057A1 (de) 2005-01-22 2006-07-27 Henkel Kgaa Spritzbare, niedrigviskose Kautschuk-Dämpfungsmassen
US7155319B2 (en) * 2005-02-23 2006-12-26 Applied Materials, Inc. Closed loop control on liquid delivery system ECP slim cell
CA2605822C (en) * 2005-04-26 2014-09-09 Tm4 Inc. Rectangular wire coil head shaping machine and method therefor
JP4813171B2 (ja) * 2005-12-16 2011-11-09 株式会社豊田自動織機 ステータの製造方法及び製造装置
JP4813172B2 (ja) * 2005-12-16 2011-11-09 株式会社豊田自動織機 ステータの製造方法及び製造装置
FR2896351B1 (fr) * 2006-01-16 2008-04-18 Valeo Equip Electr Moteur Procede pour realiser un stator de machine electrique tournante et agencement de conducteurs sur un support
WO2008020471A1 (fr) * 2006-08-15 2008-02-21 Hitachi, Ltd. Machine électrique rotative
JP4234749B2 (ja) * 2006-10-19 2009-03-04 株式会社日立製作所 回転電機、クランク形状の連続巻きコイル、分布巻き固定子及びそれらの形成方法
JP4735529B2 (ja) * 2006-12-21 2011-07-27 トヨタ自動車株式会社 モータの固定子
JP5040303B2 (ja) * 2006-12-28 2012-10-03 株式会社日立製作所 回転電機
US8878413B2 (en) * 2006-12-29 2014-11-04 Robert Bosch Gmbh Alternating-current generator having a stator and a stator winding made of winding elements inserted in stator slots and a method for producing a stator of the present invention
KR100806644B1 (ko) * 2006-12-30 2008-02-26 (주)월스타 진공청소기의 흡입력을 조절할 수 있는 진드기 흡입장치
CN101515733B (zh) * 2008-02-18 2012-11-21 株式会社日立制作所 旋转电机、连续绕组线圈、分布绕组定子及其形成方法
DK2166644T3 (da) * 2008-09-18 2019-05-06 Siemens Ag Gruppe af tre statorviklinger til en stator af en elektrisk maskine, statoranordning, generator og vindmølle
ES2399454T3 (es) * 2008-09-18 2013-04-01 Siemens Aktiengesellschaft Grupo de tres devanados de estator para un estator de una máquina eléctrica, disposición de estator, generador y turbina eólica
WO2011069243A1 (en) * 2009-12-11 2011-06-16 Tm4 Inc. Rectangular wire coil provided with a shaped head portion and stator made with such coils
US8427024B2 (en) 2009-12-18 2013-04-23 Toyota Jidosha Kabushiki Kaisha Stator
JP5493906B2 (ja) * 2010-01-21 2014-05-14 株式会社デンソー 回転電機の固定子
JP5704394B2 (ja) * 2010-03-31 2015-04-22 株式会社デンソー 回転電機の固定子
US20110266912A1 (en) * 2010-04-30 2011-11-03 Alstom Hydro France Rotating electric machine with a stator winding comprising a plurality of coils and method for manufacturing same
EP2418758A4 (en) 2010-06-11 2017-03-15 Toyota Jidosha Kabushiki Kaisha Stator and method for manufacturing unit coil used for same
US8841811B2 (en) * 2010-08-18 2014-09-23 Remy Technologies Llc Conductor insulation arrangement for an electric machine
ITTO20110199A1 (it) 2011-03-07 2012-09-08 Atop Spa Apparecchio e procedimento per l'allineamento di conduttori di elementi di bobine in nuclei di macchine dinamo elettriche per compiere operazioni di saldatura.
ITTO20110435A1 (it) 2011-05-16 2012-11-17 Atop Spa Apparecchio e procedimento per la realizzazione di elementi di bobine per nuclei di macchine dinamo elettriche mediante piegatura.
CN103828203B (zh) * 2011-09-27 2017-03-15 丰田自动车株式会社 分段线圈制造方法、分段线圈制造装置、以及使用该装置的分段线圈
US8745847B2 (en) 2011-11-17 2014-06-10 Remy Technologies, L.L.C. Method of P-forming a continuous conductor having a rectangular cross section and a stator including a stator winding formed from a P-formed conductor having a rectangular cross-section
US8789259B2 (en) 2011-11-17 2014-07-29 Remy Technologies, L.L.C. Method of winding a stator core with a continuous conductor having a rectangular cross-section and a stator core
US9467010B2 (en) 2011-11-17 2016-10-11 Remy Technologies, L.L.C. Method of winding a stator core with a continuous conductor having a rectangular cross-section and a stator core
JP5874438B2 (ja) * 2012-02-27 2016-03-02 日産自動車株式会社 回転電機の分布巻固定子、および回転電機の分布巻固定子の製造方法
US10461591B2 (en) * 2012-07-06 2019-10-29 Mitsubishi Electric Corporation Rotary electric machine with armature coil end top portions displaced in a radial direction
JP6000051B2 (ja) * 2012-10-11 2016-09-28 三菱電機株式会社 電気機械およびその製造方法
WO2014157621A1 (ja) * 2013-03-29 2014-10-02 アイシン・エィ・ダブリュ株式会社 ステータの構造
JP5907128B2 (ja) * 2013-08-21 2016-04-20 株式会社デンソー 回転電機の固定子
ITPI20130092A1 (it) 2013-10-18 2015-04-19 Atop Spa Apparecchiatura e metodo per produrre componenti di macchine dinamoelettriche
JP6135535B2 (ja) * 2014-02-07 2017-05-31 株式会社デンソー 回転電機の固定子
CN111245119B (zh) 2014-08-07 2023-03-14 日立安斯泰莫株式会社 旋转电机的定子，以及具备该定子的旋转电机
CN107534367B (zh) 2015-04-30 2019-08-20 Atop 有限公司 用于形成编织线圈组件的方法和设备
DE102015211356A1 (de) * 2015-06-19 2016-12-22 Wobben Properties Gmbh Verfahren zum Herstellen eines Stators eines Generators einer Windenergieanlage, sowie Formspule, Wicklungsaufbau und Stator
DE102015211355A1 (de) * 2015-06-19 2016-12-22 Wobben Properties Gmbh Formspule, Wicklungsaufbau sowie Stator eines Generators einer Windenergieanlage und Verfahren zum Herstellen eines Stators
ITUB20152330A1 (it) * 2015-07-20 2017-01-20 Atop Spa Metodo e apparecchiatura per inserire assemblati di bobine ondulate nelle cave di nuclei di macchine dinamoelettriche
JP2018534790A (ja) 2015-10-26 2018-11-22 ティーエム４・インコーポレーテッド 平角線コイルヘッドを成形するための機械およびそのための方法
JP6107990B2 (ja) * 2016-03-02 2017-04-05 株式会社安川電機 コイル製造用巻線部材
DE102016107929A1 (de) * 2016-04-28 2017-11-02 Wobben Properties Gmbh Aluformspule und Wicklungsaufbau sowie Stator eines Generators einer Windenergieanlage und Verfahren zum Herstellen eines Stators
NO345646B1 (en) * 2019-02-06 2021-05-25 Kongsberg Maritime CM AS Distributed double litz wire winding in open slots
JP7463740B2 (ja) * 2020-01-28 2024-04-09 株式会社デンソー 回転電機
US11632006B2 (en) * 2020-04-27 2023-04-18 Honeywell International Inc. Stator coil for high power density and efficiency electric machines

Family Cites Families (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US693578A (en) * 1901-01-12 1902-02-18 Henry H Wait Conductor for electromagnetic induction apparatus.
US688137A (en) * 1901-05-09 1901-12-03 Frederick Suellentrop Vegetable cutter or grater.
GB191011896A (en) * 1910-05-13 1910-09-01 Siemens Brothers Dynamo Works Improvements in or relating to the Armature Windings of Dynamo Electric Machines.
US1721636A (en) * 1923-03-30 1929-07-23 Delco Remy Corp Machine for forming armature conductors
US1658300A (en) * 1926-03-10 1928-02-07 John W Pleasant Coil spreader
GB545101A (en) * 1940-05-15 1942-05-11 British Thomson Houston Co Ltd Improvements in and relating to coils for dynamo-electric machines
US3079519A (en) * 1956-02-29 1963-02-26 Gen Electric Coil and method of insulating same
US2985106A (en) * 1958-05-28 1961-05-23 Gen Electric Thermal insulation system
US3453468A (en) * 1966-09-21 1969-07-01 Kurz & Root Co Inc Dynamoelectric machine winding arrangement with end turn insulation and method of making the same
US3543468A (en) * 1967-12-19 1970-12-01 Mira Pak Inc Method and apparatus for packaging with stationary inner mandrel for forming flat bottom package
US3631278A (en) * 1970-04-20 1971-12-28 Gen Electric Form-wound dynamoelectric machine with reduced coil distortion
US3675058A (en) * 1970-09-08 1972-07-04 Gen Electric Dynamoelectric machine utilizing pre-formed winding connectors and method of making
US3840416A (en) * 1971-03-31 1974-10-08 Licentia Gmbh Method of producing waterproof electrical coils
SE368890B (es) * 1971-12-02 1974-07-22 Asea Ab
CH559455A5 (es) * 1973-06-12 1975-02-28 Bbc Brown Boveri & Cie
FR2244284B1 (es) * 1973-09-18 1976-11-19 N I Experiment Avtomobilnogo
CH629042A5 (de) * 1978-06-29 1982-03-31 Bbc Brown Boveri & Cie Aus miteinander verdrillten teilleitern bestehende zwei- oder mehrschichtwicklung fuer eine elektrische maschine.
DE3008212C2 (de) * 1980-03-04 1985-06-27 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zur Herstellung von Statorwicklungen für Dreiphasen-Drehstromgeneratoren
US4321497A (en) * 1980-04-10 1982-03-23 Westinghouse Electric Corp. Peripheral connector ring stator end winding for dynamoelectric machines
US4346320A (en) * 1980-04-10 1982-08-24 Westinghouse Electric Corp. Dynamoelectric machine having improved interleaved stator end turns
JPS579248A (en) * 1980-06-20 1982-01-18 Toshiba Corp Assembling method for armature of rotary electric machine
GB2079194B (en) * 1980-07-09 1983-08-03 Westering Insulation Systems L Coil shaping apparatus
US4774428A (en) * 1987-05-15 1988-09-27 Synektron Corporation Compact three-phase permanent magnet rotary machine having low vibration and high performance
US4818909A (en) * 1988-01-15 1989-04-04 General Electric Company Insulated coil assembly
CA1307051C (en) * 1988-02-26 1992-09-01 Paolo Cielo Method and apparatus for monitoring the surface profile of a moving workpiece
DE3812726A1 (de) * 1988-04-16 1989-10-26 Veser F Vorrichtung zum einziehen von spulen in statoren von elektromotoren
DK267288A (da) * 1988-05-16 1989-11-17 Grundfos Int Fremgangsmaade til isaetning af en statorvikling i en stator
US5454156A (en) * 1994-04-18 1995-10-03 Morr; Charles W. Apparatus and method for inserting stator coils

Also Published As

Publication number Publication date
DE69504674T2 (de) 1999-05-06
BR9507850A (pt) 1997-09-16
CN1150869A (zh) 1997-05-28
JPH10507057A (ja) 1998-07-07
CA2186640C (fr) 2007-03-27
EP0766882A1 (fr) 1997-04-09
US5619787A (en) 1997-04-15
AU2404295A (en) 1996-01-19
JP3756516B2 (ja) 2006-03-15
CN1079177C (zh) 2002-02-13
CA2186640A1 (fr) 1996-01-04
TW273057B (es) 1996-03-21
WO1996000460A1 (fr) 1996-01-04
US5714824A (en) 1998-02-03
ATE171018T1 (de) 1998-09-15
DE69504674D1 (de) 1998-10-15
EP0766882B1 (fr) 1998-09-09
KR100305303B1 (ko) 2001-11-30

Similar Documents

Publication Publication Date Title
MX9606093A (es) Seccion de conductor para una estructura de estator de una maquina dinamoelectrica polifasica.
GB2222030B (en) Improvements in laminations
GB2286293A8 (en) Adjustable stator: winding construction: cooling and commutator construction in an electric machine
GB1490218A (en) Linear induction motors
EP0456498A3 (en) Reducing harmonic losses in dynamoelectric machine rotors
DE69215594D1 (de) Elektrischer hochgeschwindigkeitsmotor des type reluktanz
UA34455C2 (uk) Ротор турбогенератора
GB2189944B (en) Cooling in electric motors
FI932732A (fi) Roottorirakenne epätahtisähkökoneessa
EP0123800B1 (en) Low power electrical machine, in particular a collector motor
GB1501952A (en) Linear induction motor
IT1208322B (it) Dispositivo per l inserimento di matasse preavvolte nelle cave dello statore di macchine dinamo elettriche
CA2281450A1 (en) High frequency low loss electrode
GB2154157B (en) Coating windings in dynamoelectric machine
CN216775308U (zh) 多功能便捷式机箱及专用型材
CN220492718U (zh) 一种伺服电机用方形定子冲片
JPS5686045A (en) Stator for rotary electric machine
ES2148087A1 (es) Maquina electrica especialmente maquina de corriente trifasica.
GB8323817D0 (en) Cooling motor end-turns in compressor
GB2265498B (en) Improvements to electric motors,dynamos and alternators
SU1624604A1 (ru) Статор электрической машины
SU964860A2 (ru) Беспазовый статор электрической машины
SU1282263A1 (ru) Зубцова зона электрической машины
Horber Higher torque from hybird stepper motors.
JPS57156645A (en) Stator for three-phase motor