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EP0560972A1 - Positionnement en biais des toles polaires d'une machine a reluctance commutee afin de reduire le bruit acoustique - Google Patents

Positionnement en biais des toles polaires d'une machine a reluctance commutee afin de reduire le bruit acoustique

Info

Publication number
EP0560972A1
EP0560972A1 EP19920921815 EP92921815A EP0560972A1 EP 0560972 A1 EP0560972 A1 EP 0560972A1 EP 19920921815 EP19920921815 EP 19920921815 EP 92921815 A EP92921815 A EP 92921815A EP 0560972 A1 EP0560972 A1 EP 0560972A1
Authority
EP
European Patent Office
Prior art keywords
stator
rotor
poles
laminations
pair
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP19920921815
Other languages
German (de)
English (en)
Inventor
Marlin Lewis Stanley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of EP0560972A1 publication Critical patent/EP0560972A1/fr
Withdrawn legal-status Critical Current

Links

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
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
    • H02K1/246—Variable reluctance 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
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K19/00—Synchronous motors or generators
    • H02K19/02—Synchronous motors
    • H02K19/10—Synchronous motors for multi-phase current
    • H02K19/103—Motors having windings on the stator and a variable reluctance soft-iron rotor without windings
    • 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
    • H02K2201/06—Magnetic cores, or permanent magnets characterised by their skew

Definitions

  • the present invention relates generally to switched reluctance machines and, more particularly, to the skewing of rotor and stator laminations in order to reduce acoustic noise generated by the machine.
  • a switched reluctance machine is a brushless, synchronous machine having salient rotor and stator poles. There is a concentrated winding on each of the stator poles, but no windings or permanent magnets on the rotor. Each pair of diametrically opposite stator pole windings is connected in series or in parallel to form an independent machine phase winding of the multiphase SRM. Ideally, the flux entering the rotor from one stator pole balances the flux leaving the rotor from the diametrically opposite stator pole, so that there is no mutual magnetic coupling among the phases.
  • Torque is produced by switching current in each phase winding in a predetermined sequence that is synchronized with angular position of the rotor. In this way, a magnetic force of attraction results between the rotor poles and the stator poles that are approaching each other. The current is switched off in each phase before the rotor poles nearest the stator poles of that phase rotate past the aligned position; otherwise, the magnetic force of attraction would produce a negative, or braking, torque.
  • torque direction is independent of current direction. Therefore, in contrast to most other brushless machines which require bidirectional phase currents, a SMR power inverter can be configured to enable current flow ⁇ n only one direction through a phase winding.
  • Such an inverter generally employs one or more switching devices, such as transistors or thyristors, in series with each machine phase winding.
  • switching devices such as transistors or thyristors
  • Exemplary SRM converters are illustrated in commonly assigned U.S. Patent No. 4,684,867, issued to T.J.E. Miller on August 4, 1987, which is hereby incorporated by reference.
  • a SRM operates by switching the machine phase currents on and off in synchronism with rotor position. That is, by properly positioning the firing pulses relative to rotor angle, forward or reverse operation and motoring or generating operation can be obtained.
  • the desired phase current commutation is achieved by feeding backthe rotor position signal to a controller from a shaft angle transducer, e.g., an encoder or a resolver.
  • a SRM is typically noisy. In large part, this is due to the "ovaling" of the stator during machine operation.
  • an object of the present invention is to reduce the "ovaling" effect of an SRM stator as it rotates, thereby reducing the acoustic noise generated during SRM operation.
  • the laminations respectively comprising the rotor and stator poles of a SRM are skewed as they are stacked during machine assembly.
  • the electromagnetic force of attraction between the rotor poles and the stator poles of each energized phase is spread out, thereby reducing the tendency of the SRM to assume an oval shape during machine operation. In this way, the acoustic noise generated by the j
  • Figure 1 is a cross sectional view of a typical SRM rotor and stator 10 configuration
  • Figure 2 is a cross sectional view of a rotor and stator of a SRM, the rotor and stator each having skewed laminations in accordance with the present invention.
  • Figure 1 is a cross sectional view of a stator 10 and a rotor 12 of a typical switched reluctance machine (SRM) 14.
  • SRM switched reluctance machine
  • Rotor 12 of SRM 14 is rotatable in either a forward or reverse direction within stationary stator 10.
  • Rotor 12 has two pairs of diametrically opposite rotor poles
  • Stator 10 has three pairs of diametrically
  • stator pole coil windings 26a and 26b are shown as being wound only about stator poles 20a and 20b, respectively; however, it is to be understood that stator pole coil windings would generally be wound
  • the current I in each phase produces a magnetic flux linkage by generating flux in the directions indicated by arrows 28 and 30.
  • windings 26a and 26b are connected in series so that the current I flows in the direction indicated.
  • the electromagnetic force of attraction between the rotor poles and the stator poles of each energized phase causes the stator "ovaling" phenomena described hereinabove, resulting in noisy SRM operation.
  • FIG. 2 illustrates a SRM 114 according to the present invention having skewed rotor laminations 40 comprising rotor poles 116a, 116b,
  • stator laminations 50 comprising stator poles 120a, 120b, 122a, 122b, 124a and 124b.
  • the laminations of each stator poles and each rotor pole are arranged in a fan-like manner so as to spread out each respective pole.
  • acoustic noise generated by the SRM is substantially reduced.
  • only the stator pole laminations are skewed to reduce acoustic noise.
  • SRM 114 is shown in Figure 2 as having three-phases with six stator poles and four rotor poles, it is to be understood that the principles of the present invention apply to a SRM having any number of phases and also to any suitable combination of stator and rotor poles. While the preferred embodiments of the present invention have been shown and described herein, it will be obvious that such embodiments are provided by way of example only. Numerous variations, changes and substitutions will occur to those of skill in the art without departing from the invention herein. Accordingly, it is intended that the invention be limited only by the spirit and scope of the appended claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

Les tôles (40, 50) comprenant respectivement les pôles de rotor et de stator (116a, 116b, 118a, 118b, 120a, 120b, 124a, 124b) d'une machine à réluctance commutée (SRM) (114) sont positionnées en biais tandis qu'elles sont empilées pendant le montage de la machine afin de réduire la tendance de la SRM (114) à s'aplatir et donc à prendre une forme ovale pendant le fonctionnement de la machine. Il en résulte que le bruit acoustique produit par la SRM (114) pendant le fonctionnement de la machine est considérablement réduit.
EP19920921815 1991-10-09 1992-10-09 Positionnement en biais des toles polaires d'une machine a reluctance commutee afin de reduire le bruit acoustique Withdrawn EP0560972A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US77382291A 1991-10-09 1991-10-09
US773822 2004-02-06

Publications (1)

Publication Number Publication Date
EP0560972A1 true EP0560972A1 (fr) 1993-09-22

Family

ID=25099419

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920921815 Withdrawn EP0560972A1 (fr) 1991-10-09 1992-10-09 Positionnement en biais des toles polaires d'une machine a reluctance commutee afin de reduire le bruit acoustique

Country Status (5)

Country Link
EP (1) EP0560972A1 (fr)
AU (1) AU658946B2 (fr)
CA (1) CA2096244A1 (fr)
NZ (1) NZ244664A (fr)
WO (1) WO1993007671A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6700272B1 (en) 1997-09-30 2004-03-02 Emf 97 Elektro-Maschinen-Vertrieb-Magnettechnik- Und Forschungs Gmbh Reluctance motor with gearless step-down without electronic control of rotating field
DE19743380C1 (de) * 1997-09-30 1999-03-25 Emf 97 Gmbh Reluktanzmotor
FR2809240A1 (fr) * 2000-05-17 2001-11-23 Minarro Bernot Ind Diffusion C Machine electrique homopolaire et procede de fabrication d'une telle machine
FR3029026B1 (fr) * 2014-11-20 2018-01-19 Valeo Systemes De Controle Moteur Machine electrique presentant des dents helicoidales pour application dans un vehicule automobile
CN111245127A (zh) * 2020-03-20 2020-06-05 隆中电机技术（昆山）有限公司 一种无刷电机转子

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB215433A (en) * 1923-02-07 1924-05-07 Matthew William Walbank Mackie Improvements in dynamos and motors
US1835505A (en) * 1930-10-09 1931-12-08 L S Brach Mfg Corp Synchronous clock motor
US4260926A (en) * 1979-03-16 1981-04-07 Societe Elpalux Variable reluctance electric motor with progressively saturable poles
JPS57180339A (en) * 1981-04-29 1982-11-06 Mitsubishi Electric Corp Field core for rotary electric machine
EP0180815B2 (fr) * 1984-10-19 1994-12-28 Kollmorgen Corporation Machine à réluctance variable avec vitesse variable

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9307671A1 *

Also Published As

Publication number Publication date
NZ244664A (en) 1995-04-27
AU2862892A (en) 1993-05-03
CA2096244A1 (fr) 1993-04-10
WO1993007671A1 (fr) 1993-04-15
AU658946B2 (en) 1995-05-04

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Legal Events

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18D Application deemed to be withdrawn

Effective date: 19961029

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Inventor name: STANLEY, MARLIN, LEWIS