WO1993007671A1 - Skewing of pole laminations of a switched reluctance machine to reduce acoustic noise - Google Patents
Skewing of pole laminations of a switched reluctance machine to reduce acoustic noise Download PDFInfo
- Publication number
- WO1993007671A1 WO1993007671A1 PCT/US1992/008668 US9208668W WO9307671A1 WO 1993007671 A1 WO1993007671 A1 WO 1993007671A1 US 9208668 W US9208668 W US 9208668W WO 9307671 A1 WO9307671 A1 WO 9307671A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stator
- rotor
- poles
- laminations
- pair
- Prior art date
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 Electric Motors In General (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU28628/92A AU658946B2 (en) | 1991-10-09 | 1992-10-09 | Skewing of pole laminations of a switched reluctance machine to reduce acoustic noise |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US77382291A | 1991-10-09 | 1991-10-09 | |
US773,822 | 1991-10-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1993007671A1 true WO1993007671A1 (en) | 1993-04-15 |
Family
ID=25099419
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1992/008668 WO1993007671A1 (en) | 1991-10-09 | 1992-10-09 | Skewing of pole laminations of a switched reluctance machine to reduce acoustic noise |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0560972A1 (en) |
AU (1) | AU658946B2 (en) |
CA (1) | CA2096244A1 (en) |
NZ (1) | NZ244664A (en) |
WO (1) | WO1993007671A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19743380C1 (en) * | 1997-09-30 | 1999-03-25 | Emf 97 Gmbh | Energy conversion reluctance motor |
FR2809240A1 (en) * | 2000-05-17 | 2001-11-23 | Minarro Bernot Ind Diffusion C | Homo-polar electrical machine and fabrication method, uses stampings from a flat metallic sheet, shaped teeth to support conductors |
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 |
FR3029026A1 (en) * | 2014-11-20 | 2016-05-27 | Valeo Systemes De Controle Moteur | ELECTRIC MACHINE HAVING HELICOIDAL TEETH FOR APPLICATION IN A MOTOR VEHICLE |
Citations (4)
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 |
GB2167910A (en) * | 1984-10-19 | 1986-06-04 | Kollmorgen Tech Corp | Reluctance motors |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57180339A (en) * | 1981-04-29 | 1982-11-06 | Mitsubishi Electric Corp | Field core for rotary electric machine |
-
1992
- 1992-10-08 NZ NZ24466492A patent/NZ244664A/en unknown
- 1992-10-09 EP EP19920921815 patent/EP0560972A1/en not_active Withdrawn
- 1992-10-09 CA CA 2096244 patent/CA2096244A1/en not_active Abandoned
- 1992-10-09 AU AU28628/92A patent/AU658946B2/en not_active Ceased
- 1992-10-09 WO PCT/US1992/008668 patent/WO1993007671A1/en not_active Application Discontinuation
Patent Citations (4)
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 |
GB2167910A (en) * | 1984-10-19 | 1986-06-04 | Kollmorgen Tech Corp | Reluctance motors |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 7, no. 27 (E-156)(1172) 3 February 1983 & JP,A,57 180 339 ( MITSUBISHI DENKI ) 6 November 1982 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19743380C1 (en) * | 1997-09-30 | 1999-03-25 | Emf 97 Gmbh | Energy conversion reluctance motor |
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 |
FR2809240A1 (en) * | 2000-05-17 | 2001-11-23 | Minarro Bernot Ind Diffusion C | Homo-polar electrical machine and fabrication method, uses stampings from a flat metallic sheet, shaped teeth to support conductors |
FR3029026A1 (en) * | 2014-11-20 | 2016-05-27 | Valeo Systemes De Controle Moteur | ELECTRIC MACHINE HAVING HELICOIDAL TEETH FOR APPLICATION IN A MOTOR VEHICLE |
WO2016079448A3 (en) * | 2014-11-20 | 2016-08-25 | Valeo Systemes De Controle Moteur | Electric machine having helical teeth for use in a motor vehicle |
Also Published As
Publication number | Publication date |
---|---|
AU2862892A (en) | 1993-05-03 |
NZ244664A (en) | 1995-04-27 |
EP0560972A1 (en) | 1993-09-22 |
AU658946B2 (en) | 1995-05-04 |
CA2096244A1 (en) | 1993-04-10 |
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