Title:
REDUCED NOISE DYNAMOELECTRIC MACHINE
Document Type and Number:
WIPO Patent Application WO2002029957
Kind Code:
A3
Abstract:
An electromagnetic machine includes a rotor having a plurality of poles and a stator also having a plurality of poles. The poles for the rotor are divided into a first and second set of radially opposed pairs. The first set has uniform faced poles. The second set has a notched face. The stator includes radially opposed pairs of poles having uniform faced poles. The rotor and stator are disposed for movement relative to each other such that the first and second sets of poles for the rotor are movable in relation to the radially opposed pairs of the stator. The electrical interaction between uniform faced poles of the rotor with uniform faced poles of the stator produces a first normal force profile. The electrical interaction between notched faced poles of the rotor with uniform faced poles of the stator produces a second normal force profile. The first and second normal forces act dynamically in time or position on the stator as the rotor moves in relation to the stator. Thus, the noise spike at the harmonics of the commutation frequency are reduced.
Inventors:
HORST GARY E
Application Number:
PCT/US2001/030441
Publication Date:
September 25, 2003
Filing Date:
September 28, 2001
Export Citation:
Assignee:
EMERSON ELECTRIC CO (US)
International Classes:
H02K29/03; (IPC1-7): H02K19/10
Foreign References:
| US5844343A | 1998-12-01 | |||
| US5801463A | 1998-09-01 |
Other References:
CAMERON D E ET AL: "THE ORIGIN AND REDUCTION OF ACOUSTIC NOISE IN DOUBLY SALIENT VARIABLE-RELUCTANCE MOTORS", IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, IEEE INC. NEW YORK, US, vol. 28, no. 6, 1 November 1992 (1992-11-01), pages 1250 - 1255, XP000331289, ISSN: 0093-9994
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 12 29 October 1999 (1999-10-29)
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 12 29 October 1999 (1999-10-29)
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