Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1982-06-23
1984-02-21
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 51, 310237, 181175, H02K 1304
Patent
active
044332637
ABSTRACT:
A commutator has a plurality of spaced, electrically conducting segments, each of which has a physical dimension determining the relative time duration of brush contact with said segment during commutator rotation with audible brush noise being generated between the brush and said consecutive segments, the noise including a fundamental frequency component at a frequency related to the frequency at which the consecutive segments pass the brush. The physical dimension of the consecutive segments varies from each segment to the next according to a predetermined pattern effective to vary the relative time of brush contact from each segment to the next during rotation and thus reduce the amplitude of the fundamental frequency components to make the brush noise less tonal in character and thus less annoying.
REFERENCES:
patent: 2285201 (1942-06-01), Groot et al.
patent: 2956186 (1960-10-01), Wall
patent: 3314132 (1967-04-01), Van Dorn
patent: 4099077 (1978-07-01), Maekawa
patent: 4188713 (1980-02-01), Kawano
patent: 4224542 (1980-09-01), Kawano
R. C. Mellin & G. Souran, "Controlling Tonal Characteristics of the Aerodynamic Noise . . . "; Journal of Basic Engineering.
Buchanan, Jr. Harry C.
Cornwell, Jr. William D.
Longhouse Richard E.
General Motors Corporation
Sigler Robert M.
Skudy R.
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