Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1995-06-07
1997-01-14
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310148, H02K 1310
Patent
active
055942903
ABSTRACT:
A multi-speed, direct current motor (120) incorporates a high speed (24) brush disposed between the low speed (22) and the common ground (26) brushes and having a non-arcuate end face (25) which, unlike the conventional arcuate brush end face (23,27), is not subject to speed-drift erosion. The non-arcuate end face (25) is configured of two offset surfaces (55,65 & 57,67) which intersect to provide a line of contact (43) between the end face (25) of the high speed brush (24) and the commutator (40) which is displaced from the center line of the high speed brush (24) in a direction counter to the direction of rotation of the motor, that is toward the leading edge (21) of the brush (24). The intersecting surfaces (55,65 & 57,67) may comprise either flat planar surfaces or contoured surfaces.
REFERENCES:
patent: 672449 (1901-04-01), Markey
patent: 2206366 (1940-07-01), Redmond
patent: 2375818 (1945-05-01), Peters
patent: 3020430 (1962-02-01), Neuhardt
patent: 3355611 (1967-11-01), Meyer et al.
patent: 5296774 (1994-03-01), Nishiwaki
patent: 5485049 (1996-01-01), Shannon et al.
Bexten Daniel P.
Shannon Larry S.
Welch David W.
Habelt William W.
Link Jonathan
Stephan Steven L.
United Technologies Motor Systems, Inc.
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