Multi-speed motor

Details Multi-speed motor Multi-speed motor

1994-05-25

1996-01-16

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Rotary

H02K 1300

Patent

active

054850495

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: 2375818 (1945-05-01), Peters
patent: 3355611 (1967-11-01), Meyer et al.
patent: 3774091 (1973-11-01), Kearns
patent: 4694214 (1987-09-01), Stewart, Sr.
patent: 4774754 (1988-10-01), Stewart, Sr.
patent: 5006747 (1991-04-01), Stewart, Sr.

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