Brush assembly including brush wear detector

Details Brush assembly including brush wear detector Brush assembly including brush wear detector

1986-11-13

1988-04-19

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310245, 310247, 310248, 200 614, 335153, H02K 514

Patent

active

047392088

ABSTRACT:
A brush wear detector and indicator for the brush elements contacting the rotating commutator or slip rings of a dynamoelectric machine includes, in addition to a self winding bias spring located on the brush holder for applying force to the brush assembly, a permanent magnet, located either on a brush element or the bias spring, and a reed switch located on the brush holder adjacent the assembly. The magnet moves inwardly as the brush element wears and actuates the read switch at a point indicative of a worn condition. Activation of the reed switch causes an indicator such as a lamp to become energized, signalling a need for brush element replacement.

REFERENCES:
patent: 2691114 (1954-10-01), Lykins
patent: 3068333 (1962-12-01), Hewitt, Jr.
patent: 3292121 (1966-12-01), Bergstrasser
patent: 4213110 (1980-07-01), Holce
patent: 4214220 (1980-07-01), Queen
patent: 4348608 (1982-09-01), Michael
patent: 4456897 (1984-06-01), Holce et al.
patent: 4488078 (1984-12-01), Orton
patent: 4567414 (1986-01-01), Berings

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