Dynamoelectric machine with brush wear sensor

Details Dynamoelectric machine with brush wear sensor Dynamoelectric machine with brush wear sensor

1996-09-03

1998-03-24

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310242, 310249, H02K 1300

Patent

active

057316503

ABSTRACT:
A brush wear sensor for a dynamoelectric machine having a rotating commutator and brushes which contact the commutator detects movement of the brush a predetermined distance inwardly which indicates excessive wear of the brush. The brush wear sensor is normally electrically isolated from the brush and from the brush holder in which the brush is mounted. When excessive brush wear occurs, the brush wear sensor contacts the spring which moves the brush as it wears and urges the brush into contact with the commutator. The brush wear sensor is then electrically connected to the brush holder and the brush, providing an indication that the brush has moved the predetermined distance inwardly. The brush wear sensor allows the detection of excessive brush wear without disassembling and visually inspecting the brushes.

REFERENCES:
patent: 4024525 (1977-05-01), Baumgartner et al.
patent: 4316186 (1982-02-01), Purdy et al.
patent: 4344009 (1982-08-01), Reynolds
patent: 4344072 (1982-08-01), Harper, Jr.
patent: 4348608 (1982-09-01), Michael
patent: 4420705 (1983-12-01), Kimberlin
patent: 4471254 (1984-09-01), Yamada et al.
patent: 4488078 (1984-12-01), Orton
patent: 4723084 (1988-02-01), Reynolds
patent: 4739208 (1988-04-01), Kimberlin
patent: 4743787 (1988-05-01), Bunner et al.
patent: 4831302 (1989-05-01), Dietrich et al.

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