Self-diagnosing apparatus for brushless motor

Details Self-diagnosing apparatus for brushless motor Self-diagnosing apparatus for brushless motor

1993-06-17

1995-05-23

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 30, 361 31, 361 33, H02H 708

Patent

active

054186765

ABSTRACT:
A self-diagnosing apparatus for a brushless motor which has a voltage detection circuit for detecting drive current to the brushless motor, and for outputting voltage at one of different levels corresponding to a short circuit condition, an open circuit condition and other conditions. When the output of the voltage detection circuit is at a high (H) level, a short circuit condition is determined, whereas when that output is at a low (L) level, an open circuit condition is determined. When the output of the voltage detection circuit is at a level intermediate between "H" and "L" levels, and simultaneously when the output voltage does not pulsate, a motor lock condition is determined.

REFERENCES:
patent: 4441136 (1984-04-01), Hampshire
patent: 4712053 (1987-12-01), Numata
patent: 4925765 (1988-02-01), Miller
patent: 5057962 (1991-10-01), Alley et al.
patent: 5076761 (1991-12-01), Krohn et al.

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