| 摘要 |
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.
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