| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor disconnection detection system that can securely detect whether a motor or the like is disconnected or not even if the motor is at rest. SOLUTION: This motor disconnection detection system has motor control means (12 and 16) for alternately applying negative and positive voltages to the motor M in specific time ratio, a motor current detection means 14 for detecting current that flows in the motor M, signal conversion means (20 and 22) for differentiating detection output in the motor current detection means 14 for converting to a pulse signal, a count means 24 for counting the number of pulses of the pulse signal within unit time that is converted by the signal conversion means (20 and 22), and a judgment means 26 for judging that the motor M or the wiring system is disconnected when a count value that is counted by the count means 24 is smaller than a preset threshold. |
