| 摘要 |
<P>PROBLEM TO BE SOLVED: To detect the abnormal states of the locked state and open state of a motor with an overcurrent detection feature, and to stop an operation and notify a user of the abnormal state easily. <P>SOLUTION: A failure detector for a motor has the motor 11 with an overcurrent preventive circuit and a control section 12 controlling the motor 11 with the overcurrent preventive circuit. The control section 12 has a current detecting means 14 detecting a current flowing through the motor 11 with the overcurrent preventive circuit. The control section 12 detects and stores the maximum values and minimum values of the current flowing at every fixed time under the state applying a voltage to the motor 11 with the overcurrent preventive circuit. The control section 12 compares the fluctuation widths of the maximum values and the minimum values of the current flowing through the motor 11 with the overcurrent preventive circuit at every fixed time with a threshold set to the control section 12. The control section 12 decides as a failure when a large state continues for a fixed period or more, stops the motor 11 with the overcurrent preventive circuit and informs the user of the stop through a failure information means 21. <P>COPYRIGHT: (C)2009,JPO&INPIT |
