| 摘要 |
PURPOSE:To automatically eliminate a malfunction phenomenon by temporarily reversely rotating a motor when an excess load is applied to the motor, and the returning the motor to the normal rotation. CONSTITUTION:When a switch 12 is closed, a normal rotation signal is output from an AND circuit 10, and a normal direction current is flowed to a motor 5. At this time, if the state that a motor current detected by a current detecting resistor 2 is the prescribed value or higher continues for the prescribed time or longer, a comparator 8 outputs a signal. Thus, a reverse rotation signal is output from an AND circuit 11, and a reverse current is flowed to the motor 5. When the prescribed time is then elapsed, a normal rotation signal is again output from the AND circuit 10. Thus, a defect can be automatically removed to continue the normal operation. |
