| 摘要 |
In a device for controlling the reverse rotation of a motor, output pulses of a detector (3) connected to an axis of rotation of a motor (1) are counted for each very small unit time period DELTA t after a reverse rotation instruction is output to the motor (1), and the speed N and the acceleration alpha of the motor are calculated for each very small unit time period DELTA t. It is judged that the motor (1) is rotated in the reverse direction at the time point where the acceleration alpha is switched from the negative to the positive when the calculated speed N of the motor is not more than a predetermined reference speed Nth. In addition, when it is judged that the motor is not rotated in the reverse direction within a predetermined time period which has elapsed after a reverse rotation instruction was output to the motor (1), it is judged that an abnormality has occured in the control device, so that the motor (1) is stopped. <IMAGE> |
