| 摘要 |
PURPOSE:To prevent a slip at a drive in the backward position by outputting a slip signal outputted by a drive in the forward position to said drive in the backward position after delaying said signal by a specified period of time. CONSTITUTION:A slip detection signal SG indicating a slip of motor enters a slip limiter 1 so that a slip suppression signal S for reducing a torque pat tern T* is outputted. A slip transmission signal Si sent from a drive in the forward position is delayed according to a speed V by a delay circuit 4, inputted to a high-level priority circuit 6 via waveform shaping circuit 5 to be compared with a slip suppression signal S. Then, a higher level signal is transmitted as a slip transmission signal So to a drive in the backward position and subtracted from said torque pattern T* by an adder 2 to weaken a generated torque. The delay time of said delay circuit 4 corresponds to a time interval for said drive in the forward position and a main drive to pass through the same spot. |
