TORQUE LIMITER OF CONVEYING MOTOR IN CONVEYING APPARATUS

摘要

PURPOSE:To suppress an impact force at stopping time by switching the set level of a torque limiter to a low level when a rotating speed signal substantially comes to constant value and a low speed feed designation signal is input. CONSTITUTION:An instruction unit 22 outputs a speed command value V on the basis of an operation designation signal from a sequence instruction unit 20 and a speed set value from a speed setter 21. A differential amplifier 23 applies a control signal in response to a deviation between a speed command value V and a speed signal to a power amplifier 2. A torque limiter 28 applies a signal voltage -V' of the prescribed value indicated in advance when a current I flowed to a conveying motor 10 exceeds the prescribed level to limit a current I. A torque limiter switch 40 outputs a switching signal S5 when a speed signal comes to substantially constant value and a low speed feed designation signal from the unit 20 is output, thereby reducing the limit value of the limiter 28.