TORQUE COMMANDING CIRCUIT FOR AC SERVO-SYSTEM

申请公布号：

JPS63283486(A)

申请号：

JP19870117492

申请日期：

1987.05.14

申请公布日期：

1988.11.21

申请人：

YASKAWA ELECTRIC MFG CO LTD

发明人：

HIRANO MASARU

分类号：

H02P23/00

主分类号：

H02P23/00

摘要：

PURPOSE:To permit a torque command to be kept constant even when the impedance of a torque limiting circuit is changed, by a method wherein a buffer amplifier is connected between the output stage of a speed amplifying circuit and the input stage of the torque limiting circuit. CONSTITUTION:A speed amplifying circuit 1 compares a speed command Vref with a speed detecting signal VTG and outputs a voltage command VSPO. On the other hand, a torque limiting circuit 2 outputs a torque command Tref in accordance with an input signal and nullify the torque command Tref of positive or negative side when a positive side drive prohibiting contact 204 or a negative side drive prohibiting contact 203 is opened by an end limit switch. In this case, the torque command of reverse direction is outputted. A buffer amplifier 10 is inserted and connected between the speed amplifying circuit 1 and the torque limiting circuit 2. According to this constitution, the torque command may be kept constant even when the impedance of the torque limiting circuit 2 is changed.