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
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.
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