| 摘要 |
PURPOSE:To prevent oscillation and to reduce noise by clamping an apparent torque command value voltage to be actually input to an operational amplifier al a level of a reference voltage irrespective of the rise of the torque command value voltage after the torque command value voltage reaches the reference voltage. CONSTITUTION:When a torque command value voltage VCTL rises over a reference voltage VREF, VREF<VCTL is satisfied, and hence a transistor Q8 is conducted, and a transistor Q7 is interrupted. Since the voltage VREF is constant, the rise of the voltage VCTL does not affect influence to the collector current of a transistor Q9. That is, the apparent torque command value voltage to be applied to an operational amplifier OP1 is clamped to the voltage VREF of a predetermined voltage level. As a result, the output current of the amplifier OP1 and hence a total current iM is held at a predetermined level, and hence the total current detection voltage VRS is finally clamped at the voltage VREF. |
