| 摘要 |
PURPOSE:To stably operate even if invaded by noise by reducing impedance of a torque command signal of torque command modes of a plurality of modes of acceleration torque, deceleration torque, torque holding by impedance reducing means and outputting the signal from torque command means. CONSTITUTION:Even if transistors 6, 7 are together turned OFF, an output PD of torque command means 2 does not become a high impedance by the operation of impedance reducing means 10, but reduced in impedance to parallel impedance of resistors 11, 12. When the output PD becomes a middle level, an output VT of an amplifier 3 is operated to hold a present level. Thus, power is supplied to a motor 1 in response to the output PD of the means 2. As a result, the motor 1 is controlled at a predetermined speed, but the output PD does not become a high impedance. Even in any case, a low impedance is held. |
