| 摘要 |
PURPOSE:To keep a torgue apportionment ratio between motors constant during acceleration and deceleration by automatically varying the current value of the current limiter in a motor which performs the current control. CONSTITUTION:A differential circuit comprising capacitor C1, resistor R5, and an operation amplifier OA1 senses the variation of a speed reference signal REF and generates the output. The potential at point B, which is caused by the voltage dividing by resistors R11, R12, and R2 in a current-limiting-value set-up circuit of a motor M2, is normally set at the signal level corresponding to the rated current of the motor M2. A field effect transistor 1FET is actuated by the output of the differential circuit, shorting the resistor R11, thereby the potential at the point B is increased to the current limiting value which is allowable for a short time. When the motor is stopped or decelerated, a field effect transistor 2FET is actuated, shorting a resistor R31, thereby the potential at a point C is set to the current limiting value which is allowable for a short time. |
