| 摘要 |
PURPOSE:To smoothly accelerate or decelerate a motor by detecting the load current to correct the acceleration or deceleration time, and detecting the power drive and regenerative mode of the motor to switch the polarity of the correcting amount, thereby always producing the optinum torque. CONSTITUTION:A load is increased during acceleration, a load current is increased, and when they exceeds the level of a setter 22, the output of a comparator 21 becomes ''1''. On the other hand, since the motor is driven at the accelerating time so that the phase reference 90 deg., the output of a comparator 26 becomes ''1'', a contact 24a is closed, and the voltage of negative level is applied by a polarity inverter 23 to an input resistor 25, positive level is applied to the input resistor 19, the increase in the frequency reference of the output of an integrator 17 is decelerated, and is set to the value to meet the load. The voltage of the polarity reverse to the polarity at the regenerating and hence accelerating times of the motor is applied to the input resistor 25 of the integrator 17. |
