| 摘要 |
PURPOSE:To increase the accuracy of a torque by applying a compensation to a speed detecting arithmetic circuit (SD) so that the output of a detector becomes zero and storing a zero torque control signal in a memory at that time and giving a compensation to SD with the use of the zero torque control signal. CONSTITUTION:An induction motor IM is controlled at the time of testing so that a torque current I2 becomes zero. That is, a deviation in torque between a zero set torque and a detected torque is amplified by a zero torque control amplifier 11 and stored into a memory and at the same time inputted to a multiplier 14. The speed of the SD 5 is differentiated by a speed differentiating circuit 13 to input the rate of acceleration and deceleration to the multiplier 14. The output thereof is added to the output of the SD 5 by an adder A1 to compensate for a torque operational error at the time of acceleration and deceleration. The zero torque control signal stored in a memory circuit 12 at the time of testing and the rate of acceleration and deceleration of the differentiating circuit 13 are always inputted to the multiplier 14 and added to the speed of the SD 5, thereby performing compensation in response to the rate of acceleration and deceleration of a torque operational error at the time of acceleration and deceleration. |
