| 摘要 |
PURPOSE:To enable to shorten the accelerating time of a motor stably even if a load torque alters by calculating the detected current value and the detected speed value of the motor to calculate a load torque value, and increasing the reciprocal of the load torque value to the maximum value of the speed command. CONSTITUTION:The detected armature current value Ia and the detected rotating speed value NM of a DC motor 10 are inputted to a motor acceleration torque arithmetic unit 30, which thus divides the Ia by the NM and obtains a motor acceleration torque TM. Further, the differentiated values of the torque TM and the value NM are inputted to an arithmetic amplifier 26, which thus subtracts the torque TM and NM are inputted to an arithmetic amplifier 26, which thus subtracts the torque TM by the differentiated value of the detected value NM and calculates the load torque TL. This torque T1 is then inputted to a speed limit signal converter 27, which thus varies the limit value of the speed command to be inversely proportional to the TL. |
