| 摘要 |
PURPOSE:To make a current command value and a phase difference of torque small and to prevent the vibration of a shaft by providing a current control system to a speed rate control system forming a minor system out of the major system or the minor system controlling the speed of a motor. CONSTITUTION:AC power supply PS is converted into power to rotate a motor 2. A speed controller 7 outputs a speed rate command value omegaR* from a motor speed omega and a speed command value omega* detected by a speed operator 6 from an encoder 5 directly connected to the motor 2. (major system). A speed rate operator 8 calculates a speed rate detection value omegaR from the speed omega, the deviation with the command value omegaR* is inputted into a rate controller 9 to output a current command value I*. Based on the deviation between an input current I detected by CT 12 and the current command value I*, a current controller 10 controls a power converter 1 through a power controller 11. (minor system). According to the constitution, a phase delay of torque of the motor against the current command value is minimized, and the vibration of a shaft is suppressed effectively. |
