| 摘要 |
PURPOSE:To smoothly decelerate an AC motor by decelerating the rotating speed of the motor while gradually smoothly reducing the energizing frequency when decelerating the rotating speed of the motor by the regenerative operation. CONSTITUTION:When an induction motor 101 is stopped or is decelerated at its rotating speed, a command speed VCMD is decelerated. Thus, the speed deviation epsilon becomes abruptly negative, the frequency of the primary current applied to the motor 101 is reduced, and the deceleration due to the regenerative operation will start. A filter is provided between a phase compensator 109 and an absolute value circuit 109b, and the energizing frequency of the primary current outputted from a microcomputer 113 is gradually reduced, and the regenerating operation is slowly started. |
