| 摘要 |
PURPOSE:To compensator the induced voltage and the phase delay of a motor by increasing or decreasing a current command to cancel the increase or decrease of a phase current due to counterelectromotive force. CONSTITUTION:A speed compensating element 21 and a limiter 27 outputs a torque tau0 in response to a deviation between a speed command and a feedback speed signal vf converted by a converter 22 from a position signal theta. Then, the torque command tau0, the feedback speed signal vf and a value multiplied by a compensating coefficient K (K, tau0, Vf) are added to the torque command tau0 as a torque command tau. Thus, the acceleration to high speed rotation is obtained, and it can prevent a defect due to the switching element overcurrent owing to the increase in the regenerative current at the deceleration time. |
