| 摘要 |
PURPOSE:To control to operate a commutatorless motor by an accurate current with a speed limiting function of a microcomputer by providing an arithmetic circuit having a current command external calculator, a current command internal calculator and a sorting signal generator. CONSTITUTION:An arithmetic circuit 4' is provided in a microcomputer, current commands IAO1, IAO2 and power drive or regenerative mode discrimination signals MB1, MB2 of regeneration mode are obtained from a current command internal calculator 42 for applying a signal of a speed setter 5 and a speed feedback signal and a current command external calculator 41 for applying a set signal SA and a feedback signal SB, inputted to a sorting signal generator 43 to generate a current command IAO' and a discrimination signal MB', a frequency converter 1 is controlled to drive a motor 2. When the both MB1, MB2 are, for example, power mode in case of IAO1>IAO2, the IAO2 is selected to deliver IAO' and MB'. Accordingly, the abnormal rise of the motor speed can be suppressed to accurately control it. |
