| 摘要 |
PURPOSE:To prevent a motor from hunting or vibrating by reducing a current reference value at a predetermined ratio when the motor is stopped. CONSTITUTION:When a motor stop command is applied from a speed controller 4, a current reference IS output from a current limiting rate calculator 12 is reduced to a predetermined level. Thus, a motor speed is gradually reduced. When the stop of a motor 3 is detected by a speed detector 2, a motor stop signal from a motor speed zero detector 13 is supplied to a current limiting rate calculator 12. The calculator 12 reduces the reference IS at a predetermined ratio simultaneously when the signal is applied. Thus, it can prevent the motor from hunting or vibrating. |
