| 摘要 |
PURPOSE:To perform current control up to the range exceeding the response frequency, by correcting the phase error and current error due to delay of response of a current control system with a forecasting control in advance. CONSTITUTION:A delay phase simulation circuit 10 inputs a current phase reference signal Costheta and outputs a signal Cos(theta-phi) in which a phase delay phi of the current control system is forecast. A phase difference detection circuit 11 inputs an output signal Cos(theta-phi) of a delay phase simulation circuit 10 and the current phase reference signal Costheta and detects the phase differene phi. A phase delay correction circuit 12 inputs the output signal phi of the circuit 11 and the current phase reference signal Costheta, and outputs the signal Cos(theta+phi) forecasting and correcting the phase delay phi of the current control system. A three- phase AC motor is used and each phase current is supplied from three control circuits while keeping the phase difference of electric angle 120 degrees. |
