| 摘要 |
PURPOSE:To prevent the fluctuation of terminal voltage and power factor caused by the load fluctuation, by correcting the ignition phase of an inverter by a DC voltage control circuit and by correcting and controlling the field current by a terminal voltage control circuit. CONSTITUTION:A vector computing element 20 outputs the field current command Ifp and the phase command beta of an inverter from the armature current Ia of an AC motor, the power factor angle command signal phi and the no-load terminal voltage command V0. An adder 25 adds to the phase command betaa signal obtained by amplifying the deviation between the output signal of a DC current command circuit 21 and the DC voltage detection signal and it controls the phase of the inverter. An adder 30 adds the deviation between the output signal Vref of a terminal voltage command circuit 26 and the terminal voltage detection signal Vfb to the field current signal Ifp and it gives the field current signal to the field current control circuit. |
