CONTROL APPARATUS FOR AC ROTATING MACHINE

摘要

In order to attain a control apparatus for an AC rotating machine, wherein a start up of an AC rotating machine, especially a synchronous motor using permanent magnets, using a position-sensor-less vector control can be executed with reliability and stability, the control apparatus for an AC rotating machine comprises: a steady speed calculator (16) that calculates the rotation angle frequency of an AC rotating machine (3) to be used while executing steady state control of the AC rotating machine (3), on the basis of the AC current and a voltage command; and an start-up speed calculator (17) that calculates the rotation angle frequency of the AC rotating machine (3) to be used while executing start-up control during a prescribed period after a start up of the AC rotating machine (3), on the basis of the AC current and the voltage command. While executing the start-up control, a current command is corrected so that the amplitude of the AC voltage of the voltage command will be a constant value not more than the maximum output voltage of a power converter (2).