Patent ID: 8164311
Filing Date: 2012-04-24
Classification: H02P

Abstract:
1. A control device which controls a controlled variable of an electric rotating machine by controlling a power inverting circuit, having a plurality of switching elements connecting and disconnecting a plurality of voltage applying portions applying different voltages with/from terminals of the electric rotating machine, to be set in one of voltage vectors determined according to on and off states of the switching elements, the controlled variable being at least one of an electric current flowing through the electric rotating machine, a torque of the electric rotating machine and a magnetic field of the electric rotating machine, wherein the control device comprises: a first predicting unit that, when a plurality of controlled states of the power inverting circuit corresponding to the voltage vectors are imaginarily set so as to set the power inverting circuit in each of the controlled states at a second renewal time, predicts the controlled variable of the electric rotating machine for each of the imaginarily-set controlled states; a control unit that determines one controlled state of the power inverting circuit, expected at the second renewal time, from the controlled variable predicted by the first predicting unit and sets the power inverting circuit in the determined controlled state at the second renewal time; and a second predicting unit that receives a present controlled state already determined by the control unit to be used for the power inverting circuit at a first renewal time preceding the second renewal time and predicts an initial value, to be used for the prediction performed by the first predicting unit, by using the present controlled state, and wherein a value of the controlled variable predicted by the first predicting unit relates to a time after a time relating to the value predicted by the second predicting unit.