Control device for electric rotating machine

A control device for controlling a plurality of switching elements of an electric power inverter circuit having a plurality of connecting points, which are connected with respective terminals of an electric rotating machine and are set at respective electric potentials different from one another, by selecting one switching element or more from the switching elements and by changing states of the selected switching elements and for controlling a controlled variable of the electric rotating machine, comprising:

• a predicting unit that performs a prediction for the controlled variable of the electric rotating machine, when the electric power inverter circuit is set in one of a plurality of operating states to set the switching elements in states corresponding to the ope rating state;
• an operating state determining unit that determines one of the operating states of the electric power inverter circuit as a determined operating state by using the predicted controlled variable and an instructed value of the controlled variable;
• and
• a control unit that controls the electric power inverter circuit to actually set the electric power inverter circuit in the determined operating state,
• wherein the predicting unit sets a value of the controlled variable, actually detected from the electric rotating machine, or a value of a physical quantity, from which the value of the control variable can be obtained and which is actually detected from the electric rotating machine, as an initial value to predict a first value of the controlled variable or the physical quantity on the basis of the initial value as an input parameter in the operating state determination of the operating state determining unit, and predicts the first value of the controlled variable or the physical quantity as the input parameter in a predetermined period of time, starting at a time when one operating state set in the electric power inverter circuit is changed to another operating state, by using a second value of the controlled variable or the physical quantity, which has been predicted based on a value of the controlled variable or the physical quantity detected before the change of the operating state set in the electric power inverter circuit, as the initial value in place of a value of the controlled variable or the physical quantity detected in the predetermined period of time.