Patent ID: 8922143

Claim:
A control system for a rotary machine comprising: a power conversion circuit, which includes switching devices and controls a control amount including at least one of current, torque and flux linkage of the rotary machine by turning on and off the switching devices, the switching devices of the power conversion circuit turning on and off electric connection of voltage supply sections, which supply respective voltages different one another, and terminals of the rotary machine; an estimation section, which is configured to estimate a time period required for a degree of deviation between the control amount and a command value reaching a predetermined value with respect to a specified switching mode among switching modes indicating an on/off condition of each of the switching devices of the power conversion circuit; wherein: the estimation section is configured to set an update timing of the switching mode based on the estimated required time period; the estimation section includes a determination section configured to provisionally set a switching mode, estimate the required time period in accordance with each provisionally set switching mode, evaluate the switching mode based on an estimation result of the estimate of the required time period, and use the switching mode having a highest evaluation result of the evaluation of the switching mode in actually driving the power conversion circuit, and the control system further comprises a drive section configured to drive the power conversion circuit based on the determined switching mode; and the determination section is configured to assign a higher evaluation to the switching mode having a long required time period than to the switching mode having a short required time period.