Patent ID: 7589486

Claim:
A control system for controlling, based on a comparison between a waved real current to be supplied to a multiphase rotary electric machine and a hysteresis region established by a waved command signal, a switching timing of a switching element of an inverter to which a direct current voltage is applied to thereby match the waved real current with a waved request current, the waved real current allowing a portion of the multiphase rotary electric machine to rotate, the waved command signal being set to the waved request current, the waved request current being required for the multiphase rotary electric machine to generate a request torque, the control system comprising: a determining unit configured to determine whether a workload associated with rotation of the portion of the multiphase rotary electric machine is equal to or greater than a corresponding predetermined value; and a changing unit configured to, when it is determined that the workload is equal to or greater than the predetermined value, change the waved command signal from being set to the waved request current so as to determine the switching timing of the switching element based on a positional relation between the waved request current and the changed waved command signal.