Patent ID: 7504790
Filing Date: 2009-03-17
Classification: H02P

Abstract:
1. A control system for controlling an on duration of a switching element to which a direct current voltage is applied, thereby generating a cyclic current to be supplied to a multiphase rotary electric machine, the cyclic current allowing a portion of the multiphase rotary electric machine to rotate, the control system comprising: a storing unit configured to store a relationship between a workload associated with rotation of the portion of the multiphase rotary electric machine and a voltage utilization factor of the multiphase rotary electric machine, the voltage utilization factor including information representing how percentage the direct current voltage applied to the switching element is used by the multiphase rotary electric machine; a measuring unit configured to measure change in the workload associated with rotation of the multiphase rotary electric machine; and a pulse control unit configured to carry out a single pulse control to change the on duration of the switching element to be substantially equivalent to a half cycle of the cyclic current while continuously changing the voltage utilization factor based on the relationship stored in the storing unit and the measured change of the workload.