ELECTRIC POWER STEERING APPARATUS

摘要

An electric power steering apparatus in which the intensity and directions of drive currents flowing in remaining phases continues motor rotation driving. An abnormality detect unit (27) detects a conduction abnormality in drive systems for the respective phase coils of the 3-phase brushless motor (12). A steering assisting current command value calculating unit (31) calculates a steering assisting current command value. A normal time motor command value calculating unit (33) calculates three phase current command values according to the steering assisting current command value. An abnormal time motor command value calculating unit (34) calculates two phase current command values for using the two remaining phase coils. A command value select portion (35) selects the phase current command values calculated by the normal or abnormal time motor command value calculating unit. A motor control unit (36) drives the electric motor (12) according to the selected phase current command value.