| 摘要 |
An electric power steering system is provided which includes a current command value calculation unit 10 for calculating a current command value based on a steering torque signal and a vehicle speed signal and a motor driving unit 52 for controlling a motor 8 for imparting a steering assist force to a steering mechanism based on the current command value. The electric power steering system has further a voltage detection unit 17 for detecting a voltage of a power supply source 11 for supplying power to the motor driving unit 52 and a phase compensating unit 58 provided on the current command value calculation unit 10 and adapted to select characteristics based on a voltage of the power supply source.
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