| 摘要 |
The electric power steering system detects a steering torque Ts applied to a steering member (not shown), determines a q-axis current i*q and a d-axis current i*d of a motor in dq coordinates, on the basis of the detected steering torque Ts, determines a q-axis voltage V*q and a d-axis voltage V*d, on the basis of a power supply voltage Ed, such that the determined q-axis current i*q and d-axis current i*d flow through the motor, converts the q-axis voltage V*q and the d-axis voltage V*d into three-phase voltages V*u, V*v, and V*w, and applies the three-phase voltages V*u, V*v, and V*w to drive the motor, thereby assisting steering. The electric power steering system includes a limiter unit which limits the q-axis voltage V*q to be smaller than √{square root over ((3n2Ed2/8-Vd2))} (n=1, 2, or 2/√{square root over (3)}).
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