| 摘要 |
A rotational angle sensor used in an electric power steering apparatus detects a rotational angle of a motor shaft at a portion on a steering system side, as a motor rotational angle (&thetas;m). A MPU sets a base correction amount (&Dgr;&thetas;′m) based on a q-axis actual current value (Iq). The MPU sets a rotational angle correction amount (&Dgr;&thetas;m) used to correct the motor rotational angle (&thetas;m) by decreasing the base correction amount (&Dgr;&thetas;′m) as a rotational angular speed (ω) increases and by increasing the base correction amount (&Dgr;&thetas;′m) as a torque differential value (dT/dt) increases.
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