Patent ID: 7076352

Claim:
An electric power steering apparatus comprising: a steering wheel; a first resolver of pole pair number â€˜mâ€™, for detecting a rotating angle of a steering shaft connected to the steering wheel; a second resolver of the pole pair number â€˜nâ€™, for detecting a rotating angle of the steering shaft through a torsion bar; a motor for assisting a steering operation of the steering mechanism connected to the steering shaft; a torsion calculating means for calculating the torsion angle of the torsion bar from a difference between the rotating angle detected by the first resolver and the rotating angle detected by the second resolver; and a motor controlling means for controlling the motor on the basis of an assist amount derived from the calculated torsion angle; wherein the torsion calculating means includes a table, for obtaining the compensation value in accordance with the value calculated by multiplying an electrical angle of the first resolver by â€˜nâ€™ and the value calculated by multiplying an electrical angle of the second resolver by â€˜mâ€™.