Electric power steering apparatus and angle compensating method therefor

摘要

An electric power steering apparatus (20) includes a first resolver (35) whose pole pair number is 'm' and a second resolver (37) whose pole pair 'n'. The electric power steering apparatus (20) further includes a torsion calculating means (60) which calculates the a torsion angle ( DELTA &thetas;) of the torsion bar (31) from a difference between the rotating angle (&thetas;e1) detected by the first resolver (35) and the rotating angle (&thetas;e2) detected by the second resolver (37). The torsion calculating means compensates the angle difference by a compensation value ( beta ) obtained by a table on the basis of the value obtained by multiplying an electrical angel (&thetas;e1) of the first resolver (35) by 'n' and the value obtained by multiplying an electrical angle (&thetas;e2) of the second resolver (37) by 'm'. <IMAGE>