| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that since the actual angle is predicted from the average value of angular changes of a resolver during one revolution, a deviation may occur between the actual angle and the prediction value when the number of revolutions of the resolver is not constant during one revolution, and correction is not performed appropriately.SOLUTION: An elimination frequency variable notch filter unit 301 has a notch filter function for reducing only the signal of a specific elimination frequency band, and passing signals of other frequency. The resolver rotation frequency after filtering ωrslv_flt from which the error is reduced is subtracted from the resolver rotation frequency ωrslv containing an error, and the result is inputted to an integration unit 304. The integration value is cleared to 0 upon generation of a reference angle signal Ref&thetas;. An angle correction value creation unit 305 makes an angular error, i.e., the integration result, correspond to the value of resolver detection angle &thetas;sns, and outputs as an angle correction value &thetas;crrct for the resolver detection angle &thetas;sns. |
