Patent Document ID: 8898030
Application ID: 13274701
Patent Flag: 1

Claim One:
1. An apparatus for adaptively compensating a position error of a resolver, the apparatus comprising: a position error estimator configured to receive position information of a rotor of a motor, which is detected by the resolver, from a resolver-digital converter wherein the resolver-digital converter is configured to digitalize the position information and adaptively estimate a position error included in the position information, wherein the position error estimator comprises: a speed ripple estimation section configured to acquire a speed ripple by subtracting an ideal speed from a value obtained by differentiating the position information, wherein the ideal speed is obtained by removing a frequency component of a ripple caused by the position error from the value obtained by differentiating the position information; a parameter estimation section configured to apply a recursive least square method to a regression equation including the speed ripple, the position information, and the ideal speed, and estimate unknown parameters contained in the regression equation; and a position error modeling section configured to create a position error model equation by using the estimated unknown parameters and the position information, and estimate the position error from the position error model equation; and a position error compensator configured to subtract the estimated position error from the position information, and calculate compensated position information.