The outputs of resolvers are amplitude modulated signals,one with the sine and the other with the cosine of angular position. In order to obtain the rotor angular position and velocity information,detection and demodulation are required. However,detection results often contain dc offsets,amplitude deviation and non-orthogonal phase shift. To enhance demodulation accuracy,a calibration procedure is necessary before demodulation. An offline automatic calibration method was introduced to meet this need. A stat...