Abstract: A method includes receiving a sine feedback signal and a cosine feedback signal from a resolver coupled to an output shaft of an electric motor. Rectified sine and cosine signals are generated by sampling the feedback signals. A direction of rotation of the output shaft is determined using the feedback signals and the rectified signals. The rectified sine signal and the rectified cosine signal are converted into a signed sine signal and a signed cosine signal, respectively, using information associated with the direction of rotation. A speed of rotation of the output shaft is determined using the signed sine signal and the signed cosine signal. The direction and the speed of rotation are compared to a respective direction and a respective speed determined by a resolver-to-digital converter. The electric motor is operated based on the comparison.

Abstract: An example method includes: receiving a sine feedback signal and a cosine feedback signal from a resolver; generating a rectified sine signal and a rectified cosine signal; determining a direction of rotation of a shaft of an electric motor using the sine feedback signal, the cosine feedback signal, the rectified sine signal, and the rectified cosine signal; converting the rectified sine signal and the rectified cosine signal into a signed sine signal and a signed cosine signal, respectively, using information associated with determining the direction of rotation; determining a speed of rotation of the shaft using the signed sine signal and the signed cosine signal; comparing the direction and the speed of rotation to respective direction and respective speed of rotation determined by a resolver-to-digital converter; and operating the electric motor based on the comparing.