Self-calibration and noise reduction of resolver sensor in servo drive application

Resolver sensor is utilized as absolute position transducer in many industrial motion-control applications where robustness and ability to operate in harsh environment is required. In real system, the quality of position and speed measurement is badly affected by the resolver errors and by the noise. In this paper, the software-based error-compensation technique is integrated into the control structure of the drive. The compensation scheme adapts online to the errors in the resolver signals in order to improve accuracy of the measured position and speed. Oversampling and averaging technique is used to reduce noise and improve resolution. The performance of the compensation scheme and the effect on the drive operation is verified by simulation.