PMSM Sensorless Control with Coordinate Rotation Digital Computer

Abstract

Coordinate Rotation Digital Computer (CORDIC) is usually used to obtain the angle information without any multiply and division operations. The extended electromotive force (extended-EMF) in the literature shows that the angle error between the rotor reference frame and the assumed reference frame can be estimated from an arctangent function and a division. In this paper, the sensorless control for permanent-magnet synchronous motor (PMSM) is designed and implemented based on the CORDIC algorithm. Compared to the calculation of the arctangent function and division operation, CORDIC-based algorithm is able to save calculating time and memory resource. The provided simulation and experimental results also demonstrate the proposed CORDIC-based sensorless control.