A Two-stage Kalman Filter for Sensorless Direct Torque Controlled PM Synchronous Motor Drive

Abstract EN

This paper presents an optimal two-stage extended Kalman filter (OTSEKF) for closed-loop flux, torque, and speed estimation of a permanent magnet synchronous motor (PMSM) to achieve sensorless DTC-SVPWM operation of drive system.

The novel observer is obtained by using the same transformation as in a linear Kalman observer, which is proposed by C.-S.

Hsieh and F.-C.

Chen in 1999.

The OTSEKF is an effective implementation of the extended Kalman filter (EKF) and provides a recursive optimum state estimation for PMSMs using terminal signals that may be polluted by noise.

Compared to a conventional EKF, the OTSEKF reduces the number of arithmetic operations.

Simulation and experimental results verify the effectiveness of the proposed OTSEKF observer for DTC of PMSMs.