Pseudo Sensorless Deadbeat Predictive Current Control for PMSM Drives With Hall-Effect Sensors

Abstract

Due to low cost and high reliability, the Hall-effect sensor is adopted as an alternative to the encoder. This paper presents a pseudo sensorless deadbeat predictive current control (PSDBPCC) method to improve the estimation accuracy of the rotor speed and position with Hall-effect sensors. In this method the output signals of the Hall-effect sensors are transformed to the Hall vector which contains high order harmonics by Clark transformation. The adaptive vectorial filter (AVF) is introduced to extract the fundamental waves of the Hall vector. The rotor speed and position are estimated from the fundamental waves with an improved phase locked loop (PLL) structure. Compared with the conventional method, the proposed method has higher estimation accuracy in steady state and better dynamic tracking performance. The experimental results verify the effectiveness of the proposed method.