A Hall Sensor-Based Position Estimation Method for PMLSM with an Improved Phase Locked Loop
Mingyi Wang, Yujie Niu, Yongbin Tang, Rui Yang, Chengbao Zhong, Liyi Li · 2019
In this paper, a novel position estimation method for permanent magnet linear synchronous motor (PMLSM) based on linear Hall sensor is proposed. Firstly, two linear Hall sensors are utilized to detect the magnet field density. However, the output signals of the sensors contain a large number of harmonics (including DC Offset). So, an improved phase locked loop (PLL) is presented to estimate the motor position. And the mechanism why this method can eliminate the influence of the DC offset and harmonics is derived. The simulation results validate the effectiveness of the proposed method.