Inductance Analysis of Two-Phase Slotless Tubular Permanent Magnet Synchronous Linear Motor
Zhang Chunlei1,2, Zhang Hui1,2, Ye Peiqing1,2, Zhang Luhong1,2
1. Department of Mechanical Engineering Tsinghua University Beijing 100084 China; 2. Beijing Key Laboratory of Precision/Ultra-Precision Manufacturing Equipments and Control Tsinghua University Beijing 100084 China
Abstract：The inductances of two-phase slotless tubular permanent magnet synchronous linear motor (TPMSLM) are affected by the disconnection of windings and the change of coupling length. This makes the inductance change complicated and difficult to implement sensorless control. Therefore, the inductance of TPMSLM needs to be accurately modeled. Firstly, the axial magnetomotive force function and the axial specific permeance function were utilized to derive the analytical model in the fully coupled state. Then the domain of the axial specific permeance function was extended and the inductance expression in the whole moving range was calculated. The expression was verified by finite element method. And the characteristics of the inductance and the influence of the coupling length were analyzed. Finally, the inductance of a prototype was measured and compared with the analytical result. The maximum error between the two results is 0.04mH, which proves the correctness of the analytical model.
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2021, Vol. 36 
