Study on SVM-DTC and sensorless technique in long primary segmented permanent magnet linear synchronous motor

The thesis systematically researches electromagnetism and mechanical characteristic of primary segmented permanent magnet linear synchronous motor (PS-PMLSM), and discusses the varying rules of coupling flux linkage and inductance of each stator segment. The paper propose the space vector modulation direct thrust control (SVM-DTC) algorithm that based on thrust and flux observer, but also analyzes and builds adaptive slide mode observer(SMO), which adopts multisegment estimate back-EMF combined method and phase-locked loops (PLL) to estimate the position and speed of mover. Owing to the methods above, they are able to efficiently solve application problems in PS-PMLSM, which can't be settled through the conventional SVM-DTC and sensorless controlling method. Finally, the effectiveness of the algorithms is verified by simulation test.