電流源供電之永磁同步馬達無位置感測控制

Abstract

本文描述以電流源供電之永磁同步馬達驅動的策略，是使用降壓型直流直流轉換器取代理想電流源，再接上三相變頻器以驅動馬達。由於所使用之永磁同步馬達須以霍爾元件感測轉子的位置，但是在許多環境下，無法準確使用霍爾元件進行位置感測，於是本文提出無位置感測控制策略，以端電壓偵測電路偵測端電壓之交會點為基礎。利用交會點來得到準確的開關換相點，進而達到驅動與控制的目的。最後利用模擬與實作結果來驗證所提無位置感測控制策略。

In the thesis, current-source-inverter(CSI)-fed PMSM drive is studied. The current source inverter is obtained by step-down dc-dc and six-switch inverter. In PMSM drive, rotor position should be sensed to provide adequate commutation signals. In this thesis, position sensorless control is proposed, and it is based on the motor terminal voltages. Simulation and experimental results are also provided to demonstrate the validity of the proposed CSI-fed sensorless control.