Sensorless flux vector control for a permanent magnet synchronous machine with cylindrical rotor under severe starting conditions.

摘要

This thesis is concerned with determining a sensorless, method for the closed-loop, controlled torque start-up of a cylindrical Permanent Magnet Synchronous Machine (cylindrical PMSM).; This work will concentrate on the study of sensorless operation of a cylindrical PMSM, assuming a typical design with surface mounted Ne-Fe-B permanent magnets. Sensorless operation at low speed and start-up against high torque presents several problems which have to be solved for an operational drive. The position at standstill has to be identified. This is required to start-up with optimal torque at a minimum motor current, thereby minimizing the inverter current rating.; A method to identify the standstill position for cylindrical PMSM machines assuming ideal cylindrical behavior (Xd = Xq) is proposed. Furthermore, closed-loop controlled torque start-up is proposed using a structured adaptive flux observer, which allows the start-up with the optimal high torque in severe starting conditions with the least possible motor current. (Abstract shortened by UMI.)