Investigation of Sensorless Control of Permanent Magnet Synchronous Motor Using High Frequency Injection
Abstract: This thesis implements and analyses a sensorless control method for permanent magnet synchronous motors. The purpose is to investigate if the results presented in a study performed by Millinger et al. can be replicated on an industrial grade embedded control system. The sensorless control method uses a high frequency signal injection to estimate the rotor position. The rotor is modified with copper plates in order to increase the inductance variation and the modified motor shows a 45% inductance variation. The sensorless control algorithm is implemented on an embedded control system designed for use in one of Atlas Copco’s handheld battery tools. The control system is modified by the removal of an analogue filter. The results show that the position and speed estimation is accurate enough to enable speed control for high and low speeds but the results from Millinger’s study has not been replicated.
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