| Summary: | The main objective of this thesis was to investigate the effect of phase parameter asymmetries on the torque of a 3-phase Permanent Magnet (PM) synchronous motor, and to identify an optimal control strategy that minimizes the torque and speed ripple by modifying the standard vector control scheme. The study was carried out in three stages. The first stage involved the development of a mathematical model for simulation of phase parameter asymmetries. In the second stage, the torque and speed ripple were analysed in two ways. Firstly, the analysis was done in an open-loop system, i.e., without position- feedback phase 'commutation and secondly in closed-loop system, i.e., with vector control. The last stage involved the minimization of the ripple through a vector control strategy. F or experimental purposes, the asymmetries were artificially introduced in the available PM synchronous motor by attaching an external impedance between two supply lines. Such a combination emulated an asymmetrical motor and allowed changes in the level of asymmetries.
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