A computational-analytical approach to efficiently locate optimum objective spaces of permanent magnet motors in transient, rated and flux weakening operations

In this study, an efficient approach which explores and finds the location of the optimum objective spaces of an interior permanent magnet motor in the transient, rated and flux weakening operations is proposed. The permanent magnet flux linkage and the saliency ratio are analytically formulated as the functions of the motor dimensions by means of the magnetic equivalent circuit theory and used to identify the best operating regions of the starting torque, the rated efficiency and the characteristic current. It is shown that the mentioned objectives possess a pretty smooth and monotonic variation if they are expressed versus the flux linkage and the saliency ratio. Therefore, the optimum pareto fronts could be efficiently identified. The proposed method provides a very significant improvement for accelerating performance of optimizations since the computation-based constraint handling process is replaced by an analytical alternative.