Multimodal Design Optimization of V-Shaped Magnet IPM Synchronous Machines

An algorithm is developed for multimodal design optimization of a V-shaped magnet interior permanent magnet synchronous machine (IPMSM). This algorithm is capable of finding all the local and global minima of a given single- or multi-objective function. The paper demonstrates the algorithm to minimize the total active weight of an IPMSM while minimizing its losses considering mechanical, thermal, and magnetic constraints. Predicted operating characteristics of a preliminary, nonoptimized IPMSM are compared with the global and local optimal solutions obtained. The proposed algorithm provides the designer with a complete view of alternative optimal machine designs from which a suitable design may be selected. The close agreement between the simulation and experimental results for the globally optimized IPMSM design verifies the accuracy of the optimization approach.