Design Optimization of Permanent Magnet

Abstract

A multilevel ant algorithm is developed to optimize the design process of a surface mounted permanent magnet synchronous motor. The motor properties are calculated using an exact magnetic equivalent circuit based analytical model. This model takes into account the iron saturation, the slot stray fluxes and the spatial harmonics of rotor and stator fluxes. The effectiveness of the proposed analytical model is verified in comparison with measurement of a handmade prototype. Based on this analytical model the air gap flux density, torque and induced voltage of the prototype motor are predicted. For an effective selection of motor parameters, a multipurpose optimization algorithm is developed, which is based on the distributed multilevel ant-stigmergy algorithm. The analytical model together with the optimization algorithm represents a very effective tool for design of permanent magnet synchronous motor without any need for time consuming finite element programs.