Analytical Approach to Estimate Torque Characterization of Synchronous Motors Assisted by FEA

This paper is to develop a generalized estimation method of per-unit torque for synchronous motors which includes synchronous reluctance motor (SynRM) and interior permanent magnet synchronous motor (IPMSM). The torque estimation method is based on Lorentz force which is yielded by air gap flux density to let the torque generating mechanism be more intuitive. Moreover, a permanent magnet-assisted synchronous reluctance motor (PMASynRM) with ferrite permanent magnet (PM) was designed by finite element analysis (FEA) software, Maxwell 2D. Moreover, in order to verify the merits of the proposed design motor, the rated power, output torque, and power factor are compared to those of ABB SynRM with similar stator outer diameter and rated power. Finally, the estimated method of per-unit torque is verified by simulation results, and the developed PMASynRM was tested to show the better performance than benchmark motor, which indicates the effectiveness of the proposed design.