Electromagnetic and Stress Performance Analysis for Synchronous Reluctance Motor Using a New Hybrid Subdomain Method

Various kinds of hybrid subdomain methods (HSDMs) and stress calculation approaches have been proven to be effective ways for magnetic and stress field prediction, respectively. However, there is no suitable approach to address this dual requirement during the design stage of the synchronous reluctance motor. To address mentioned difficulty, this work proposes a new HSDM (NHSDM) integrating the improved finite difference method (IFDM), subdomain method, and equivalent magnetic network (EMN). The key of the proposed NHSDM has three parts. First, the IFDM eliminates the complexity of the inner interface condition, thereby enhancing the convenience of the programming process. Second, the IFDM and EMN are synergistically integrated to fully account for the core saturation effects in both stator and rotor. Finally, the proposed NHSDM can offer an ability to accurately and efficiently predict the magnetic and stress performance in both steady and dynamic stages for the first time. Reliability and feasibility of the proposed NHSDM are verified via finite element analysis and prototype testing. All comparative analyses indicate that the proposed NHSDM can swiftly and precisely predict the magnetic field and stress distribution during both steady and dynamic stages.