Speed Response Improvement Design of Electric Motor for Vehicle Electrification Based on Electro-Mechanical Analytic Model

According to vehicle electrification trends, the application of electric motors more often occurs. Therefore, in the aspect of the supply instability preparation for rare-earth materials, research on the rare-earth-free motor is getting more attention. Moreover, the electric motor for the vehicles should have not only high power density but also fast response. Especially, electric motors for advanced driver assistant systems or autonomous driving vehicles should have a fast response speed to secure the driver's safety. This paper introduces the electro-mechanical response improvement design of concentrated flux synchronous motors for vehicle electrification. Improvement design is carried out targeting motors for electric power steering system. The development of the electro-mechanical analytic (EMA) model of the electric motor is firstly explained. Then, based on the developed EMA model, electro-mechanical response modeling is performed. Finally, the speed response improvement design is conducted using the developed EMA model. In addition, the results are validated not only in finite element analysis but also experimentally.