Efficiency improvement and downsizing of double-layered IPMSMs containing a strong magnet for automotive applications

Interior permanent magnet synchronous motors (IPMSMs) are currently widely utilized as traction motors. The permanent magnets used in IPMSMs are an important factor; thus, high-coercivity permanent magnets with lesser rare-earth elements are in development. This paper proposes two modified versions of double-layered IPMSMs containing a strong magnet to improve their efficiency and reduce their size. The performance of these IPMSMs is demonstrated in several scenarios and discussed based on the results of two-dimensional finite element analysis.