Performance improvement of IPM motors by change of rotor shapes-application to electric vehicles

Abstract

This paper has investigated the IPM motor from the Tesla rear-drive motor, with the single drive system delivers of 200 kW-450 Nm. This research concentrates on analyzing and evaluating the performances of the electric motor. Both the public data and improved simulation have been used to analyze and compare with the current version. The detailed improvement designs of double V and inverter delta have been implemented for the high constant torque in a wide range speed of electric motor applications. The torque density, torque ripple, and output power are studied by using the finite element method with different structures. In practice, electromagnetic designs of two-layered rotor structures with types of double V and VI magnets are the best choices because this is a simple structure for manufacturing in mass production. For higher torque density and efficiency, the two-layered double V or VI magnets can adjust the sinusoidal step skewing to minimize harmonic components of the torque ripple and back electromotive force.