운전사이클을 고려한 전기자동차용 권선절체모터의 권선수 최적화 연구

Abstract

Driving cycles are used to test the fuel economy and driving range of the electric vehicle propulsion motor and inverter on dynamometer. For a longer driving range, the propulsion motor and inverter need high efficiency at the driving cycle’s frequent speed and torque points. In this paper, tap-change PMSM (Permanent Magent Synchronous Motor) is studied as an electric vehicle propulsion motor for a better efficiency with two driving cycles: UDDS and HWFET. They have different high energy demand drive speeds which are 3krpm and 7krpm. With energized stator winding selection, tap-change motor high efficient regions can be adjusted to the each high energy demand drive points of UDDS and HWFET. Thus the designed tap-changes PMSM winding turn numbers are selected to minimize the motor copper loss and inverter loss at both driving cycles high energy demand drive speeds. The designed tap-change motor is implemented by rewinding a mass produced PMSM for a electric vehicle. By comparison experimental results of the motor and inverter loss with the mass produced PMSM, the designed tap-change one has a 1.63% energy efficiency improvement according to combined driving cycles.