EV drive efficiency of traction motor considering regenerative braking according to various motor cores

Abstract

Purpose The purpose of this paper is to study the electric vehicle (EV) drive efficiency of a traction motor considering regenerative braking according to various motor cores. Design/methodology/approach A software program was developed to predict the driving performance of an EV. It determines the driving mileage, the required power of the traction motor, and the operation points on a torque-speed map when drive cycles are given. The driving performance is calculated from the battery capacity, vehicle specification, and efficiency map of the traction motor computed using the finite element analysis. Findings As a result, the motor core is a significant design variable for raising the driving mileage of an EV. It is noted that the change of electrical steels used for the motor core is the lowest priced method of increasing the driving range by 2 km. Originality/value The comparative analysis of motor core by replacing 35PN250 to 25PNX1250F results in improvement effects traveling 4.62 and 5.16 km farther in the Simplified Federal Urban Driving Schedule (SFUDS) and Highway Fuel Economy Driving Schedule (HWFET), respectively. It was also verified that regenerative braking system is able to enhance drive efficiency by 29-31.3 km in the SFUDS and 6.5-7.3 km in the HWFET. From comparison of price rise for increasing driving mileage by 2 km, it is noted that the change of electrical steels used for the motor core is the lowest priced method.

Iron loss research of amorphous alloy motor by considering the influences of solidifying and annealing on stator core

“…People's pursuit of permanent magnet motors with higher efficiency, torque density and power density never stops (Kruchinina et al, 2017;Liang et al, 2016;Liu et al, 2016). With the development of material science and technology, one effective way to achieve this goal is to replace the silicon steel (SS) cores with higher-grade materials (Shim et al, 2016), such as amorphous alloy (AA) material (Silveyra et al, 2016;Hong et al, 2013). The iron loss may reduce if AA is used as the core material instead of SS (Fan et al, 2014;Dems and Komeza, 2014), but one drawback of AA is that the loss characteristics will be significantly influenced by the manufacturing stresses.…”