Conference: The 37th International Electric Vehicle Symposium & Exhibition (EVS37)
Authors: Seung-Hun Lee, So-Yeon Im, Myung-Seop Lim
DOI:
As the importance of environmental protection increases along with fuel regulations, the paradigm of the automotive industry is changing due to the electrification of a vehicle system. A fuel cell electric vehicle (FCEV), a clean technology among electric vehicles, consists of a traction motor that replaces an engine and a fuel and air processing system (APS) for supplying electric energy to the motor. To achieve the high-power densities needed for FCEVs, the specifications of the APS with air compressor increases significantly. As shown in Figure1, the air compressor is a core part of the FCEV. A high-speed (HS) surface-mounted permanent-magnet synchronous motor (SPMSM) driving air compressor supplies high pressure and a high flow of oxygen to the fuel cell stack. Since HS SPMSM has large electromagnetic losses (such as ac copper loss, rotor eddy current loss, and iron loss) because of high rotational speed. In addition, most permanent magnet synchronous motors (PMSMs) have a three-phase stator coil supplied by a pulse-width modulation (PWM) controlled motor driver. In addition to the current contributing to the torque, the inverter switching causes harmonic currents to be applied, resulting in additional electromagnetic losses.