Thermal capability of electric vehicle PMSM with different slot areas via thermal network analysis

In this paper, the effect that a varied stator slot size has on efficiency and thermal capability of permanent magnet synchronous machine for an electric vehicle, is evaluated quantified. A with four differently sized areas was electromagnetically finite element analysis, thermally lumped parameter network model. By decreasing while keeping other dimensions fixed, core losses reduce due to wider magnetic path, whereas winding increase. Additionally, higher maximum torque reached reduced saturation. Results are compared in machine’s torque-speed operating area regarding machine-part total losses, continuous transient overload capability, as well during 19 low, middle high-speed drive cycles energy peak temperature. The largest showed lowest thus highest limited capability. contrast, were 13 cycles, 11 them smallest its lower part load (i.e. core) losses. would also result material cost since it least copper.