A Study on the Suitability of High Space Factor Wire for Traction Motors

Recently, the method of designing motors according to the high voltages of vehicle systems has been reestablished; in the case of traction motors for electric vehicles (EVs), which are large devices, hairpin winding structures have been increasingly adopted for improved outputs and efficiencies. However, for hairpin windings, significant AC losses can occur in EV systems requiring high driving speeds, thereby decreasing the efficiencies in high-speed operation regions. Therefore, this study designs a motor that uses a round wire winding and a hairpin winding under the same vehicle system conditions and analyzes the suitability of the hairpin structure for application to an EV traction motor under the current vehicle system condition.