A Study on the Electrical Characteristics by Accelerating Degradation for Traction Motor in Urban Transit EMU

전동차용 견인전동기의 가속열화에 의한 전기적 특성 연구

Insulation system(200 class} for stator coil is designed for traction motor with VVVF inverter. Sample coils for stator of the traction motor were tested by accelerative thermal degradation which composed of heat, vibration, moisture, and overvoltage apply. Reliability and expected life were evaluated on the insulation system for 200 class traction motor. After aging of 10 cycles, tan ${\delta}$ increased with voltage. This result is due to increase of internal defects and change of insulation structure.