The main purpose of the EPS switching power supply aging test is to prevent the winding from being damaged, and whether the important performance (power) of the dynamometer is qualified. The performance of the motor is gradually disappeared. These materials are gradually aging due to the mechanical operation of the motor, which is to test whether the important performance (power) is qualified. The purpose of the test is very obvious. The insulation structure is composed of many insulating materials (both organic and inorganic), so the aging test must be performed.