Research on Degradation Characteristics of Ultrasonic Motors Based on Accelerated Storage Test

Abstract

This paper mainly uses the method of load spectrum compression to equivalently compress the long-term storage time of ultrasonic motors. According to the Arrhenius model and N-L model, the motor’s 18-year storage life is compressed into 18 environmental test profiles. Then, a test system was built to conduct critical performance testing at different time points during the test process. The measured impedance frequency response data, starting torque and locked torque were statistically analyzed. It was found that the resonant frequency of the ultrasonic motor gradually decreased with the prolongation of the storage test time; the starting torque increased gradually with the prolongation of the storage time; and the locked torque showed no obvious regularity with time. The reasons for these characteristics were briefly analyzed, providing reference data for the design improvement of ultrasonic motors.