Approach to speed control using temperature characteristics of ultrasonic motor

Abstract

Approach to speed control using temperature characteristics of ultrasonic motor ~~ 50 [Idlz] 1 10 [Vm,] 0.5 [kgf-cm] 1 .0 [W] 200 [rpml 1 .O [kgf-cm] 1 .O [kgf-cm] 263-328 IK1 Abstract-Ultrasonic motors have some special unique features, such as high-torque under low-speed operation, compact size, and no electromagnetic noise. Ultrasonic motors would be expected to apply an element of the artificial muscle. The driving principle of the ultrasonic motor is based on friction force between a rotor and a stator. Therefore, it is difficult to drive the ultrasonic motor at a constant speed, because the generation of heat by friction changes the friction force. In this study, we proposed speed controllers of the ultrasonic motor, considering the temperature rise of the ultrasonic motor. From the results, these methods were proved the most effective for the speed control of the ultrasonic motor in experiments.

Pre-Pressure Optimization for Ultrasonic Motors Based on Multi-Sensor Fusion

“…The energy losses occurring in the two processes not only reduce energy utilization but also significantly increase the internal temperature, which deteriorates TRUMs' performances. Previous authors have made several contributions [19,21] to compensate for the temperature rise to obtain a better speed control performance. However, few researchers have paid attention to the role of pre-pressure in the temperature variation.…”