Contact Modeling and Performance Evaluation of a Radial Standing Wave Ultrasonic Motor

Abstract

The focus of this paper is to propose a contact model of a radial standing wave ultrasonic motor in order to evaluate the motor performance accurately. The contact behavior between the stator and rotor is characterized by test and a continuous contact on the contact interface is confirmed. A contact model describing the continuous contact is then developed with analytical method. The stator vibration, the force transmission between the stator and rotor, and the output of the motor are analyzed. The impacts of different vibration amplitudes and structural parameters on the performances of the motor are evaluated based on the proposed model. Finally, a test platform for measuring the performance of the motor is built and torque-speed curves of the motor under different voltages are measured. The accuracy of the contact model is verified by comparison between measurement and calculation results. The proposed model not only can be used for design and optimization of the radial standing wave ultrasonic motor but also offers insight into the contact mechanics of standing wave ultrasonic motors.

Ultrasonic Motors Structural Design and Tribological Performance -A Review

“…Jiang and his research team assessed the impacts of different vibration amplitudes and structural parameters on the operations of a radial standing-wave ultrasonic motor. An analytical contact model was developed and the contact behaviour between the stator and rotor was characterized by test [4]. Equations ( 7) and ( 8) were used to determine the driving force and the blocking force of the leaf spring on the rotor.…”

“…Jiang et al [4] developed a test platform to measure the torque-speed curve of a radial ultrasonic motor with a stationary wave to validate the proposed contact model. The test platform includes an ultrasonic motor, hysteresis brake (EBU0.3L, ZF Friedrichshafen AG, Germany), torque transducer (T20WN, HBM GmbH, Germany) and shaft couplings.…”

“…Due to the diverse types of ultrasonic motors, there is currently no unified classification method. According to the principle of vibration of an ultrasonic motor, it can also be divided into a travelling wave type and a standing wave type [2][3][4]. The actuation type of ultrasonic motor is linear and rotary motion types [5,6].…”