| This project was granted by the project of the National Natural Science Foundation of China. (Contract No: 50745039 and 50975136).Ultrasonic motor (USM) is a novel motor utilizing the mechanical vibration in the ultrasonic frequency scale that is generated by the converse piezoelectric effect of piezoelectric ceramics. Compared with traditional electromagnetic motor, it posses a lot of merits such as fast response, directly-driving without reducer, high orientation precision, low speed and big torque, locking itself without electricity, free of magnetic interference etc, which bring it wide application in precision drving and so on. Since output force by friction interface, it's very important to do research on the friction-wear characteristic of the contact face of stator and rotor for USM. The main accomplished work is as follows:1. A lot of studies on friction-wear characteristic of stator and rotor for USM, which were investigated at home and abroad, were analysed. According to the foundation of friction and wear theory for USM isn't optimize, and especially there wasn't a set of testing method and experimental device for theory study, the task of the project was proposed.2. According to the mechanism of relative motion between stator and rotor for traveling type ultrasonic motor, a design scheme of friction-wear experimental device to simulate the contact situation between stator and rotor was proposed.3. A friction-wear experimental device for wear experiment of ultrasonic motor was developed, design of which includes mechanical and driving control. The device was controlled and monitored by computer with serial communication4. A design scheme for measuring and controlling system of friction-wear experimental device based on ADLink DAQ2206 was proposed. With LabVIEW programmed, controlling and monitoring of more links for this device will be accomplished.5. The wear experiment was carried on, and variation law of wear loss changed with pre-load, speed and mirco-vibration was studied. Surface roughness and fractal dimension of friction material were investigated, and change trend of the surface characteristics under the experiment situation was analyzed. Simulating the surface of friction material by fractal geometry was proposed. |
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