Qu Jianjun, Zhou Tieying
Department of Mechanical Engineering, Harbin Institute of Technology, PO Box 424, Harbin 150001, China.
Ultrasonics. 2003 Sep;41(7):561-7. doi: 10.1016/s0041-624x(03)00152-5.
Performances of ultrasonic motor (USM) depend considerably on contact state between stator and rotor. To measure the contact state in a traveling wave ultrasonic motor (TWUSM), a special test method is necessary. This paper develops a new method named electric contact method to measure contact state of stator and rotor in traveling wave type USM. The effects of pre-load and exciting voltage (amplitude) of stator on contact state between stator and rotor are studied with this method. By a simulating tester of friction properties of TWUSM, the variations of stalling torque and no-load speed against the pre-load and the exciting voltage have been measured. The relative contact length that describes the contact characteristic of stator and rotor is proposed. The relation between the properties of TWUSM and the contact state of stator and rotor are presented. Additionally, according to a theoretical contact model of stator and rotor in TWUSM, the contact lengths at given conditions are calculated and compared with the experimental results.
超声波电机（USM）的性能在很大程度上取决于定子和转子之间的接触状态。为了测量行波超声波电机（TWUSM）中的接触状态，需要一种特殊的测试方法。本文提出了一种名为电接触法的新方法，用于测量行波型超声波电机中定子和转子的接触状态。利用该方法研究了定子的预紧力和激励电压（幅值）对定子与转子之间接触状态的影响。通过行波超声波电机摩擦特性模拟测试仪，测量了堵转转矩和空载转速随预紧力和激励电压的变化。提出了描述定子和转子接触特性的相对接触长度。给出了行波超声波电机性能与定子和转子接触状态之间的关系。此外，根据行波超声波电机定子和转子的理论接触模型，计算了给定条件下的接触长度，并与实验结果进行了比较。
