超声驱动的超声波振动减摩作用研究

借助于动力学原理,对超声驱动中的垂直超声波振动的减摩作用进行了理论研究。将超声电机定子和转子接触区定子表面一点的超声波振动分解成水平振动和垂直振动,并分析了两个方向振动对超声电机驱动作用的影响。提出水平振动产生摩擦驱动力,垂直振动影响水平驱动的效果,将垂直方向超声波振动的作用等效为普通滑动试验中垂直于滑动方向超声波振动的作用,揭示了垂直方向超声波振动是导致超声驱动动摩擦系数降低的原因。试验结果与理论分析定性地一致。

Study on antifriction effect of ultrasonic vibration in ultrasonic driving

This paper describes a theoretical study, using dynamic principle, about the influence of the ultrasonic vibration on the frictional properties of ultrasonic driving. Ultrasonic vibration of stator surface points at the contact region of stator and rotor in ultrasonic motor(USM) is resolved into horizontal and vertical vibration and the effects of two direction vibration on USM driving are analyzed. It is proposed that the horizontal vibration produces friction driving force and vertical vibration affects horizontal driving effect. The role of vertical ultrasonic vibration of stator surface points in USM is equivalent to the role of ultrasonic vibration being perpendicular to sliding direction in common sliding test. The reasons are revealed that the vertical ultrasonic vibration results in decrease of sliding friction coefficient in ultrasonic driving. An experiment is performed to verify the anti-friction effect of vertical ultrasonic vibration.Experimental results show reasonable correlation betw een theory and experiments.