The Optimization Of Flexible Clamp Design For Small U-type Linear Ultrasonic Motor

Linear ultrasonic motor (LUSM) has many advantages such as no electromagnetic interference,self-locking, high resolution of displacement and so on. There are broad prospects of the LUSM in thefield of aerospace, biomedical engineering, nanotechnology and precision instrument.Miniaturization is an important development of the LUSM, tending to replace electromagneticmotor especially in micro precision position. Through the optimization of structure design and flexibleclamp, this paper designed three types of flexible clamp for the small U-type linear ultrasonic motor.The main content of research is showed as below:1) The beryllium-bronze (QBe) is used as elastomer material instead of steel, to improve frictioncharacteristics and anti-relaxation of the motor in this paper. Based on APDL, the frequencyconsistency gets improved through the structure optimization of new parameter.2) Through theoretical calculation, the position of clamping is advised to set at the section oflongitudinal modal or maximum amplitude of bending vibration. While the transverse and torsionalstiffness should be as large as possible, to improve the output force and structural stability. This paperalso established the mechanical modeling of the arc-shaped and straight type flexible clamp.3) Three kinds of flexible clamp are designed to support the calculation modal above. Bymeasuring the real-time displacement of the motors in different frequency and different pre-load, themaximum thrust and velocity can be achieved. The maximum thrust reaches18N. Besides, thesmallest step of the linear ultrasonic motor based on straight type flexible clamping is measured inthis paper.