Research Of The Passive Clamp Type Cylindrical Inchworm-type Piezoelectric Linear Motor

Inchworm-type piezoelectric linear motor, designed on the basis of the principle of reptiles inchworm crawling, is due to the characteristics of compact structure, large displacement and high resolution, which makes its incomparable advantages compared with rotary motor. It can effectively control the shape and position and suppress vibration, therefore, it has a broad application prospect in the fields of the structure of adaptive systems, automotive, aerospace, precision instruments and so on. The purpose of this paper is to design a kind of passive clamp type cylindrical inchworm-type piezoelectric linear motor, which will be applied to the slender compact precision driving and positioning in the occasions of small space, and experiments on the performance of the motor. The main research work of this paper is as follows.A new structure of passive clamp type inchworm-type piezoelectric linear motor is put forward, which includes three main friction mechanisms:a drive mechanism and two clamping mechanism. The composition, design principle, working mechanism, selection of size and material of the clamping mechanism, flexible mechanism, drive mechanism and preloaded and positioning mechanism is discussed in detail in this paper. The piezoelectric piles adopted in each institution are selected and the influencing factors in the motor design are analyzed.This paper puts forward requirements of the structure of the proposed motor. Finite element analysis software ANSYS is used to analyzed the performance of the drive mechanism and the clamping mechanism, optimizing the motor function of each part size. The triangle amplification principle is used in the design of the flexible structure, on which a kinematical analysis is carried out. The displacement triangle magnification of the flexible mechanisms is obtained, a surplus quantity of the clamping mechanism is determined.A principle prototype is successfully processing out. This paper has selected the control scheme of the motor and has completed the full test of the clamping performance, driving performance and the whole machine performance of the motor. The paper implements the peristalsis movement of the motor, validates the correctness of theoretical design and simulation results, and analyzes the reason for the difference between the theory and experiment. Test results show that the static friction force is5N, maximum displacement resolution is0.05μm, displacement triangle magnification is greater than4with a good consistency, and maximum driving speed reaches364μm/s.