Mechanism And Experimental Research On Rectangular Plate Type Spherical Piezoelectric Ultrasonic Motor

Ultrasonic motor is not only compact, small size, light weight, it also has low output torque, the static to maintain torque, no electromagnetic interference and other characteristics; so as a small precision mechanical drive, in recent years by domestic outside the researcher attention.Rectangular plate is the use of spherical ultrasonic motor has a simple structure, the characteristics of piezoelectric elements in various forms, can be developed to achieve multi-dimensional movement driving mechanism; because of its simple structure, can achieve multi-dimensional motion control, so the robot joint drive, etc. agency has good application prospects.In this paper, rectangular plates with spherical ultrasonic motor for the study, the use of part of the stator and rotor contact with the formation of elliptical motion, this movement can push the rotor through friction movement principle, on the rectangular plate spherical ultrasonic motor were studied. Course of the study focused on the mechanism of the motor, model simulation analysis, design, performance testing system and the parameter analysis and other aspects of the work.1. Piezoelectric ultrasonic motor research and developmentThis article focuses on the ultrasonic motor of domestic and foreign situation and developing trend of piezoelectric ultrasonic motor of history is longer, the results are many, are broadly representative of a single degree of freedom linear piezoelectric motor, and more Degree of freedom spherical ultrasonic motor. MDOF ultrasonic motor has a broader application space, in recent years, the research focus of piezoelectric ultrasonic motor. Recent advent of spherical ultrasonic motor are Fangding Zi type, cylindrical stator, as well as to study this rectangular plate stator and so are many.2. Piezoelectric properties of the materials analysisAccording to piezoelectric theory, the piezoelectric ceramic used in the motor performance parameters and technical characteristics, performance parameters include electromechanical coupling coefficient, and mechanical quality factor. Rectangular plate piezoelectric ultrasonic motor based on piezoelectric ceramic mechanical deformation and the requirements of motor resonance, select pzt-4 as the core of the motor drive components, which laid the foundation of the rectangular plate spherical ultrasonic motor based on the theoretical study.3. Rectangular plate piezoelectric ultrasonic motor Spherical MechanismAnalysis of rectangular plates spherical ultrasonic motor works, motor sport's condition is the formation of the bulge at the top of the motor produces elliptical motion; studied the conditions and the formation of elliptical motion of elliptical motion of the conditions vibration mode analysis of two species to form elliptical motion of the vibration mode B32, B23; have also introduced "elliptical motion" of the drive signal-a standing wave. According to vibration theory, the use of function combination method, the apparent elasticity method formula for rectangular plates rectangular spherical ultrasonic motor the stator plate is calculated and analyzed, the establishment of the Mada Zhen Oscillation mechanics model to determine the vibration frequency of the motor Scope and raised position and dimensions.4. Rectangular plate piezoelectric ultrasonic motor and the spherical modal simulationANSYS 10.0 finite element rectangular plate with the motor stator with piezoelectric vibrator for vibration mode simulation. Analysis process is to create spherical rectangular plate piezoelectric vibrator piezoelectric ultrasonic motor finite element model; analysis of rectangular plates with rectangular spherical ultrasonic motor's vibration modes of the stator plate; on the piezoelectric vibrator of the bulge, the substrate, the vibration of piezoelectric ceramic modal simulation analysis, the piezoelectric vibrator ideal B32, B23 modal frequency, the structure size; and the overall structure of the piezoelectric vibrator is simulated.5. Rectangular plate piezoelectric ultrasonic motorSpherical design of the rectangular plate piezoelectric ultrasonic motor prototype; and for the rectangular plate spherical ultrasonic motor prototype test system was designed; of spherical ultrasonic motor rectangular plate motion parameters were measured; on the measured parameters were analyzed, drawing curve of each parameter; studied the effects of spherical rectangular plate piezoelectric ultrasonic motor movement factor.