The Low-Frequency Driving Mechanism And Experimental Research Of The Piezoelectric Motor

The low-frequency piezoelectric motor (i.e. low-frequency motor) is a new type of concept driver. The new piezoelectric driver compared to ultrasonic motor was conceived by the Piezoelectric research laboratory of Jilin University. That the same contact type ultrasonic is use of friction to driven rotor. USM (Ultrasonic Motor) is the apparatus that transfer mechanical vibration of piezoelectric vibrator to driving force by friction, so the Low-Frequency Motor is. USM is paid close attention recently because it has some special advantages such as high torque in low speed, ability to maintain its own position, faster response, simple structure, no danger of interference due to electromagnetic induction, and so on gets the domestic and foreign attention. For some reasons especial the Special-purpose power supply compared to ultrasonic motor itself more precious caused its application to come to certain limit.As the exclusive power defects ,low-frequency motors will replace high-frequency by low-frequency power supply even without special power supply and it can be directly used in the following applications driver.It is expected to further expand the scope of applicationThe fact that the ultrasonic motor (above 20Hz) and the piezoelectric feeder (below 300Hz) success application proved that the vibration can transform the driving force come through the appropriate frame. Using a group or more vibrations on an elastomer to synthesize or combined it can have the impetus object revolving ability by make them accord to a special kind of planned pattern vibration and form the superficial elliptic motion (or relative elliptic motion) thus the low-frequency vibration come into being driving force by making use of theappropriate structure. Because the piezoelectric vibrator operating frequency much more lower than the ultrasonic motor, therefore it s? keystone is how to solve the combination and the balance question which vibrates under the more complex structure conditions. There is no essential evidence prove that this project is not come into existence.In present ultrasonic motor have many kinds of ways to form the elliptic motion. Low-frequency motor may directly use or profit from majority of them. But the vibration frequency is so strong difference that there is many new questions need to solve.First the stator vibration surface must form the ellipse or the relative elliptic motion, the stator can impel the rotor to move ability based on it. Stator size is smaller (thinly) than USM so that it is sensitive to the external force and it is more difficult to continue to form the elliptic motion stably (or relative elliptic motion).Second vibrator must form low-frequency resonance because the resonance is the basis to sustained and stable low-frequency motors. In this paper, study and analysis the piezoelectric bimorph oscillator to facilitated the formation of resonance. The basic components include low-frequency motor stator (oscillator), installation and rotor components.As a machine, electricity,Interactive control system, the kinematics and dynamics is a very complex issue.The article research and have made two type of drivers through study USM and Piezoelectric Vibration Feeder, and tested the basic performance of the prototype.First in order to prove the low-frequency motor ( tilt vibration of low-frequency motor)was feasible and designed the first kind of structural style through copy piezoelectric vibration Feeder. For the initial exploration stage many aspects are not mature. It has not been able to reduce the frequency effectively, but it proved the feasibility of the low-frequency motor could form the driving ability. Based on normal school experiment theory, we establish three factors and two level experimental table. We can get the most excellent combination which effect the motor capability from the analysis of experiment results. Then we choose the mostexcellent combination to do single experiment and can get a series of connection curve between different factors,such as voltage and rotate speed, voltage and the output torque, frequency and rotate speed rates etc.In design and manufacture of Vertical vibration of low-frequency motor, though a certain degree of progress. It is still at the preliminary stage, frequency, speed, the output torque and so on had not been able to better control, but also provided experience and the lessons for the future development of low-frequency motor . Using the FEM to the piezoelectric vibrator of the vertical vibration of low-frequency motor obtained the first to fifths step vibration model and analyzed the first step model is adapt to the low-frequency motor in the vibration. Carried on the modality analysis to the overall prototype, the analysis has obtained the vertical vibration of low-frequency motor be able to vibrate under a lower frequency compared to the first kind of structure , the fact proved so.Because the time and the experimental condition limit, there are lots of deficiencies in the low-frequency motor .Such as the pretightening force cannot be very good control, therefore has not been obtained the relations between it and the rotational speed, the output torque .Although low-frequency motor has so many deficiencies in design and manufacture aspects, obtained some valuable conclusion to provide reference and proposed some suggestion.In future view, the present studying work provide some experience for designing this type of motor in the future and lay foundations for further developing and manufacture of this type motor.