Double Chute Modal Conversion Type Ultrasonic Motor Design And Experimental Studies

With the inverse piezoelectric effect of piezoelectric materials and the friction transmitting ultrasonic vibration, ultrasonic motor can get the power to become a driving mechanism. USM can be made in a simple structure, have a quick response, work in a low speed and high torque and be free from outside interference. Now USM has been widely used in high technology fields, such as precision manufacturing, aerospace, medical and robotics. So far, USM has developed various shapes and styles. One of them in a bar-type of longitudinal-torsional vibration and standing wave is to be studied in this article. The specific structure being designed in this paper is the USM of a lognitudinal-torsional vibration converter with multiple diagonally slitted parts.After collected and studied a large number of information, I have learned the development and prospect of USM and mastered its driving principle and other related fields of knowledge, the movement mechanism of ultrasonic motor. The involved knowledge of the designed USM in this papers includes the parameters of piezoelectric ceramics, the vibration theory, the generation principle of standing wave, the longitudinal and torsional vibration theory of metal pole, the design and calculation of motor's vibration and the related calculations of vibration transmission rod with multiple diagonally slitted parts.The designed USM of a lognitudinal-torsional vibration converter with multiple diagonally slitted parts uses the Langevin structure, including the front cover, piezoelectric ceramic reactor, the back cover. In addition, two other compared USMs are designed for this article, the longitudinal-torsional vibration converter with diagonal slits and the longitudinal-torsional vibration converter with holes. The three motors are in the same size and similar structure. Through the experiments of all the designed USM, their performance curves were drawn about the relationship of frequency, input voltage and preload between speed. The performance values all the above-mentioned were got when the USM works in its maximum speed. Compared the prototypes of three designed USM in frequency, input voltage and preload, the maximum speed of the USM of a lognitudinal-torsional vibration converter with multiple diagonally slitted parts is about 6 times the single slitter USM, and is about 10 times the holes USM.Through experiments the designed USM has basically reached the envisioned requirements at its various aspects, but there are still many differences from the theoretical model. It can be seen that the mathematical model of the motor still needs an in-depth study. What's more, there are many problems in other aspects of the motor ,for example Friction materials and precision, to obstruct the practical process. Therefore, the research in USM needs to be strengthened, and I hope this paper can provide some references for future research.