| Ultrasonic motor(USM) is a new development of the actuator. So far more than thirty years, because of its unique mechanism and advantage, increasingly wide range of applications, from automotive to aerospace field, precision instrument to intelligent robot etc from all different levels application of ultrasonic motor. Different from the conventional electromagnetic motor, the ultrasonic motor working principle is to use the inverse piezoelectric effect of piezoelectric ceramics to motivate oscillator micro vibration in the ultrasonic frequency domain, then convert oscillator micro vibration to rotor macro linear(rotating) motion by friction effect, due to its coreless structure do not produce magnetic field and not subject to the interference of magnetic field in work process, and character with low speed and high torque and regular work in harsh environmental conditions etc, so only ultrasonic motor is available in some special occasions.Ultrasonic motor based on beam vibration principle, due to its characters with simple structure, convenient processing and high efficiency etc, make it has wide application prospect. This paper design bar type ultrasonic motor based on beam bending vibration and mode conversion type ultrasonic motor based on beam longitudinal vibration and torsional vibration, then test the mode conversion ultrasonic motor after processed and assembled, sum up and analyze experiment results. The specific accomplishing work and obtaining achievement are as follows.(1)Understanding of the basic concept of ultrasonic motor, emphatically introduces its research statues, application situation, classify and character, draw forth the main content of this paper to research according to existing achievements and existing problems.(2)Introducing basic character of piezoelectric ceramics, establishing math model of the bar type ultrasonic motor stator vibration and doing simulation of its movement process by simulation software, analyzing effect of pre-pressure between stator and rotor on its contact model.(3)Modeling finite element model to structure of the bar type ultrasonic motor stator, then doing a dynamics simulation analysis, mainly includes mode analysis and harmonic response analysis, determining structure of the motor.(4)Analyzing operation mechanism, vibration model of mode conversion type ultrasonic motor and effect of chute sizes on its longitudinal-torsional frequency.(5)Designing other components of mode conversion type ultrasonic motor, testing its property after processed and installed, summing up the experiment results and putting forward proposals. |
