Ultrasonic motor driven by screw thread pair based on bending vibration mode and working method thereof

Abstract

The invention discloses an ultrasonic motor driven by a screw thread pair based on a bending vibration mode and a working method thereof, wherein the ultrasonic motor and the working method belong tothe technical field of the ultrasonic motor. The ultrasonic motor comprises a stator, a mover, a base and a pre-pressure loading component, wherein the stator (1) is fixed on the base (3). The mover (2) is assembled in the stator (1) through a screw thread which matches the inner surface of the stator (1) on the external surface. The pre-pressure loading component (4) is configured on the mover (2). A pre-pressure between the mover and the stator is adjusted through adjusting a pre-pressure bolt (41) at one end of the mover (2). In operation of the motor, the stator can drive the mover performmovement in two directions in an axis. Compared with a traditional thread pair linear ultrasonic motor, the ultrasonic motor is advantageous by a designing method of configuring the pre-pressure loading component on the mover, and a problem of incapability of changing the pre-pressure of the screw thread pair motor, thereby improving output efficiency and positioning precision of the motor.

Description

technical field [0001] The invention relates to an ultrasonic motor driven by a screw pair based on a bending vibration mode and a working method thereof, belonging to the field of ultrasonic motors. Background technique [0002] The linear ultrasonic motor is a new type of micro-motor that was developed and applied rapidly in the 1980s. It uses the inverse piezoelectric effect of the piezoelectric element and the ultrasonic vibration of the elastic body to move the elastic body through the friction between the stator and the mover. The micro-vibration of the mover is converted into the macroscopic linear (rotational) motion of the mover, which directly pushes the load. It has the advantages of compact structure, low speed and high torque, fast response, high positioning accuracy and electromagnetic compatibility. It has broad application prospects in aerospace, weapon equipment and precision drive fields. At present, the development speed of domestic ultrasonic motor is ve...

AI Technical Summary

Problems solved by technology

Although the ultrasonic motor driven by the screw pair has the advantages of simple structure and strong resistance to external impact, this motor does not have a pre-pressure adjustment device between the stator and the mover, and the pre-pressure between the stator and the mover will vary due to load changes. changes, so that the output force of the motor changes, and the output performance of the motor is difficult to control

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