Large-moment double-rotor stress type longitudinal-torsional composite ultrasonic motor and electric excitation method thereof

Abstract

The invention discloses a large-moment double-rotor stress type longitudinal-torsional composite ultrasonic motor and an electric excitation method thereof, belonging to the technical field of ultrasonic motors. The motor comprises a stator assembly and a rotor assembly, wherein the stator assembly comprises a friction sheet, a first group of longitudinal vibration piezoelectric ceramics, a first balance weight block, a first group of torsional vibration piezoelectric ceramics, a flange, a second group of torsional vibration piezoelectric ceramics, a second balance weight block, a second group of longitudinal vibration piezoelectric ceramics, a fastening bolt and two radial bearings; and the rotor assembly comprises a rotating shaft, a locking nut, a spring cover, a spring, a first rotor, a key, a friction material and a second rotor. The method is operated by the first-order torsional vibration in a stator and the second-order longitudinal vibration in the whole of the motor, and the longitudinal vibration piezoelectric ceramics are placed near the contact surface of the stator and the rotors, namely the pitch plane of the longitudinal vibration to fully excite and apply the longitudinal vibration of the motor. Compared with the prior art, the invention has larger rotor blocking torsion.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic motors, and in particular relates to a high-torque double-rotor stress type longitudinal-torsion compound ultrasonic motor. Background technique [0002] Ultrasonic motor is a new type of power output device that utilizes the inverse piezoelectric effect of piezoelectric ceramics and ultrasonic vibration. Compared with electromagnetic motors, it has the advantages of compact structure, high torque at low speed, fast response (millisecond level), self-locking when power is off, good position and speed control, no electromagnetic interference, and low-noise operation. Longitudinal-twisting composite ultrasonic motor is a major category of ultrasonic motors. The research on it can be traced back to the late 1980s. Up to now, there are no less than dozens of types of structures. The longitudinal-twisting composite ultrasonic motor usually contains two vibrators—a longitudinal vibrator and a torsio...

AI Technical Summary

Problems solved by technology

However, the general longitudinal-torsion composite ultrasonic motor adopts a sandwich structure to play the role of longitudinal vibration piezoelectric ceramics, which has a low utilization rate for longitudinal vibration piezoelectric ceramics.

In 1998, Ueha developed a dual-rotor longitudinal-torsion composite ultrasonic motor, which can effectively use the vibration of the longitudinal-vibration piezoelectric ceramic sheet, but the disadvantages are: first, a part of the longitudinal-vibration piezoelectric ceramic sheet is placed on the rotor The above structure makes this kind of motor must add brush structure to work, and the processing technology of the motor is complicated; secondly, because the contact occurs between the piezoelectric ceramic sheets, the manufacture of the friction pair becomes complicated and difficult

These all limit the further improvement of the motor output torque

Images