Double-rotar column travelling-wave type single-phase drive ultrsound electric machine

Abstract

The present invention is double rotor column traveling wave type monophase driving ultrasonic motor, and belongs to the field of miniature motor. The ultrasonic motor consists of mainly metal column, piezoelectric ceramic chip, rotors, output shaft, butterfly spring and pressing nut. The piezoelectric ceramic chip is adhered to the flat surface in the middle part of the metal column. The output shaft has one end in semi-spherical structure pressed directly onto the inner conic surface of the metal column while the butterfly spring presses the other semi-spherical rotor onto the other inner conic surface of the metal column. The pre-pressure between the stator and the rotor is obtained via regulating the pressing nut to change the deformation of the butterfly spring. When AC voltage is applied, the points on two ends of the metal column generate elliptic motion and friction force is generated between the stator and the rotor to rotate the rotor, with the motion being output via the shaft.

Description

Technical field: [0001] The dual-rotor cylinder traveling wave type single-phase drive ultrasonic motor of the invention belongs to the ultrasonic motor in the field of micro-motors. Background technique: [0002] Ultrasonic motor is a new type of micro motor using the inverse piezoelectric effect of piezoelectric ceramics and ultrasonic vibration. Among them, the cylindrical traveling wave ultrasonic motor belongs to a kind of traveling wave ultrasonic motor. Most of the rod-type traveling wave motors in the prior art adopt a Langevin vibrator structure driven by one end, which involves the pre-tightening force of the piezoelectric ceramic sheet, so the structure is complicated. At the same time, because the motor needs two-phase excitation signals, the drive circuit is relatively complicated, which brings great difficulties to miniaturization, thus limiting the miniaturization and industrialization of traveling wave motors to a certain extent. Invention content: [000...

AI Technical Summary

Problems solved by technology

Most of the rod-type traveling wave motors in the prior art adopt the Langevin vibrator structure driven by one end, which involves the pre-tightening force of the piezoelectric ceramic sheet, so the structure is complicated

At the same time, because the motor needs two-phase excitation signals, the drive circuit is relatively complicated, which brings great difficulties to miniaturization, thus limiting the miniaturization and industrialization of traveling wave motors to a certain extent.

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