Microminiature antifriction driving type linear ultrasonic motor and exciting mode thereof

Abstract

The invention discloses a microminiature antifriction driving type linear ultrasonic motor and an exciting mode thereof. The motor comprises a metal base plate and a piezoelectric ceramic slice, the piezoelectric ceramic slice is provided with three polarization partitions which are same in direction of polarization, the middle polarization partition is a bending vibration polarization partition, the polarization partitions located on two sides are longitudinal vibration polarization partitions, the metal base plate includes a base plate body, one side of the base plate body is composited with the piezoelectric ceramic slice, a first drive foot and a second drive foot are disposed at two ends of the other side of the base plate body respectively, the first drive foot and the second drive foot are oppositely arranged with the longitudinal vibration polarization partitions located on two sides of the piezoelectric ceramic slice respectively, and the bending vibration polarization partition and the longitudinal vibration polarization partitions are respectively connected with corresponding excitation power supplies. Consequently, compared with traditional ultrasonic motors with same size, the microminiature antifriction driving type linear ultrasonic motor has the advantages that the motor body is compact in structure, stable in performance and large in output power, and the motor of the type has a wide application prospect and a study value in the field of microminiature actuators.

Description

technical field [0001] The invention relates to a miniature anti-friction driven linear ultrasonic motor and an electric excitation mode, belonging to the field of ultrasonic motors. Background technique [0002] Ultrasonic motor is a new type of actuator that uses the inverse piezoelectric effect of piezoelectric ceramics to excite ultrasonic vibrations and is driven by friction. The linear ultrasonic motor is a kind of ultrasonic motor. Compared with traditional electromagnetic motors, ultrasonic motors have the advantages of large torque-to-mass ratio, fast response, precise positioning, and no electromagnetic interference. They have broad application prospects in the fields of biomedicine, precision drives, optical devices, and aerospace. [0003] The traditional linear ultrasonic motor requires the metal substrate to have two working modes. The two modes produce elliptical motion after the combination of the driving end, and then push the rotor pressed on it to produce...

AI Technical Summary

Problems solved by technology

This type of ultrasonic motor has high requirements on the frequency consistency of the two-phase modes, and due to the effect of pre-pressure, the working modal frequency will drift, and the sensitivity of the modal frequency of the initial design of the metal substrate to the pre-pressure is usually inconsistent. Therefore, it is difficult to control the motor and the output efficiency is low.

Images