In-plane buckling composite mode thin type straight line ultrasound electric motor

Abstract

The invention discloses an in-plane buckling compound mode thin linear ultrasonic motor which comprises a frame, an active cell, a vibration generator and a pretension mechanism. A slide seat is fixed in the frame; the active cell is movably arranged at the slide seat; the vibration generator comprises a rectangular metal elastic plate, a rectangular piezoelectric ceramic plate and a dial gear; the metal elastic plate and the piezoelectric ceramic plate are fixedly connected; the dial gear is fixedly connected with the middle position of the side surface along the length directions of the metal elastic plate and the piezoelectric ceramic plate; the dial gear is contacted with the active cell; the top surface of the vibration generator is contacted with the pretension mechanism. The motor is easy to design; the polarized subareas of the piezoelectric ceramic plate are less; the design and processing are easy. The resonance frequency of the in-plane buckling vibration tends to be consistent by changing the length-width ratios of the rectangular piezoelectric ceramic plate and the rectangular metal elastic plate, so as to generate a buckling resonance at the same frequency simultaneously; the motor has the advantage of simple and compact structure, which is thin, convenient for assembly and works reliably.

Description

technical field [0001] The invention relates to a motor using piezoelectric effect, in particular to a thin linear ultrasonic motor with in-plane longitudinal bending compound mode. Background technique [0002] The ultrasonic motor is a micro-motor that utilizes piezoelectric ceramic inverse piezoelectric effect and ultrasonic vibration. It is generally composed of a vibrator, a mover (or rotor) and a pre-compression mechanism, and the vibrator is usually composed of a piezoelectric ceramic sheet or a composite of a piezoelectric ceramic sheet and a metal elastic body. [0003] The patent No. "01127038.1" discloses a linear ultrasonic motor based on in-plane vibration of a rectangular piezoelectric ceramic thin plate. A whole piezoelectric ceramic plate is used as a vibrator, and the piezoelectric ceramic plate is polarized along the thickness direction and divided into four zones. , in which the sinωt excitation signal is applied to the two diagonal regions, and the cosωt...

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Problems solved by technology

[0003] The patent No. "01127038.1" discloses a linear ultrasonic motor based on in-plane vibration of a rectangular piezoelectric ceramic thin plate. A whole piezoelectric ceramic plate is used as a vibrator, and the piezoelectric ceramic plate is polarized along the thickness direction and divided into four zones. , in which the sinωt excitation signal is applied to the two diagonal regions, and the cosωt excitation signal is applied to the other two diagonal regions. However, the linear ultrasonic motor using the piezoelectric ceramic plate as the vibrator has the disadvantages that the piezoelectric ceramic plate is easy to break and the clamping is difficult.

[0004] The patent No. "200410101574.4" discloses a piezoelectric ceramic metal composite plate in-plane vibration linear ultrasonic motor. The composite plate is composed of eight piezoelectric ceramic sheets and metal plates that excite vibration. Each piezoelectric ceramic sheet is symmetrically pasted on the metal plate. Polarized on both surfaces and along the thickness direction of the vibrator, but the composite board needs eight piezoelectric ceramic sheets to excite vibration, the assembly process is complicated, and the assembly accuracy of the eight piezoelectric ceramic sheets is high, which increases the manufacturing cost of the motor

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