Vibration exciter based on piezoelectric stack

Abstract

The invention discloses a vibration exciter based on piezoelectric stack. The vibration exciter comprises a piezoelectric stack driver, a vibrating mechanism and a packaging structure, wherein the piezoelectric stack driver is fixedly arranged in the packaging structure, and an outside input signal is input to the piezoelectric stack driver through a connecting wire penetrating through the packaging structure to drive the piezoelectric stack in the piezoelectric stack driver to vibrate. According to the technical scheme, the piezoelectric stack is adopted by the driver, the driving force of the piezoelectric stack is large, the output displacement of the piezoelectric stack is low, and the maximum output frequency of the piezoelectric stack is larger than 15 KHz. When loaded by sine alternating voltage, the piezoelectric stack can periodically vibrate along with the changes of the voltage, infinitesimal axial displacement is produced, and electric energy is converted into mechanical energy to be output. According to the vibration exciter, the components are simple, the number of the components is small, space needed by the design is saved, the structure is very compact, machining and assembling are easy, and the vibration exciter has the advantages of being high in output frequency, small in vibration displacement and size and easy to assemble. The vibration exciter is suitable for a high-precision driving, high-frequency-spectrum resonance driving and high-precision detecting system.

Description

[0001] technical field [0002] The invention relates to an exciter, in particular to an exciter based on piezoelectric materials, belonging to the technical field of precision machinery and instruments. [0003] Background technique [0004] The traditional vibrator driving device is a motor, which has a large vibration output force but a narrow output frequency band, which cannot meet the requirements of high frequency and small displacement excitation. For example, when calibrating a piezoelectric sensor, it is necessary to generate an accurate high-frequency excitation signal, and the excitation frequency is required to reach 15KHz-20KHz, while the excitation frequency of the vibrator on the market generally cannot reach 10KHz; and if the output displacement is too large, The device to be excited will vibrate violently, resulting in distortion or excessive noise of the collected signal. Piezoelectric stack drivers can be used in precision machinery and instruments to a...

AI Technical Summary

Problems solved by technology

[0004] The traditional vibrator driving device is a motor, which has a large vibration output force, but the output frequency band is narrow, which cannot meet the requirements of high frequency and small displacement excitation.

For example, when calibrating a piezoelectric sensor, it is necessary to generate an accurate high-frequency excitation signal, and the excitation frequency is required to reach 15KHz-20KHz, while the excitation frequency of the vibrator on the market generally cannot reach 10KHz; and if the output displacement is too large, The device to be excited will vibrate violently, resulting in distortion or excessive noise of the collected signal

Piezoelectric stack drivers can be used in precision machinery and instruments to achieve nanoscale displacement, force, and acceleration drives, and piezoelectric materials have a large operating frequency range. Common piezoelectric stacks are unpackaged and are usually used in applications. One end is pasted on the fixing part, the other end is pasted on the driving part, the assembly is inflexible, the piezoelectric stack is easy to be damaged during the disassembly process, and it is difficult to apply the pre-tightening force

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