Piezoelectric ceramic driver

Abstract

The invention relates to the field of piezoelectric ceramic device technology and specifically relates to a piezoelectric ceramic driver, the piezoelectric ceramic driver comprises a clamping seat, a clamping cover and a plurality of piezoelectric ceramic plates, the plurality of piezoelectric ceramic plates form a plurality layers of piezoelectric ceramic plates folding between the clamping seat and the clamping cover, the piezoelectric ceramic plates are connected with the clamping seat and the clamping cover through a screw, each layer of piezoelectric ceramic plate comprises two side-by-side piezoelectric ceramic plates with opposite polarities, polarities of adjacent two piezoelectric ceramic plates are opposite, an electrode plate is arranged between each two adjacent layers of piezoelectric ceramic plates, the plurality of piezoelectric ceramic plates are connected structurally in series and electrically in parallel. According to the invention, the clamping seat and the clamping cover clamp the plurality of piezoelectric ceramic plates, so that defects caused by high sintering and glue bonding are avoided, and the reliability of the driver; and the driver adopts a mode of structure connection in series and electrical connection in parallel, heavy deformation quantity is ensured, and driving voltage is reduced.

Description

technical field [0001] The invention relates to the technical field of piezoelectric ceramic devices, in particular to a piezoelectric ceramic driver. Background technique [0002] With the development of driver technology, piezoelectric driver technology has been developed rapidly. The piezoelectric actuator commonly used at present is a multilayer co-fired piezoelectric ceramic actuator. [0003] Compared with the traditional electromagnetic driver, the multilayer co-fired piezoelectric ceramic driver has many advantages: 1. Fast response speed, the response time of the piezoelectric driver is 0.01-0.1ms, and the response time of the electromagnetic driver is 2-5ms; 2. High frequency, The piezoelectric driver can reach 1000HZ per second, while the electromagnetic driver can only reach 100HZ per second; 3. The driving voltage is low, which is conducive to the miniaturization of devices. [0004] However, the existing piezoelectric actuators also have obvious disadvantages...

AI Technical Summary

Problems solved by technology

[0004] However, the existing piezoelectric actuators also have obvious disadvantages: 1, the manufacturing cost is high, the equipment of the whole production line is very expensive, the production cycle is long, the output is low, and the process is complicated; currently only a few enterprises can produce it; 2, The reliability of the internal electrodes is low, the internal electrode lead-out and internal electrode packaging processes are complicated, and electrode breakage and breakdown are prone to occur; 3. The tensile strength (3×107N / m2) of piezoelectric ceramic materials is only one tenth of the compressive strength 1. It is easy to be damaged under high power condition

[0005] The main reason is that the existing multi-layer co-fired piezoelectric actuator is to first print the inner electrode on the ceramic diaphragm, then superimpose many layers and then sinter at high temperature, and then bond several sintered piezoelectric ceramic stacks together with glue During the sintering process, the side electrodes are easily broken due to the impact of the sintering shrinkage of the material, and the glue that bonds multiple stacks will also break after aging, which will affect its life. The way the electrode is made, the electrode is very thin, and it is very easy to break during the firing process and use

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