What is the piezoelectric actuator ?
Piezoelectric actuator and its applications. Before we talk about the piezoelectric actuator, we need know the piezoelectric stack ceramic first.
It is also called laminated micro-displacement piezoelectric ceramics or multilayer stacked piezoelectric ceramic micro-motion devices. it can be used for micropositioning, valve control, Applications such as shock absorption. Piezoelectric stack ceramics can be used as electromechanical transducers to convert electrical signals into mechanical displacements and used in adjustment control systems. Multilayer stacked piezoelectric ceramics have small volume, high displacement resolution, fast response, low voltage drive, The output is large and so on.
Piezoelectric actuators (also known as piezoelectric ceramic actuators or mechanically packaged piezoelectric ceramics). it use stacked piezoelectric ceramics as the core driving source and discuss special mechanism structures, including mobile ends and fixed ends. The outer casing, the flexible hinge pre-tightening structure connected to the stacked piezoelectric ceramics, etc., the assembled piezoelectric ceramics are carefully assembled into the mechanical structure to form a mechanically packaged piezoelectric ceramic, which is also commonly referred to as pressure. Electric actuator, piezoelectric ceramic actuator.
The piezoelectric actuator can fully exhibit the advantages of high resolution, high response speed, large output and the like of the stacked piezoelectric ceramics, and it can output the displacement of the micro-nano scale generated by the stacked piezoelectric ceramics. In addition, the piezoelectric actuator also compensates for the shortcomings of the stacked piezoelectric ceramics, and the added external casing also protects the stacked piezoelectric ceramics and can be applied to other harsh environments.
Core can customize piezoelectric actuators according to the customer’s specific use, such as custom-made special pins. For applications that may be subject to torque, the structure of the piezoelectric actuator can be modified to withstand a certain amount of torque; for high frequency or high temperature environments, the design of the piezoelectric actuator can be designed. A plurality of heat dissipation holes provide corresponding interfaces for heat dissipation such as air cooling and water cooling.
The mainly piezoelectric actuator series
Piezoelectric actuators can be classified into high-voltage piezoelectric ceramic actuators and low-voltage piezoelectric ceramic actuators depending on the driving voltage. The high-voltage piezoelectric ceramic actuator is internally driven by a high-voltage stacked piezoelectric ceramic, and the driving voltage is generally up to 500V or 1000V; the low-voltage piezoelectric ceramic actuator is internally driven by a low-voltage piezoelectric ceramic, and the driving voltage is generally about 150V. High voltage piezoelectric actuators have lower electrostatic capacitance and generally have higher output than low voltage piezoelectric actuators.
From the appearance shape, the piezoelectric ceramic actuator can be further divided into a cylindrical piezoelectric ceramic actuator and a ring-shaped piezoelectric ceramic actuator. As the name suggests, cylindrical piezoelectric actuators have a cylindrical shape, while annular piezoelectric actuators are piezoelectric actuators with through-holes in the center, which are ideal for light transmission applications.
Piezoelectric actuators, the larger the outer diameter, the greater the output, and the maximum output of the core tomorrow standard product is about 50,000N. In addition, the longer the length of the piezoelectric actuator, the greater the displacement that can be output. In the core standard product, its maximum length can reach about 200mm, and its maximum displacement can reach 260μm.
Shenzhen HE-SHUAI LTD piezoelectric actuators have a standard length of 9mm to 200mm, a standard outer diameter of 9mm to 45mm, an output displacement of 9μm to 260μm, and a power output of 200N to 50000N. The annular piezoelectric actuator has an inner diameter ranging from 5 mm to 25 mm.
What is a piezoelectric actuator applications ? Here are some of projects what we did before
1.3GHz superconducting linear accelerator technology is one of the main development directions of international advanced accelerator technology. It is a hard X-ray source (ERL) based on energy recovery type linear accelerator, high energy high current proton accelerator, international linear collider (ILC), etc. The core technology. The frequency band of the cavity is adjusted by the large output and micro displacement of the piezoelectric ceramic.
The larger the outer diameter of the packaged ceramic, the greater the maximum output, and the maximum output force of the packaged ceramic of the outer diameter VS45 can reach 50,000N. The hardness test mainly uses the large output force of the piezoelectric ceramic to perform hardness test on the measured object.
The use of micro-EDM machining of micro-holes will produce a lot of debris, which will seriously affect the accuracy and processing speed of EDM. Piezo actuators are used in the device to utilize the micro-nano-scale displacement, high-frequency vibration, large output and other characteristics to effectively remove the debris generated by the processing, and play an excellent role in guiding debris.
The size of the cells is typically only a few microns in size, or even smaller. In the study of cell structure or pathology experiments, the probe needs to be accurately delivered into the interior of the cell. The piezoelectric actuator can be used for nanometer-level precise movement. It can drive the probe or sample cells to perform nano-scale micro-motion, and can accurately feed the probe into the cell without damaging the cell structure. It has been widely used in biotechnology. And in the field of life sciences.
Shock absorption and vibration reduction
Vibration is a need to avoid or eliminate in many mechanical systems, such as aerospace, automotive, and so on. When vibration is detected in the vibration monitoring system, by applying an electrical signal to the piezoelectric actuator, the piezoelectric actuator is subsequently displaced in the opposite direction to the vibration, thereby canceling the vibration.