Choosing the Right Multilayer Piezoelectric Actuator: Key Parameters That Impact Performance and Reliability

1.Introduction
2.Fundamental Working Principles
3.Core Selection Parameters
4.Understanding Performance Curves
5.Typical Applications
6.Conclusion

Introduction 
High-tech manufacturing is a world in which precision counts. In semiconductors, photonics or medical robotics, then it is likely that you would need to move things with a precision of a nanometer. Conventional motors and screws are not usually able to cope with this. They are overly frictious and oppositional. This is where multilayer piezoelectric actuators come into play. They are the condensation or muscle of the modern precision motion control.
But choosing the appropriate actuator is not by merely looking at a product catalog. You may have an unstable system in case you choose the wrong one. It may drift out of tune, or the actuator might even prematurely break. You must select the hardware according to your given task. The blog will allow you to comprehend the basic parameters and interpretation of the performance data. 

Fundamental Working Principles
One ought to know the working of a particular part before determining the appropriate one. When you place an electric field on a piezoelectric material, the shape of the material changes. This is the negative piezoelectric effect.
In old-style actuators, there is only one thick mass of ceramic. These needed large voltages, at times more than 1,000V to take but a small part. The actuators in modern times make use of multilayer co-firing. We do not have a single thick block, but hundreds of layers very thin of ceramics. An internal electrode separates each of the layers.Due to the thinness of the layers, a much lower voltage can be used to produce a very strong electric field. 

Core Selection Parameters
We divide the most important numbers into three categories.
1. Static Indicators
These inform you as to what the actuator may do in case of slow movement.
Free Stroke (Displacement): The maximum stroke of the actuator at peak voltage when the load does not push back is called the Free Stroke. Consider it as the reaching distance.
Blocking Force (Fmax): The actuator has how much push. The force will be the one measured when the actuator is blocked and is unable to move at all. If your load is very heavy, you need a high blocking force.
Mechanical Strength: This is the Static Stiffness (k). A rigorous actuator is similar to a very rigid spring. It is very resistant to outer forces. You divide it by dividing blocking force by free stroke:

k = Fmax/Delta Lmax

2. Electrical Indicators
Capacitance (C): Piezo actuators are like capacitors. Higher capacitance is normally found in a bigger actuator. This is significant as it informs you your driver requires to provide this amount of current. To move startlingly, you must have a driver capable of filling that capacitor.
Driving Voltage Range: This is the "fuel" for the actuator. 
3. Dynamic Indicators
Resonant Frequency: There is a natural speed, which every actuator enjoys vibrating at. You are generally supposed to work at quite a slower rate than this. A frequency at the resonant frequency could cause the actuator to shake itself to pieces.
Speed of Response: Piezo actuators are quick. Their response time is in micro seconds. This reasons why they are ideal in preventing vibrations or in fast switching.

Understanding Performance Curves
A few charts are usually contained in the data sheets. You do not need to be a scientist in order to read them but you need to be aware of the large trends.
Displacement-Voltage Curve (hysteresis): When you turn up the voltage between 0V to 150V and then back to 0V, the path is now different. The actuator doesn't return to the start point perfectly. This "lag" is called hysteresis. It is usually around 10% to 15%. A sensor will be required in a closed-loop system to provide a perfect accuracy.
Force-Displacement Curve: This is the most feasible graph. it demonstrates to you a trade-off. The higher the load, the shorter the distance that the actuator can travel. When you propel it exerting an equal force to its blocking force, it will not move at all.
Experienced Guide: Practical circumstances are intricate. These curves vary with temperature, high speed cycling, and the nature of the load (spring vs. dead weight). You can contact Bestarsensor to more professional help.
It is easy to remember the following steps To begin a project:
Check the Stroke and Force: How far do you need to move? What is the weight of the object? Always select an actuator with approximately twice the amount of stroke that you require. This provides you with a buffer.
Consider the Speed: How many times per second should it go? This informs you the frequency. To ensure that your power supply can respond to the charging current, check the capacitance.
Check Environment: Will it be operated in a vacuum? Is it very humid? Piezo ceramics dislike water.

Typical Applications
1. Micro-machining: In semiconductor equipment, the actuators aid in mask and wafer alignment. Here we are referring to nanometers of precision.
2. Optical Systems: Piezo stacks are used to tilt mirrors or move optic lenses in ultra-precise targeting when using a high-end laser, or when using a telescope. Fiber Optic alignment is also done with it.
3. Medical Tech: The type is applied in miniature pumps to deliver very specific amounts of medicine. They also make the weapons of the surgical robots, which are tiny fingers.

Conclusion
The correct selection of the multilayer piezoelectric actuator is the initial phase to an effective high precision system. There is no need to be so complex. The first thing is the stroke, the force and the electrical limits.
We offer various types of standard and custom solutions at Bestarsensor. We understand that each of the projects is challenged. There is nothing like a constructor can ask with a particular curve or a load that is tricky, just contact someone. We come to aid you in the process.