Piezoelectric material has generated lots of interest in the field of electronics and mechatronics. It has a wonderful property to generate electrical field with the application of mechanical force and the vice versa is also true. Because of this property there are plenty of applications of this material in your daily life.
Let’s briefly touch the important properties of this material so that discussing with potential piezoelectric supplier you are well aware of this.
If you try to plot actual graph between amounts of stroke vs. applied voltage for any piezo actuator then you will not find it as perfectly linear curve as expected theoretically. It is rather in ‘S’ shape and at lower voltage with increasing voltage it is concave upwards.
- Effect of high electric field
You can apply maximum voltage up to the range of 9KV per mm however with application of such range of high voltage its lifetime may be reduced. Therefore, it is recommended that the operating range should be in the range of 4KV per mm.
Piezoelectric material also exhibits hysteresis characteristics as the amount of force applied on it does not follow the same path while charging and discharging. However, with aging the hysteresis characteristics tends to reduce.
Piezoelectric material exhibits creep effect, which means when voltage is applied it continues to expand however when the voltage is reduced to zero level then the material does not go back to the same level of strain. Due to its creeping property, it continues to draw current at lower level.