

Contact 
Facebook 

Sitemap 
Download 



The voltage generated by the piezoelectric element is proportional to the pressure applied: 



We obtain the following table:



g33 is the piezoelectric voltage constant in millivolts per meter/Newton corresponding to a ratio of a potential difference generated (in volts) to force F applied (in Newton) for a 1meterlong piezoelectric element.
h is the thickness or height of the piezoelectric element.
P is a pressure applied on the piezoelectric element; since the pressure P is the force F applied perpendicular to a surface of the piezoelectric element per area A over which that force is F distributed, that is, P = F/A, then 

We propose the example of a cylindrical piezoelectric element, with the following dimensions: 

D = 1,5 mm = 0,0015 m
D = 2 mm = 0,002 m
D = 4 mm = 0,004 m 
h = 2,5 mm = 0,0025 m
h = 5 mm = 0,005 m
h = 10 mm = 0,01 m
h = 15 mm = 0,015 m 
We consider typical values of piezoelectric constant voltage:

g33 = 0,040 Vm/N
g33 = 0,050 Vm/N
g33 = 0,060 Vm/N 

Finally, we consider different application forces (F): 
F = 1 N ... F = 6 N 



________________________________________________________________________________________________________________________________________________________________________



 The maximum value (3.055,77 v) is achieved with greatest force (6N) with the smallest area (D = 1,5 mm), with greatest thickness (h = 15 mm), and with the highest piezoelectric constant (g33 = 0.060 Vm / N).
 The minimum value (7,96 v) is achieved with lowest force (1N) with the largest area (D = 4 mm), with smallest thickness (h = 2.5 mm) and the lowest piezoelectric constant (g33 = 0.040 Vm / N). 





In the same way, by controlling the speed at which the force is applied in an piezoelectric element, the current Iout can be controlled since current I depends on the variation of electric charge (dQ) over time (ds): 


As a result, we will have greater intensity if we apply a force very quickly as a thud, that if we applied the same force slowly and progressively.
CONCLUSION:
 Selecting a type of piezoelectric material, which has a piezoelectric constant defined.
 Defining the shape and dimensions of the piezoelectric element on which the force is applied.
 Controlling the magnitude of the force applied.
 And controlling the speed at which this force is applied.



IT IS POSSIBLE TO CONTROL THE OUTPUT VOLTAGE AND THE OUTPUT CURRENT OF A PIEZOELECTRIC ELEMENT 


