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EFFICIENCY COMPARISON: PREVIOUS PIEZOELECTRIC SYSTEMS vs NEW PATENTED PIEZOELECTRIC GENERATOR SYSTEM

 
     
 

PREVIOUS PIEZOELECTRIC TECHNOLOGY:

 

 
 

Piezoelectric material sheet 120 x 50 x 0.15 mm, with a g33=0.038 Vm/N.

 

The voltage generated by this sheet when a force of 100 N is applied:  
 

Comparison1

Comparison2

 

 

According to the supplier this sheet can generate a peak intensity of Iout = 3 mA applying the force at high speed.

 

Thus, with the previous piezoelectric technology, in this case sheet configuration, could generate a power of:

 

Vout = 0,095 v & Iout = 3 mA = 0,003 A

 

 

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NEW GENERATOR SYSTEM:

 

 
 

Piezoelectric element configuration: Cylindrical piezoelectric elements of 1.5 mm in diameter by 15 mm in thickness, we would have that each piezoelectric element would have a volume of:

 
 

 

Comparison3

 

 
 

Number of piezoelectric elements: With the same type and quantity of piezoelectric material 120 x 50 x 0.15 mm = 900 mm3, in our generator with the same amount of material we could have 900 mm3 / 26,5 mm3 = 34 piezoelectric elements. And by applying the same force of 100 N on the 34 piezoelectric elements, I will have a force in each of 100 N / 34 = 2.94 N

 

 
 

Each piezoelectric element will generate a voltage of:

 

Comparison4

 

 
 

Thus, in our generator with the same amount of material as in the sheet 900 mm3, we have 34 piezoelectric elements, which are all activated simultaneously by an activation plate, at the same speed, with a force in each one of them 2.94 N, and in each piezoelectric element there is AC / DC Converter, which considering the loss of voltage by the conversion, we can consider a continuous output pulse of approximately 925 V, that is, we will have 34 pulses of: V = 925 V and I = 3 mA

 

 
 

Creating the matrix with the serial and parallel configuration of this 34 piezoelectric modules, we increase the output voltage and the output current, to achieve the output power:

 
 

 

Comparison5

 

 
 

CONCLUSIONS:

 
     
 

With the same volume of the same PZT piezoelectric material, with the same constant g33, applying the same force at the same speed, and considering a material cost of 20 € for comparison we have this values:

 
 

 

Comparison6

 

It is much more efficient our Generator System

 

 
 

This HUGE IMPROVEMENT OF EFFICIENCY can be quickly explained by considering:

 

1.- The smaller area of application of the force (100 N) of the piezoelectric element much greater will be the voltage:

 

- Sheet Area = 120 mm x 50 mm = 6.000 mm2
- Matrix of 34 Piezoelectric elements Area = 34 x p x (1,5 /2)^2 = 60 mm2

 

1st Voltage multiplier factor = 6.000 mm2 / 60 mm2 = 100

 

2.- The greater thickness of the piezoelectric element much greater will be the voltage:

 

- Sheet thickness = 0,15 mm
- 34 piezoelectric elements thickness = 15 mm

 

2nd Voltage multiplier factor = 15 mm / 0,15 mm = 100

 

TOTAL VOLTAGE FACTOR = 1st factor x 2nd Factor = 100 x 100 = 10.000 (This means that our system is 10.000 times more efficient than the existing system in terms of voltage generation with the same material.) … But this is not all…

 

3.- In addition to this Total Voltage Factor, connecting in series the elements it considers appropriate, adding its output voltage (Vout), but also being 34 identical and simultaneous signals, allows me to make connections in parallel to increase the output current (Iout), describing the Matrix that most interests us