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Maximum theoretical power from piezoelectric harvesting

  1. Jun 18, 2016 #1
    Hi there....
    I have an application where I know the vibration frequency/force/acceleration of the source...

    How can I find the maximum theoretical power output (in mw/watts...) of a tuned piezo where its resonance is the same as the source vibration frequency...
     
  2. jcsd
  3. Jun 18, 2016 #2

    berkeman

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    Welcome to the PF.

    Just try looking at typical piezo datasheets for parts that fit your application.
     
  4. Jun 18, 2016 #3

    berkeman

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    What are the frequency and amplitude of your application?
     
  5. Jun 18, 2016 #4
    Consistent 200 hz...

    Typically 0.1 G acceleration on a 1 kg object (so 20 G on say a 5 gram harvester...)....sometimes it is 1 G on the 1 kg, but rarely..

    Is there any way I can get 1 W+ of energy from it using a piezo or other vibration harvester? especially on the low end so it is consistent... Does not have to be a commercially available product, even experimental things that are out there...
     
  6. Jun 19, 2016 #5

    davenn

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    again, as Berkeman said, without knowing the properties of the sensor, the answer to that is unknown


    Dave
     
  7. Jun 19, 2016 #6
    what else is necessary?...
     
  8. Jun 19, 2016 #7

    davenn

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    you cant seem to give those, so you question is still unanswerable


    D
     
  9. Jun 19, 2016 #8

    berkeman

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    How are you going to couple the piezo to the object(s)? Can you get a straight compression-expansion motion on the piezo? Or will it be more of a bending moment?

    What piezo do you plan on using? Can you link to the datasheet? Have you looked at Kynar Piezo Film?

    http://www.piezotech.fr/fr/2-products-piezoelectric-polymers/news/news-31-p-vdf-trfe-piezoelectric-films.html [Broken]
     
    Last edited by a moderator: May 8, 2017
  10. Jun 19, 2016 #9
    I'm looking at piezos...I plan to use a cantilever (probably)...

    How can I tell how much force it would take on each piezo to generate a watt.....and what about the frequency...?
     
    Last edited by a moderator: May 8, 2017
  11. Jun 19, 2016 #10
  12. May 1, 2017 #11
    Suppose you have a predefined volume of piezoelectric (10cm^3). What is the maximum harvested power using piezoelectric?
     
  13. May 1, 2017 #12

    berkeman

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    What reading have you done on this so far? What shape would be the best for harvesting, given that volume? :smile:
     
  14. May 1, 2017 #13
    You need to know the output resistance of the piezo sensor and you also need to know how much voltage it generates at that frequency for a given force input. Here is an example of the chart you need for whichever accelerometer you have:

    accelerometer_sensitivity.png

    Here is more information on accelerometer selection. http://www.ni.com/white-paper/3807/en/ If your goal is to generate power, I'd pick one that resonates at 200hz or whatever frequency the input from the machine will be.

    When you know the voltage output per-G of acceleration at a given frequency, and you also know the output resistance, you can then calculate wattage.

    http://www.wikihow.com/Calculate-Wattage
     

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