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MFC P2 Type as an actuator

Question and Answers for making the MFC work

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MFC P2 Type as an actuator

Postby Johnterry » Tue Mar 27, 2018 8:09 am

Dear Sir/Madam,
I purchased two M5628-P2 and drove at 500Vpp using DRV2700EVM,I didn't attach the MFC to any stucture.And then the induced strain was really small which confused me a lot. I think I fail to understand some things provided on the website.
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Joined: Tue Mar 27, 2018 7:14 am

Re: MFC P2 Type as an actuator

Postby TPD » Tue Mar 27, 2018 9:11 am

Well, your observation are correct. As stated in the data sheet for the M5628P2 the free strain is -820ppm. So the the M5628P2 will contract (negative sign) by 820 parts per million over 56mm length which is 45µm.
The deflection of materials you are seeing on our website is applied mechanical engineering. If you place a strong actuator which strains OFF THE NEUTRAL FIBER (middle of an object) the 45µm strain will be amplified in a much larger deflection of your structure.
Please Google it or asked someone with mechanical engineering training [Bimorph equations, actuator neutral fiber] Here is a link to a basic education text
So you need to glue (bond) the MFC as outlined in the FAQ section to a structure, like a steel or FR4 beam (PCB) in order to see the larger deflection of a structure. The DRV2700 also allows you to feed Audio into the MFC so you can use it as a loudspeaker.
Please note that the maximum guaranteed voltage for the P2 type is 360V. Operating it at 500V over extended period of time might damage the unit.
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