For a standard run-of-the mill piezo buzzer (as in the image below), what order of magnitude would the deformation be (compared to 0V) that occurs when driving it within its normal operating conditions? Micrometers?
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1\$\begingroup\$ Link to a proper data sheet. Then you can calculate it from sound pressure levels, surface area and operating frequency (if it isn't explicitly stated). \$\endgroup\$Andy aka– Andy aka2021-09-22 12:49:25 +00:00Commented Sep 22, 2021 at 12:49
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\$\begingroup\$ For example: arduino.cc/documents/datasheets/PIEZO-PKM22EPPH4001-BO.pdf SPL is ~90dB typical. \$\endgroup\$Larsupial– Larsupial2021-09-22 13:01:46 +00:00Commented Sep 22, 2021 at 13:01
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\$\begingroup\$ Some important words you might have missed in my earlier comment: Then you can calculate - also there are probably about 100 different types in that link. Focus on one and YOU do the math. If you need formulas, the internet should be good for that. \$\endgroup\$Andy aka– Andy aka2021-09-22 13:06:48 +00:00Commented Sep 22, 2021 at 13:06
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1\$\begingroup\$ Thanks Andy, I didn't miss those words. Was just thinking that this deformation would not be linear, so a simple model like a plunger (is that the right word?) moving up and down wouldn't cut it. Manufacturers do not seem to state it explicitly, since why would they? \$\endgroup\$Larsupial– Larsupial2021-09-22 13:09:45 +00:00Commented Sep 22, 2021 at 13:09
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1\$\begingroup\$ If you have any machinist friends, could mount a dial indicator (micrometer) and likely get a physical reading of the actual displacement. \$\endgroup\$rdtsc– rdtsc2021-09-22 13:39:17 +00:00Commented Sep 22, 2021 at 13:39
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Figure 3 in this paper implies on the order of 0.6 nm / V, so 3 nm with a 5 Vpp drive.
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\$\begingroup\$ Interesting, thanks! But these are purpose-built piezo actuators. I'm specifically looking for an answer if someone tried to determine this for these simple buzzers. Just curious. \$\endgroup\$Larsupial– Larsupial2021-09-22 13:06:46 +00:00Commented Sep 22, 2021 at 13:06
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\$\begingroup\$ I think you have misunderstood the x axis in your answer. \$\endgroup\$Andy aka– Andy aka2021-09-22 13:12:32 +00:00Commented Sep 22, 2021 at 13:12
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1\$\begingroup\$ @Larsupial To your curiosity, see (in french ... how to measure ...) j3ea.org/articles/j3ea/pdf/2008/02/j3ea08012.pdf \$\endgroup\$Antonio51– Antonio512021-09-22 14:31:28 +00:00Commented Sep 22, 2021 at 14:31
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1\$\begingroup\$ Thanks Antonio51. Reported is ~400 pm/V, for 280 layers of piezo material (if interpreting the French right), close to Davide Andrea's value. Still wondering about these ubiquitous low-cost piezos buzzers. \$\endgroup\$Larsupial– Larsupial2021-09-22 14:41:51 +00:00Commented Sep 22, 2021 at 14:41
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2\$\begingroup\$ If I understood correctly, these buzzers are mounted on a (circular) brass plate and form a "beam" which deforms when a voltage is applied between the "terminals". Here also what I found i.sstatic.net/poNFH.png \$\endgroup\$Antonio51– Antonio512021-09-22 14:51:28 +00:00Commented Sep 22, 2021 at 14:51
