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How can one measure the speed of a 3-phase generator electrically?

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shamooooot:
Hello guys

I am looking for some help to measure the RPM of an (AC permanent magnet synchronous generator) electrically through one of the output phases.. I was suggested this would be a better method than going through the hassle of mounting a sensor or encoder..

Thank you

gf:
Just measure the frequency of the generated AC voltage, it is proportional to RPM.

shamooooot:

--- Quote from: gf on April 18, 2023, 09:34:51 am ---Just measure the frequency of the generated AC voltage, it is proportional to RPM.

--- End quote ---

Do I probe between two of the phases? can you please share with me the equation for this?

NiHaoMike:
If you sense zero crossings on all 3 phases, you'll get faster response to changes since it would triple the frequency you're measuring.

jonpaul:
Bonjour à tous
Simplest solution make an H field probe, ( magnetic field)  zero cost:

Any coax, with a  BNC con, coax other end to 2..9 cm dia. wire loop,  10 turns any insulated wire.
BNC to a scope or frequency counter


approach the motor or gen, position loop so one phase dominantes, thus a single phase sine wave, to get the frequency

RPM = 60X frequency

Jon

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