Three-phase alternating current generated by one phase alternating current?
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radiotech
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Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
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Posts: 1546
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The sound that three phase induction motors produce is a 50/60 Hz hum added to a lower pitch which represents the synchronous rate minus the slip. So a 3450 RPM motor, will run at that speed under load. With no load, it will be closer to 3600.
Motors on invertors sometimes have termination networks connected at the motor. That is to protect the motor against high voltage pulses, higher higher in frequency than their operating frequency.
Your fft pickup, for both types probably would work better with a magnetic field detector coil placed close to feeder cable to the motor from the VFD.
In actuality big inverter drives, especially pumps, scream so loudly, hearing protection in required when working close by.
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