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Most of the inverters cant reproduce proper Sine Wave.They are usually producing modified square waves.Some high cost inverters can produce pseudo sine wave(more similar to sine wave).

The fans field windings are designed to produce proper revolving field only with standard sine wave.When using modified square wave the field produced will be jerky.These jerks are the main reason of sound.The un-filtered harmonics in the produced wave is also a factor

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Q: Why ceiling fans generally make noise when run by inverter?
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