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I have a brand new DC motor pedestal fan with 12 speeds. At the very low speeds the motor makes a whiny bearing type noise. Is this normal for low voltage DC fans?

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DC fans can be brushless or direct drive (Servo). The sounds could be caused by the low DC voltage generating oscillations in the stator windings. I don't have a whole lot of experience with DC motors. However, I see this issue a lot in AC replacement motors that are poorly manufactured overseas. If it's a new fan, I would return it for another one. It will probably only get worse.

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