I recently installed a ceiling fan in my bedroom.
> I don't know the make, but I got it from TLC - 48in white fan.
> It came with a four-speed wall-mounted controller.
>
> It works fine except that the slowest speed was somewhat faster than I would
> like. The motor is almost imperceptible at low speed.
>
> I spotted a fan controller in B&Q, looking very like a rotary light dimmer
> but with a picture of a fan on the knob. I bought one and fitted it instead
> of that supplied with the fan. The fan then had a slower minimum speed, as
> wanted, but the noise from the motor was excessive even at slowest setting.
> At faster speeds it became even louder. I refitted the original
controller,
in case something had gone wrong with the fan, and the noise was back to > normal. >
> What is going on?
>
> --
> Chris Melluish
>
The output from the controller may be of a waveform that doesn't suit the motor. AIUI something like a squarewave instead of a sine wave.
mrcheerful