Thanks Mark I have just been messing around with a patch lead with some large light globes in series and this seems to do the job of slowing it down without inducing any hum to the motor.
I guess I could just play around until I was happy with the speed (noise) and simly measure the voltage and...
Hi Mark this is not a three-phase motor, from looking around I believe it’s a High Slip Induction Motor.
Its just one of those little room type evap coolers, I want to run it at about half speed of its low setting and as silently as possible for night time use when sleeping.
.
Thanks for the reply’s guys, a few more please.
I have already found that the solid-state type speed controllers introduce more hum as the speed is turned down and are not suitable.
How is the speed controlled in a normal three-speed motor?
With the hum would stripping the motor and...
Hi I am looking for a little information on the motors they use in the room type evaporative air conditioners, these are normally on trolleys and it’s the type with centrifugal fans that I an most interested in.
I have noticed that some have an audible hum to them when running, what causes this...
