Anyone happen to know how the speed controller works on a Vent Axia fan? I have a 9" fans that has died, or maybe it's contoller has died. When turned on the fan will jerk in a direction set by the controller but not continue even if spun by hand.
The fan seems to have 2 windings connected in series, both of which measure out ok on a meter, and also if I flick the fan they both generate emf, so I suspect the motor is ok. Boths ends of the series coils, and the centre tap go to the controller.
The controller has apparently no active components, just a block whose shape implies a transformer, and switching for air direction and three speeds.
I presume that the controller somehow gives a phase shift to one of the coils, and direction is govened by which lags and which leads, but with no capacitors in it I don't see how it generates the shift.
Anyone got a clue how these things work?
AWEM