Hi!
Oh, received quite a few answer
Variac: I don't have any variac, but have multiple transformers with multiple output below 24V, and one 220V->380V (or 220V->140?). (But found some fun stuff, 120A germanium diode, 25A silicon diode in home made car battery charger, a few transformers, etc).
Dimmer: Some of you said, a Dimmer sould be okay, but dimmers doesn't like inductive loads. What sould I modify on them? Maybe can it work without (the dimmer is up to 300W, fan is 50W, but I don't about starting current, etc..)
VFD: Googled it, haven't found anything cheap, so I think I may build one. But how? Probably an H bridge with an arduino wouldn't be enough
Motor replacement: Maybe I could find a universal 24-12V motor but I'm not sure that is powerful enough or is even near the right RPM.
DC Fan: I don't say that a standing fan looks cool, but computers fan are less cooler, and cools less. And I have to get some better PSU than a 1A charger. (For that 2 relays for my speakers are good enough
) But cool idea, I'm considering getting some. But the AC fan is still fun, I'm curious that can it be solved
The thing I afraid of is that the motor has a big capacitor. In the garage there are some old motors, which have capacitors that uses the starter winding, if the motor can't reach the operating RMP, those starter windings can be burnt for too long on time. Maybe this motor is similar?
And there is 4 wires going into the motor, with no external circuit. I don't know what it is, and I afraid it is neccesary for the "built in speed control" like separate windings or something. (Grandfather says, the motors in the garage can't be speed controlled, because they'll stall or continously need to use the starter cause they are not commutator type - and yes, they aren't universal, they're
where the armature is shorted kind of motor)
Thanks for your help