I have one of these941189) but the bugger blows way too much air and is very loud. So I bought one of these and that did slow things down a bit but not enough.
I have a 10A solid state relay and a microcontroller or two sitting around. I was curious if I could control the speed of the AC motor by cycling the availability of the juice like I could with a DC motor. IE: Hook the hot wire through the relay and cycle it on for 20ms, off for 80ms for a 20% duty cycle or some such (with the ability to adjust the duty cycle of course, 100% for 5 seconds at start, etc).
I don't know much about AC though and less about AC motors. Is this a valid approach? Will it burn up the motor, catch the relay on fire, destroy my karma, etc?