I'm looking to control the speed of a single-phase, C-frame 110VAC fan motor (typically found in bathrooms) with a simple variable-frequency- drive circuit, to learn how variable frequency drives work. IIRC, these C-frame motors are less than 100W.
Any books on the topic, or online schematics, for a beginner?
By the way, I browsed eBay for variable frequency drives, and noticed that most of them are for 3-phase motors. Are single-phase VFDs uncommon? If so, why?
Thanks,
Michael