Before building my first vfd, I would like to build a easy and inexpensive ac to dc converter. It is actually a 130 v 3.8 hp commercial treadmill motor. This is simple enough for me to build, just a full bridge and smoothing cap, right? Does a motor need a smoothing cap? I can't seem to find a quick answer to that. A simple diagram with the actual parts I need to order would be great. I am a good machinist and auto tech, electronics, not so much. A simple speed controller diagram with component list would be nice too. Lot of them I can find online, none near the voltage and amperage to run a nearly 4 horsepower motor. I need to power a milling machine with a variable speed motor ( changing belts and pulleys really bites)without spending a lot of money on another VFD and three phase motor. Thanks for your help, and patience with a beginner. Remember, keep it simple k.
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