Quote:
Originally Posted by smdubovsky
He said capacitor (implying a static phase converter)
You said solid state. Solid state = VFD (since solid state by definition means semiconductors).
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So I mis-remembered the name. Sue me. It's been many years since I looked into converters.
Doesn't change what I wrote about static converters, but I'll go back and fix the text.
Quote:
Originally Posted by smdubovsky
At any expected home use scenario, a VFD will likely be cheaper than a rotary. Rotary makes sense if you have VERY high hp needs or a zillion machines to run/retrofit. VFDs are superior performance wise to any phase converter. Modern machines will use them for the spindles even when 3-ph power is used.
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Except you really need a VFD for
each motor for best results. If he gets a mill with only a single motor, then he only needs one. But, if he gets a mill with one or more powered feeds, then he'll need a VFD for each one (or a VFD for the main motor and a static/rotary converter for the others). Whereas a static or rotary converter will feed all of them just fine (assuming it's sized properly).