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Message: <blockquote data-quote="Ahall" data-source="post: 3884553" data-attributes="member: 49426">Phase converters are a great choice if you have multiple 3 phase machines, or larger horse-powers.  The downside is you don't get a true 3 phase signal and are limited to about 2/3 nameplate horsepower on a motor.  Upside is you can run multiple machines on the same rotary converter.  They are not that hard to build from salvaged components either.  The VFD is dedicated to a machine, and produces a truer 3 phase signal.On a small belt drive lathe or mill they also let you fine tune your speeds.</blockquote>