On 5/5/21 8:37 AM, Paul Koning via cctalk wrote: > Incidentally, a way to get three phase power at a frequency of your choice is > to use a "variable frequency drive". That's basically a high power solid > state inverter intended to drive three-phase motors with a chosen frequency > resulting in the RPM of your choice. Depending on the model, those can go up > to 120 Hz or so, or all the way to somewhere around 400 Hz. I have a very > cheap one at home that runs on single phase 220 volt power, producing up to 3 > kW or so at anywhere up to 120 Hz. (Made by a company named Teco, > amusingly.) Most of these and especially the larger ones want three phase > mains input, though I'm told that even for those you can typically just > connect them to single phase power (between two of the three inputs, leaving > the third unconnected) at reduced power ratings. These devices are > surprisingly cheap, in particular they tend to be cheaper than "rotary phase > converters" which is how machine shops traditionally produce three phase > power when their mains is just single phase.
-- --Chuck Sent from my digital computer