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Old 07-04-2011, 12:05 PM
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static converter

I have a static converter for the milling machine, a table top model with power feed 30 in travel I bought for $175 with collets, dial gage a few bits. a used converter was $ 100. I had a spare 3 ph motor t wired into the system. It will not run at full speed. turn on the system. start the slave motor, turn on the mill, turn off the slave, a rotory is nicer but more expensive. The motor is direct drive and a spline drive, not easy to change to a 1 phase.

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Old 07-04-2011, 01:09 PM
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I'm not familiar actually hooking up 3 phase motors with a slave motor, but if it's as I imagine.. It would totally not be worth it to me.
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Old 07-04-2011, 10:02 PM
richard stewart 3rd's Avatar
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The link is to YouTube w/ a home made rotary phase converter
powering a lathe. It's pretty cool.
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Old 07-05-2011, 08:22 AM
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Even that rotary converter, while just fine for light start load equipment such as the lath in that video, would not work for a high load air compressor. That set-up would be a big improvement over a static converter since it would apparently allow full, or near full, power once the equipment is running while the static type would only allow about 2/3 of the rated power (which would destroy an air compressor motor ). The type of rotary converter that would be useful with a compressor would be the type that uses an idler motor in conjunction with a large capacitor bank for high start-up loads. Also since a compressor is automatic start the supply voltage MUST be wired so that power can not be turned on until the converter is running, it must be wired so that the converter has to be turned on first. If someone forgets to start the converter when using something like a lath, mill, saw, etc it's no big deal, just turn it off and start the converter, but automatic start equipment such as a compressor could be seriously damaged if it switched on unnoticed while the converter was not running. The motor would remain stalled and would most likely burn out in a couple of minutes.

This is what I was talking about when I said the compressor being discussed might be a good deal IF the buyer fully understands what he is getting into. While there are a couple of ways of making it work properly there are even more ways of seriously damaging it and use of the wrong converter, even the wrong type rotary converter, could result in a burned out motor.
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