Rotary phase converters, troubleshooting modifying etc

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06 Jun 2022 00:57 - 06 Jun 2022 00:58 #244643 by smc.collins
anybody know of any good resources for building modifying repairing rotary phase converter ? I have a spindle drive erroring out due to low input voltage on the generate leg. voltages look ok idling, but that doesn't mean shit I can spin the drive up slowly, so I know that it it a inrush current demand situation, I am open to ideas on a resolution, I need this unit to last a bit longer while I wait for permits for 3 phase to be brought onto my property. 
Last edit: 06 Jun 2022 00:58 by smc.collins.

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06 Jun 2022 01:08 #244644 by spumco
RPC plans


Surplus Center has caps for tuning.
HGR Surplus has big motors for sale, assuming you're close enough that shipping isn't insane.

Hope that helps...

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06 Jun 2022 14:07 #244669 by tommylight
Is it a single motor with caps or the two motor version?
How many HP or KW?
Are you in US?

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06 Jun 2022 16:20 #244679 by smc.collins
I'm in the USA it's a balanced phase design with caps on l1 l2 l3 for balance on generated leg and start caps. It's a 15hp motor it's a bit undersized imho

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06 Jun 2022 16:23 #244680 by spumco
My rule of thumb, based on limited experience, is that a 2:1 factor is needed.  As in - 10hp consumer equipment = 20hp RPC motor.

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08 Jun 2022 10:57 #244759 by smc.collins
Decided to buy a diesel 75kw generator, problem solved and cost per kwhr is on par eith electric rates

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