DIY Phase converters

[clytle374]

Anyone got a good online source for the calculations/plans on phase converters made from 3 phase motors?

The place I work at part time uses a phase converter built by a guy.  It is a small unit based on a 1.5 HP motor, time delay, 2 start capacitors, and 2 contactors.  We need a larger unit and have a 20 HP motor for the purpose but the guy that knows about it health has declined and is not able provide info,  but I should know these things anyway.   

I did use google but was hoping someone here could point me to a good source.

[Jim Mc]

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