The main reason for a static phase converter is to get a three phase
motor to start spinning. The secondary reason is balance the power a
little with capacitors. So a static phase converter switches some caps
out after the motor is spinning but leaves one or more connected. You
can spin up a three phase motor with another motor or even a rope
wrapped around the shaft and once the motor is spinning fast enough
connect it to single phase power and it will continue to spin. Part of
the reason for this is because a motor is also a generator whenever it
is powered up and spinning. The reverse is also true-a generator is
also acting as a motor when it is working. Three phase transformers,
on the other hand, don't need to be started and so a static phase
converter would probably be useless for a three phase welder. The
phase shift caps might help a bit, I don't know. Caps can be used to
help improve the power factor of a three phase welder but for a
residental application would not make a difference in what you pay for
power. As an aside, some three phase welders can be connected to
single phase power, using only two legs of the three. The welder
output then needs to be derated by a certain amount. The welder maker
would have that data.
Hi ETPM Thanks for the Inteliget lead.I need too find the wireing books on three
phase welders and the welders that run on both 1 & 3 phase too learn the wireing
differences,Any clues as for the best way too get some simlefied
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