We were starting a 4160 motor that wouldn't meg clear. The motor shop had us dry out the windings by shorting a welder through the windings for about three days.
We were starting a 4160 motor that wouldn't meg clear. The motor shop had us dry out the windings by shorting a welder through the windings for about three days.
With a high air-flow it works great on wound equipment. Transformers, too. Separate the windings and hook a welder to each one.
For really large rotating equipment where a welder can't produce enough heat, like a big synchronous generator, the MO is to short circuit all three phases put in over-temp and overcurrent protection, and actually use a big welder to provide low-voltage excitation while the unit is rolled.
You create short-circuit current in your stator at basically no voltage and it will dry itself.
The danger being obviously if you over-excite or over-speed your protection had darn well better work or you can burn the unit up. But sometimes it's the only way.
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