In article , Gary Coffman says...

In summary, during starting, the load motor back EMF is small, so
significant current flows on the wild leg, properly starting the motor.
While running at speed with no load, wild leg current will be small,

Actually, for the driven motor running at speed with no load, *all*
the currents will be nearly zero. Granted an amp-clamp will show
some larger value, but once again that is reactive current.

Measuring the in-phase currents on all three legs of the driven
motor, with no mechanical load, will probably yeild nearly
equal values. SWAG.

Jim


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