[Boatanchors] Are 400 Hz variac's good for anything but a real 'boat anchor'

J. Forster jfor at quik.com
Mon Jul 18 10:58:38 EDT 2011

The statement is true. In a properly designed 400 Hz transformer operating
at the rated voltage, the iron is not being saturated during any part of
the cycle.

If you go to 60 Hz with the same applied voltage, the iron will be
hopelessly saturated, and it's incremental permeability will drop to near
that of free space. It's like the iron just vanished.

The magnetizing current will go up far, far more tha 7x.




> "The magnetizing current @60 Hz will *much* higher than 7 times the
> current
> at 400Hz."
> Please explain- justify.
> I agree with the 7:1 guys on this. 
> Basically the issue arises in the electronic speed/torque control of
> induction motors.    Bruce   KJ3Z

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