"Ian W. Wright" wrote:
From: "Ian W. Wright" <Ian@...>
Thanks Jon but let me just get it clear. Are you saying that if you put,
say, the high voltage winding of a mains transformer in series with the
low voltage motor, it will boost its starting torque?
No. What is similar to the low voltage winding of a mains transformer
would be put in series with the AC output of the real mains transformer,
before the rectifiers. This would lower the current flowing through the
rectifier, and bring down the DC voltage at the capacitors after the
rectifier.
So, the mag amp goes into the power supply, and is not connected
to the motor. Also, a mains transformer would likely make a poor
mag amp. Special magnetic laminations much different from ordinary
transformer iron would be used. Also, the control winding would
be wound with LOTS of turns of fine wire, to minimize power
demand to saturate the iron.
I hope this helps clear it up. Anyway, there are much better ways
to do this, today. A chopper-type stepper drive is cheaper,
more efficient, probably more reliable, more responsive, a
LOT smaller and lighter, etc.
Jon
