Answer Posted / andrew cottrell

Of course, the proof of the pudding is in the eating. One has to experiment & see.
But I would guess that the motor would NOT necessarily speed up. Because the motor is coupled to a driven machine which provides a resistance to speed change. I think that the danger lies in a transient over voltage due to the collapse of the flux. This could stress the insulation, and/or cause a flash over across the mica, and therefore between brushes... BUT, I don't know!! I am guessing!

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