Quote:
Originally Posted by ol'George
The windings are like that of a transformer, if you remove a transformers core the windings will overheat.
Same as the induction windings of the pto.
remove the disc and the windings overheat.
The disc becomes the core.
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I can agree with your theory, but this is not a transformer. Widening the air gap is not removing any core.
Per Mr. Bedells drawing, applying power to the field coil (#1) turns the drive disc (#2) which does not move (except for rotation with the crank) into an electromagnet. When that happens the, the driven disc (3) which has the pulley, is attracted to the drive disc, closes the air gap and rotates with the rotating drive disc and you cut grass. Sorry, but I just can't see how a change in the air gap can affect the amount of current flowing through the field coil.