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Re: Permanent magnet Tesla coil

Original poster: Steve Conner <steve@xxxxxxxxxxxx>


I have some larger bus alternators that use
this principle. The pole face rotor looks like a set
of  separated hands with the fingers spead apart to
allow alternating fingers and air gaps in a circle.

I have to disagree. Every alternator I've ever seen is made that way. The two sets of "fingers" have a field coil inside, and the result is just a regular synchronous alternator, but easier to manufacture than the classic method where you start with a steel cylinder, cut multiple slots, wind on a complex multi-pole field winding, and worry about keeping it in place at high RPM.

It would be interesting to see if you could drive a regular car or truck alternator as a reluctance one. You would dump lots of DC through the stator windings via a large choke and leave the field winding open. An AC output (at twice the normal frequency?) should appear across the stator winding. The rotor would probably overheat since it's a solid steel part, not laminated.

Steve Conner