On Sun, 23 Sep 2012 11:12:22 -0700, Cross-Slide wrote:

I remember reading a book about motors, and one of the more
interesting
ones was referred to as a "Printed Pole Motor" IIRC.

This motor had multiple salient poles on the rotor, and they could be
re-magnetized as they passed one location of the stator.
This allowed the pole count of the rotor to be dynamically changed by
re-printing some of the salient poles to create larger or smaller
groups
of North or South poles in succession around the rotor.

I think they were intended for very large motors for ball mills or
some
large mining operations, of low speed, and thus many poles around the
rotors.
Also, it was suggested that since the poles could be re-written as the
motor ran, there could be theoretically non-integer numbers of poles
around the rotor, as they could be dynamically printed to match the
required speed.

Google cannot find any information on this...

Did I forget the actual name of this class of motor?


I believe you may be thinking of a "Written Pole Motor"

They offer some advantages for motors in the 10 to 100 HP range when
single phase power must be used. I recall them as being relatively
expensive.

WayneJ