US PATENT SUBCLASS 310 / 181
.~.~.~.~ Combined permanent and electromagnet

Current as of: June, 1999
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310 /   HD   ELECTRICAL GENERATOR OR MOTOR STRUCTURE

10  DF  DYNAMOELECTRIC {5}
40 R  DF  .~ Rotary {28}
179  DF  .~.~ Windings and core structure {7}
180  DF  .~.~.~ Field or excitation windings or structure {9}
181.~.~.~.~ Combined permanent and electromagnet

DEFINITION

Classification: 310/181

(under subclass 180) Subject matter having a combined permanent and electromagnet.

SEE OR SEARCH THIS CLASS, SUBCLASS:

152+, for permanent magnet machines.

SEE OR SEARCH CLASS

322, Electricity: Single Generator Systems,

46, for generator control systems in which the generator has a combined permanent and wound field structure. 335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,

229+, for devices with electromagnets combined with permanent magnets having an armature.