US PATENT SUBCLASS 318 / 705
.~ Synchronization systems

Current as of: June, 1999
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318 /   HD   ELECTRICITY: MOTIVE POWER SYSTEMS

700  DF  SYNCHRONOUS MOTOR SYSTEMS {7}
705.~ Synchronization systems {4}
706  DF  .~.~> With armature power removal upon failure to synchronize or loss of synchronism {2}
709  DF  .~.~> Having different armature voltage prior to synchronism
710  DF  .~.~> With d.c. field removal {1}
712  DF  .~.~> With field excitation application {3}

DEFINITION

Classification: 318/705

Synchronization systems:

(under subclass 700) Subject matter wherein the motor includes an alternating current winding and a field winding and the system includes an alternating current circuit connected to the alternating current winding of the motor to generate a rotating electromagnetic field, means to rotate the motor near synchronous speed and a circuit connected to the field winding of the motor to form a direct current magnetic field when the motor is rotating at near-synchronous speed so that the direct current field being attracted to the rotating magnetic field of the motor will rotate the motor at the speed of the rotating field.

(1) Note. As used in this subclass group, the term "synchronization" refers to the changing over of the operation of the synchronous motor from mechanical rotation by any means to rotation by the rotating magnetic field of the motor at the speed of the rotating field.

SEE OR SEARCH THIS CLASS, SUBCLASS:

700, for synchronous motor systems which may include the primary or armature motor circuit and the field excitation circuit where synchronization is not claimed.

716+, for synchronous motor field circuits where no armature or alternating current circuits are also claimed.

720+, for synchronous motor armature or primary circuits where no field circuit is also claimed.