US PATENT SUBCLASS 318 / 706
.~.~ With armature power removal upon failure to synchronize or loss of synchronism

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

700  DF  SYNCHRONOUS MOTOR SYSTEMS {7}
705  DF  .~ Synchronization systems {4}
706.~.~ With armature power removal upon failure to synchronize or loss of synchronism {2}
707  DF  .~.~.~> Upon failure to resynchronize
708  DF  .~.~.~> Responsive to thermal electrical element in system

DEFINITION

Classification: 318/706

With armature power removal upon failure to synchronize or loss of synchronism:

(under subclass 705) Subject matter wherein the system includes an alternating current circuit having a switching means to apply ac power to the AC winding of the motor and means responsive to some condition of the energized motor related to the operation of the motor at subsynchronous speed to control the switching means to de-energize the ac winding of the motor upon failure of the motor to achieve or maintain rotation at the speed of the rotating magnetic field.

SEE OR SEARCH THIS CLASS, SUBCLASS:

445, and the subclasses specified in the notes thereto for automatic control of other electric motors including automatic starting and/or stopping of electric motors.

519, for armature circuit control of electric motor system generally by the making and/or braking of the motor armature circuit.