US PATENT SUBCLASS 318 / 707
.~.~.~ Upon failure to resynchronize

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  DF  .~.~ With armature power removal upon failure to synchronize or loss of synchronism {2}
707.~.~.~ Upon failure to resynchronize

DEFINITION

Classification: 318/707

Upon failure to resynchronize:

(under subclass 706) Subject matter which includes a second switching means in the circuit connected to the field winding, the means responsive to a condition of the energized motor detecting the failure of the motor to synchronize and controlling the second switching means to remove the DC power from the field and to reapply power to the field a predetermined number of times and controlling the first switching means to remove power from the AC winding of the motor if the motor still does not synchronize.

SEE OR SEARCH THIS CLASS, SUBCLASS:

437, and the subclasses specified in the notes thereto, for motor systems having means for phasing nonsynchronous motors.

SEE OR SEARCH CLASS

307, Electrical Transmission or Interconnection Systems,

85+, for systems of interconnecting plural supply circuits or

plural generators for synchronous operation.