US PATENT SUBCLASS 318 / 717
.~.~ Responsive to a motor condition

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

700  DF  SYNCHRONOUS MOTOR SYSTEMS {7}
716  DF  .~ Field winding circuits {1}
717.~.~ Responsive to a motor condition {2}
718  DF  .~.~.~> Induced voltage in field winding
719  DF  .~.~.~> Speed responsive field power sources

DEFINITION

Classification: 318/717

Responsive to a motor condition:

(under subclass 716) Subject matter wherein the field winding circuit is controlled by some condition of the motor.

(1) Note. Motor conditions of this subclass type include, for example, current in the motor, power factor in the motor, the power taken by the motor, and the speed of the motor.

SEE OR SEARCH THIS CLASS, SUBCLASS:

453+, for generally controlling a motor in response to plural conditions one of which may be an electrical condition.

459, for generally controlling a motor in response to terminal voltage or counterelectromotive force of controlled motor.

471, for generally controlling a motor in response to thermal conditions of the motor control means or in or about the motor.

474+, for generally controlling motor in response to armature or secondary circuit current in the motor. 708, for synchronous motor synchronization systems responsive to a thermal electric element in the system to control the armature power removal upon failure to synchronize or loss of synchronization.

713, for synchronous motor synchronizing systems responsive to slip voltage frequency in the DC field winding to control excitation of field winding.

714, for synchronous motor synchronization systems responsive to motor armature current to control excitation of motor field winding.

715, for synchronous motor synchronization systems responsive to motor rotor speed or driven member to control excitation of the motor field winding.