US PATENT SUBCLASS 318 / 712
.~.~ With field excitation application

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


318 /   HD   ELECTRICITY: MOTIVE POWER SYSTEMS

700  DF  SYNCHRONOUS MOTOR SYSTEMS {7}
705  DF  .~ Synchronization systems {4}
712.~.~ With field excitation application {3}
713  DF  .~.~.~> Responsive to slip voltage frequency in d.c. field winding
714  DF  .~.~.~> Responsive to armature current
715  DF  .~.~.~> Responsive to rotor speed or rotor driven member

DEFINITION

Classification: 318/712

With field excitation application:

(under subclass 705) Subject matter wherein the circuit connected to the field winding includes switching means to connect a direct current source of power to the field winding of the motor.

(1) Note. Subject matter of this subclass type includes electromagnetic and electronic switches.

SEE OR SEARCH THIS CLASS, SUBCLASS:

536+, for general motor field or secondary circuit control by making or braking the circuit.

710+, for synchronous motor synchronization systems including means to remove the direct current excitation of the field circuitry.

716+, for synchronous motor field excitation circuits only with means to apply or remove the excitation from the circuits.