US PATENT SUBCLASS 318 / 71
.~.~.~.~.~ Voltage and/or current difference detector

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

34  DF  PLURAL, DIVERSE OR DIVERSELY CONTROLLED ELECTRIC MOTORS {22}
66  DF  .~ Running-speed control {4}
68  DF  .~.~ Relative motor speed control {5}
69  DF  .~.~.~ With speed-difference detector {2}
70  DF  .~.~.~.~ Electrical-type detectors {4}
71.~.~.~.~.~ Voltage and/or current difference detector

DEFINITION

Classification: 318/71

(under subclass 70) Subject matter in which each of two or more of the motors is provided with means for generating electrical voltages and/or currents or is provided with means for controlling a separate voltage or current, the detecting or sensing means being operated by the difference in magnitude between the two separately generated or controlled voltages or currents.

SEE OR SEARCH THIS CLASS, SUBCLASS:

41+, for plural motor systems where there are electrical synchronizing connections between a plurality or the motors.