US PATENT SUBCLASS 318 / 72
.~.~.~.~.~ Dynamoelectric machine detector

Current as of: June, 1999
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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}
72.~.~.~.~.~ Dynamoelectric machine detector

DEFINITION

Classification: 318/72

(under subclass 70) Subject matter in which a dynamoelectric machine is provided for sensing or detecting the difference in speed between two or more motors.

(1) Note. A common arrangement of a dynamoelectric machines as a detector comprises connecting the armature structure thereof to one motor and the field structure thereof to another motor with the result that when the motors run at the same speed both parts of the dynamoelectric machine will operate at the same speed and, no e.m.f. will be generated in the machine. When the motors operate at different speeds, the parts of the dynamoelectric machine will have relative motion with respect to each other and will generate an e.m.f. which will have a magnitude which is proportional to the magnitude of the difference in speeds of the two parts of the dynamoelectric machine.