US PATENT SUBCLASS 318 / 656
.~.~.~ Differential transformer systems

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

560  DF  POSITIONAL SERVO SYSTEMS (E.G., SERVOMECHANISMS) {23}
638  DF  .~ With particular "error-detecting" means {13}
652  DF  .~.~ With particular position measuring instruments {7}
656.~.~.~ Differential transformer systems {5}
657  DF  .~.~.~.~> Linear differential transformer
658  DF  .~.~.~.~> "E" type transformer
659  DF  .~.~.~.~> "Microsyn" type
660  DF  .~.~.~.~> "Inductosyn" systems
661  DF  .~.~.~.~> Resolver systems

DEFINITION

Classification: 318/656

Subject matter under subclasses 652 in which the particular position measuring instrument is a differential transformer. A differential transformer is a position indicating transformer with at least one primary winding and a plurality of secondary windings, the secondary windings are in bucking or aiding relationship. Some portion of the magnetic circuit of the transformer will affect the coupling of the secondary windings in responses to position and the secondary windings will give a voltage indication of the position sensed.

SEE OR SEARCH CLASS

336, Inductor Devices,

115+, for inductor devices of the relatively movable core and coil type.