US PATENT SUBCLASS 335 / 245
.~.~.~.~ Shading coil

Current as of: June, 1999
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335 /   HD   ELECTRICITY: MAGNETICALLY OPERATED SWITCHES, MAGNETS, AND ELECTROMAGNETS

209  DF  MAGNETS AND ELECTROMAGNETS {10}
220  DF  .~ With magneto-mechanical motive device (e.g., electromagnet with armature) {21}
243  DF  .~.~ Alternating current type {5}
244  DF  .~.~.~ Flux phase displacement or varying means {2}
245.~.~.~.~ Shading coil

DEFINITION

Classification: 335/245

(under subclass 244) Subject matter wherein the flux phase displacement is obtained by the use of a shading coil.

(1) Note. A shading coil is a short-circuited coil in which the circulating current lags behind the flux which induces the current.

SEE OR SEARCH THIS CLASS, SUBCLASS:

104, for switches with chatter or noise preventing means which may include shading coils.

247, for electromagnets with chatter or noise preventing means including shading coils.

SEE OR SEARCH CLASS 310, Electrical Generator or Motor Structure,

172, for alternating current dynamoelectric devices with shading means.

361, Electricity: Electrical Systems and Devices,

139+, for electric circuits for alternating current electromagnets with shading coils.