US PATENT SUBCLASS 318 / 727
INDUCTION MOTOR SYSTEMS

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

727INDUCTION MOTOR SYSTEMS {12}
728  DF  .~> Repulsion start
729  DF  .~> Power-factor control
730  DF  .~> With plural separately movable rotors
731  DF  .~> With voltage source connected to motor secondary {3}
737  DF  .~> Self-cascaded motor windings
738  DF  .~> With commutated winding
739  DF  .~> Reversing {5}
757  DF  .~> Braking {4}
766  DF  .~> Primary and secondary circuits
767  DF  .~> Primary circuit control {9}
818  DF  .~> Secondary circuit control {3}
830  DF  .~> With relatively movable cooperating motor parts to control energized motor {2}

DEFINITION

Classification: 318/727

INDUCTION MOTOR SYSTEMS:

(under the class definition) Subject matter wherein the system of supply and/or control is for an induction motor.

(1) Note. See Induction motors of the class definition for the definition of "induction motor" as used in the titles and definition of this subclass and of the subclasses indented hereunder.

(2) Note. In this subclass and those indented hereunder, where only one of the two conductors [see Class Definition, Glossary, "Induction Motors"] rotates relative to the motor supporting structure, that conductor and the motor structure rotating with it is referred to in the title and definitions as the "rotor", and the fixed part of the motor is referred to as the "stator".

(3) Note. Nominal recitation of an induction motor (i.e., by name only) is an insufficient basis for classification in this subclass or the subclasses indented hereunder. For classification in this subclass or in the subclasses indented hereunder, some electrical or structural characteristic of induction motors (e.g., "secondary winding", "induced current winding") must be recited.

(4) Note. The induction motors included in the systems classifiable in this subclass or in the subclasses indented hereunder must be of the type which rotate continuously for at least one complete revolution (360 deg.). For motors which rotate continuously for less than one complete revolution ("stepping motors") see the note to subclass 696 of this class in the search notes below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

44, for motor systems having two or more induction motors with synchronizing interconnections between the induction motor secondaries.

49+, for electrically cascaded motors one or more of which are induction motors. 121, for motor systems having reciprocating motors which operate on the principle of the induction motor.

135, for motor systems having linear movement motors which operate on the principle of the induction motor.

148, for induction motors which are supplied by alternating current generators, the generators being provided with

generator control means.

696, for stepping motors.

700+, for synchronous motor systems where the motor is provided with means for starting and/or accelerating the motor as an induction motor.

725+, for repulsion motors.

SEE OR SEARCH CLASS

310, Electrical Generator or Motor Structure,

166+, for the structure of induction motors.