US PATENT SUBCLASS 318 / 68
.~.~ Relative motor speed control

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.~.~ Relative motor speed control {5}
69  DF  .~.~.~> With speed-difference detector {2}
77  DF  .~.~.~> Controlling motor speed in response to speed of another motor {1}
79  DF  .~.~.~> Control of both armature (or primary) and field (or secondary) circuits
80  DF  .~.~.~> Armature or primary circuit control
81  DF  .~.~.~> Field secondary circuit control

DEFINITION

Classification: 318/68

(under subclass 66) Subject matter in which means are provided for controlling or regulating the speed of one or more electric motors relative to the speed of one or more other electric motors.

(1) Note. This or the indented subclasses do not include systems where the running speed of all the motors is controlled as a group.

SEE OR SEARCH THIS CLASS, SUBCLASS:

41+, for this subject matter where there are electrical synchronizing connections between a plurality of motors so that when the speed of one motor changes with respect to another motor, one of the motors will act either as a prime mover for a generator or as a generator to supply electric energy to the other motor.

45+, for plural motor systems where the motors have the driving members coupled mechanically together.

52, for this subject matter where means are provided for reducing the speed of or reducing the electric energy supplied to a motor when such motor is "slipping" or racing.

90+, for plural motor systems where the acceleration and/or deceleration of one motor may be related to the acceleration and/or deceleration of another motor. SEE OR SEARCH CLASS

60, Power Plants,

700, for plural motors of other types in which the speed of one or more motors may be controlled with reference to the speed of one or more other motors.

91, Motors: Expansible Chamber Type,

511+, for controlling one expansible chamber motor in response to a condition of another.

290, Prime-Mover Dynamo Plants,

4, for plural prime movers one of which is nonelectric, driving electric generators in which the speed of one or more prime movers may be controlled relative to speed of one or more other prime movers.