US PATENT SUBCLASS 318 / 449
.~ With respect to a fixed standard, master or reference device

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

445  DF  AUTOMATIC AND/OR WITH TIME-DELAY MEANS (E.G., AUTOMATIC STARTING AND/OR STOPPING) {20}
449.~ With respect to a fixed standard, master or reference device {2}
450  DF  .~.~> Electrical detector
451  DF  .~.~> Mechanically vibrating device as reference device (e.g., tuning fork)

DEFINITION

Classification: 318/449

(under subclass 445) Subject matter in which means are provided for producing a force, motion, or other quantitative characteristic constituting a standard, master, or reference value or quantity, in combination with means for comparing such value or quantity with a value or quantity of a corresponding characteristic derived from or as a result of the operation of the motor to be controlled, and for controlling the motor in accordance with the magnitude or variations in magnitude of the resultant of the compared values or quantities.

SEE OR SEARCH THIS CLASS, SUBCLASS:

18, for electric motor follow-up systems in which when the "transmitter" is operated continuously the follow-up motor may vary in speed (see particularly subclass 23) in accordance with variations in the speed of operation of the transmitter which thus acts as a standard or reference device.

69, for plural motor systems having means for controlling the relative speed of two or more electric motors wherein a speed difference detector is employed for comparing the relative speeds of the motor with respect to each other and means are provided responsive to the speed difference detector for controlling the speed of one motor relative to that of another.

77, for plural motor systems in which means responsive to the speed of one motor constitutes a speed controlling means for another motor.

329, for motor systems having means to control the motor running-speed in response to the speed or frequency of any master device other than the source of supply for the armature circuit.

SEE OR SEARCH CLASS

322, Electricity: Single Generator Systems,

36, for generator control with respect to a standard master or reference device.