US PATENT SUBCLASS 318 / 140
GENERATOR-FED MOTOR SYSTEMS HAVING GENERATOR CONTROL

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

140GENERATOR-FED MOTOR SYSTEMS HAVING GENERATOR CONTROL {9}
141  DF  .~> Automatic generator control and/or with time-delay means {5}
148  DF  .~> Alternating-current-motor system
149  DF  .~> With plural, diverse or diversely controlled generators
150  DF  .~> With flywheel on generator or on motor
151  DF  .~> Control of both the generator and the circuit to the motor {1}
153  DF  .~> Control of both the generator and the motor {1}
156  DF  .~> Plural, diverse or diversely actuated, generator control means
157  DF  .~> Generator speed control
158  DF  .~> Generator field circuit control

DEFINITION

Classification: 318/140

(under the class definition) Subject matter in which an electric generator is provided for supplying electric energy to the armature or primary circuit of an electric motor and in which means are also provided for controlling the generator to thereby control the operation of the electric motor.

(1) Note. An "electric generator" includes any means for converting nonelectrical energy into electrical energy. Thus it includes photo-electric and thermoelectric generators, primary or secondary batteries, etc.

(2) Note. Where more than one generator is provided to supply the energy, means must be provided for controlling each generator. See subclasses 440+ where no means are provided for controlling one of the generators.

(3) Note. Where the only generator control means comprises

means connected in the circuit between the generator terminals and the motor terminals, classification is not in this or its indented subclasses but in some other appropriate subclass in the class.

(4) Note. Mere inherent regulation of the generator (i.e., regulation of the output of the generator resulting merely from structural features of the generator) is not sufficient basis for classification herein except in those instances where the regulation functions to substantially vary the operation of the motor. Thus a flat-compounded generator operates to produce a substantially constant output voltage with varying load and, hence, performs or produces no regulating function on the motor other than would any constant voltage source. Likewise, the proportion of parts and airgaps, degree of excitation, resistance of the several conductive elements of the generator, etc., are instrumental in determining the operating characteristics of the generator and generally tend toward generator operating characteristics which have no particular effect on the operation of the motor supplied thereby other than to supply a source of energy, the voltage variation of which is not substantially disadvantageous. However, a series-generator, or a decidedly over-compounded or a decidedly under-compounded generator, or one with a differentially wound series field exciting winding may have operating characteristics which very materially varies the operation of the motor with changes in motor load. This type of regulation is considered sufficient basis for classification herein. Any control or regulating means for maintaining constant current or power output from the generator with a varying motor load, by generator control, is sufficient basis for classification herein.

(5) Note. Means for "controlling the generator" include means for varying the speed of the generator by controlling the driving means therefor, or for adjusting the structure of the generator. (6) Note. Means for controlling excitation of AC generator (supplying energy to primary circuit of synchronous motor) in response to motor primary circuit current to control pullout torque or to "stiffen the coupling between the generator and motor" is included herein.

SEE OR SEARCH THIS CLASS, SUBCLASS:

139, for this subject matter for motor systems having electric batteries for supplying electric energy to the motor.

440, see Note 2 above.

SEE OR SEARCH CLASS

322, Electricity: Single Generator Systems, for generator control of general application. The appropriate subclass or subclasses would depend on the particular generator control

involved.