US PATENT SUBCLASS 322 / 75
.~.~ Control by circuit impedance

Current as of: June, 1999
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322 /   HD   ELECTRICITY: SINGLE GENERATOR SYSTEMS

44  DF  GENERATOR CONTROL {11}
59  DF  .~ With excitation winding and/or circuit control {11}
75.~.~ Control by circuit impedance {3}
76  DF  .~.~.~> Plural impedances {2}
79  DF  .~.~.~> Unidirectionally conductive
80  DF  .~.~.~> Resistance {3}

DEFINITION

Classification: 322/75

(under subclass 59) Subject matter wherein the excitation of the generator is controlled by means of impedance in the excitation circuit.

SEE OR SEARCH THIS CLASS, SUBCLASS:

72, for generator field control by means of space discharge devices. Under some conditions, a space discharge device may be used as an impedance and subclasses 72+ should be searched for such systems.

SEE OR SEARCH CLASS

318, Electricity: Motive Power Systems,

249+, for series motor control by means of motor circuit impedance, and subclasses 534+ and 533+, for motor control by field circuit impedance, subclasses 700+ for synchronous motor control, particularly subclasses 710+ for field circuit control by means of impedance; subclass 784 for impedance control of the induction motor primary circuit during starting; subclass 792 for single phase start winding removal control circuit which includes a variable temperature coefficient impedance in circuit; subclasses 794+ for split phase capacitor motor circuits; subclass 796 for split phase capacitor motor circuits including a saturable winding in the circuits; subclass 797 for split phase motor circuits using saturable winding in the circuits; subclass 804 for induction motor primary circuits responsive to speed or rotation phase angle with controlled magnetic reactance in circuits; subclasses 814+ for voltage control of induction motor primary circuit by impedance; subclasses 816+ for split phase induction motors with voltage control of primary circuit by impedance; subclasses 821+ for induction motor control with impedance in secondary circuit. 320, Electricity: Battery or Capacitor Charging or Discharging, appropriate subclasses, particularly

123, for a battery or capacitor charging or discharging system including a generator.

323, Electricity: Power Supply or Regulation Systems,

364, for impedance systems in general.

338, Electrical Resistors,

68+, for mechanically variable electrical resistors such as rheostats.

361, Electricity: Electrical Systems and Devices,

277+, for variable condensers.

388, Electricity: Motor Control Systems,

800+, and 825+ for motor speed control systems and 842+ and 848+ for motor acceleration control systems including selectable or variable impedance devices.