(under subclass 494) Subject matter in which means are provided for controlling the magnitude of the voltage supplied to the armature or primary circuit of the motor being controlled.
(1) Note. When the voltage is controlled by means of impedance means (such as space-discharge devices, resistors, inductors and capacitors merely connected in series or in parallel, but not in series and in parallel simultaneously-,) which do not form a voltage divider with respect to the motor armature, classification is not herein, but in some other subclass herein below. Note subclasses 505 and 508.
(2) Note. Where voltage is controlled only by means of circuit making and breaking of the armature or primary circuit, classification is not herein but is in subclass 519 below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
49, for plural motor systems having cascade or tandem connected motors in which the voltage supplied to the second motor depends on the speed or slip of the first motor.
139, for motor systems in which primary or secondary-batteries are employed to supply to armature current. 140, for generator-fed motor systems wherein the generator is controlled to control the current supplied to the motor armature.
500, and the subclasses specified in the Notes thereto for this subject matter where the voltage control is effected by a plurality of sources of supply for the armature circuit.
505, see Note 1 above with respect to space-discharge devices in the primary circuit.
508, see Note 1 above with respect to impedances in the primary circuit.
519, see Note 2 above.
812, for primary circuit voltage control in induction motor systems.
SEE OR SEARCH CLASS
290, Prime-Mover Dynamo Plants, appropriate subclasses for variable voltage generating systems having nonelectric prime mover control.
310, Electrical Generator or Motor Structure,
129, for variable voltage rotary converters, per se.
320, Electricity: Battery or Capacitor Charging or Discharging, appropriate subclass for a variable voltage supply for a battery or condenser charging or discharging system. 322, Electricity: Single Generator Systems, appropriate subclasses, for variable voltage generating system, per se.
323, Electricity: Power Supply or Regulation Systems,
220, 354 for variable voltage supply systems, per se.
363, Electric Power Conversion Systems,
13+, and the subclasses mentioned in the notes thereto for variable voltage current conversion systems.
