.~.~> Impedance in series with field windings and in parallel to armature winding
DEFINITION
Classification: 318/249
(under subclass 246) Subject matter in which impedance means are provided for controlling the series motor circuits.
(1) Note. Space-discharge devices (including grid controlled vacuum tubes and gas-filled or vapor-filled tubes) are considered impedance devices when used to regulate the magnitude of current flow in a circuit having a source of electric voltage connected therein.
SEE OR SEARCH THIS CLASS, SUBCLASS:
493, and the subclasses specified in the Search Notes thereto, for other motor systems controlled by means of
impedance devices in the armature and field circuits of the motors.
508, and the subclasses specified in the Notes thereto, for motor systems controlled by means of an impedance in the armature circuit.
533, and the subclasses specified in the Notes thereto for motor systems controlled by means of an impedance in the field circuit. SEE OR SEARCH CLASS
323, Electricity: Power Supply or Regulation Systems,
