US PATENT SUBCLASS 318 / 494
ARMATURE (OR PRIMARY) CIRCUIT CONTROL

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

494ARMATURE (OR PRIMARY) CIRCUIT CONTROL {9}
495  DF  .~> Plural, diverse or diversely controlled, armature or primary windings {4}
500  DF  .~> Plural sources of voltage (including counter e.m.f. cells)
501  DF  .~> By shunting armature or primary winding
502  DF  .~> Variable length or tapped armature winding
503  DF  .~> Frequency or pulsation control
504  DF  .~> Voltage control
505  DF  .~> By means to space-discharge devices {2}
508  DF  .~> Impedance-controlled {4}
519  DF  .~> By armature or primary circuit-making and/or breaking {1}

DEFINITION

Classification: 318/494

(under the class definition) Subject matter in which means are provided for controlling the armature or primary circuit of the motor.

SEE OR SEARCH THIS CLASS, SUBCLASS:

82, and the subclasses specified in the Notes thereto for this subject matter in plural motor systems having running-speed control.

94, for this subject matter in plural motor systems having acceleration control.

104, for this subject matter in plural motor systems having starting and/or stopping control.

105, for this subject matter in plural motor systems having plural sources of operational supply for the motors.

111, for this subject matter in plural motor systems having series-parallel connected motors. 112, for this subject matter in plural motor systems having parallel-connected motors.

113, for this subject matter in plural motor systems having series connected motors.

126, for this subject matter where the control is of the energizing circuit of a reciprocating or oscillating motor.

138, for this subject matter where the system has space-discharge-device for commutating the motor.

139, for this subject matter where the motor is supplied by primary or secondary batteries.

140, for this subject matter where the motor is supplied by an electric generator, the generator output being controlled to control the motor.

246, for this subject matter where the motor is a series motor.

254, for this subject matter where the motor is a self-commutated impulse or reluctance motor.

287, for this subject matter for the control of motor-reversing systems.

373, for this subject matter where the control is for

"plugging" or is the application of reverse power to the motor for braking the motor.

375, for this subject matter where the control is for dynamic braking of the motor. 430, for this subject matter where the armature current is controlled during the starting or stopping period.

432, for this subject matter where the system includes means to maintain the armature current approximately constant.

434, for this subject matter where the system includes means to prevent the armature current from either exceeding a maximum value or diminishing below a minimum value.

436, for this subject matter where the system includes means for energizing a motor while not in motion.

438, for this subject matter where the system includes means to the power factor of the armature or line circuit.

439, for motor commutation control systems.

440, for this subject matter where there are plural sources of supply for a single motor.

474, and the subclasses specified in the Notes to the definition of those subclasses for this subject matter where the system has automatic means to control the armature circuit or has means to effect a time delay in the operation of the armature circuit control means.

493, and the subclasses specified in the Search Notes thereto, for armature or primary circuit control of an electric motor combined with the field or secondary control thereof.

720, and the subclasses specified in the Notes to the definition of that subclass where the motor is a synchronous motor.

767, and the subclasses specified in the Notes to the definition of that subclass where the motor is an induction motor.

SEE OR SEARCH CLASS 388, Electricity: Motor Control Systems,

809+, 816+, 828+, and 830+ for control of the armature circuit only in single motor running-speed control systems with, and without, feedback respectively; and subclasses 844+ and 853+ for similar control in single motor acceleration control systems.