Class   388	ELECTRICITY: MOTOR CONTROL SYSTEMS
	Click here to view a PDF version of this file

This Class 388 is considered to be an integral part of Class 318 (see the Class 318 schedule for the two positions of this Class in schedule hierarchy). This Class retains all pertinent definitions and class lines of Class 318.

800

CLOSED LOOP SPEED CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR

801

. (1 indent ) Field control, or field and armature control, by digital or combined analog and digital circuitry

803

. (1 indent ) Field control, or field and armature control, by analog (only) circuitry

804

.. (2 indent ) By pulse width or duty cycle modification

805

.. (2 indent ) By phase or frequency modification

806

.. (2 indent ) By voltage or current modification

807

... (3 indent ) With variable impedance

808

.. (2 indent ) By selection of windings

809

. (1 indent ) Armature control by digital or combined analog and digital circuitry

811

.. (2 indent ) By pulse width or duty cycle modification

812

.. (2 indent ) By phase and frequency modification

813

.. (2 indent ) By phase modification

814

.. (2 indent ) By frequency modification

815

.. (2 indent ) By voltage or current modification

816

. (1 indent ) Analog armature control

819

.. (2 indent ) By pulse width or duty cycle modification

820

.. (2 indent ) By phase or frequency modification

821

.. (2 indent ) By voltage and current modification

822

.. (2 indent ) By voltage modification

823

.. (2 indent ) By current modification

824

.. (2 indent ) By variable impedance (e.g., potentiometer)

825

OPEN LOOP SPEED CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR

826

. (1 indent ) Field control, or field and armature control

827

.. (2 indent ) With plural selectable speeds (e.g., manual switch)

828

. (1 indent ) Armature control by digital or combined analog and digital circuitry

829

.. (2 indent ) By pulse width or duty cycle modification

830

. (1 indent ) Analog armature control

831

.. (2 indent ) By pulse width or duty cycle modification

832

.. (2 indent ) By frequency modification

833

.. (2 indent ) By voltage or current modification

834

.. (2 indent ) By selection of windings

835

.. (2 indent ) By control of motor structure

836

... (3 indent ) Position or number of brushes

837

.. (2 indent ) By periodic mechanical switch

838

.. (2 indent ) With plural selectable speeds (e.g., with manual switch, potentiometer

839

... (3 indent ) By selecting impedance

840

.... (4 indent ) Resistive

841

.... (4 indent ) Inductive

842

CLOSED LOOP ACCELERATION CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR

843

. (1 indent ) Field control, or field and armature control

844

. (1 indent ) Armature control

847

.. (2 indent ) By voltage or current modification

848

OPEN LOOP ACCELERATION CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR

849

. (1 indent ) Field control, or field and armature control

850

.. (2 indent ) By transformer or inductive device

851

.. (2 indent ) By patterned switch

852

.. (2 indent ) By insertion of resistance

853

. (1 indent ) Armature control

854

.. (2 indent ) By voltage or current modification

855

.. (2 indent ) By selectable or variable impedance

856

... (3 indent ) By insertion of resistance or shorting of circuit

857

.... (4 indent ) With relay

858

....• (5 indent ) Time delay relay

859

.... (4 indent ) With patterned switch

860

... (3 indent ) Manual

	CROSS-REFERENCE ART COLLECTIONS

900

SPECIFIC SYSTEM OPERATIONAL FEATURE

901

. (1 indent ) Sample and hold

902

. (1 indent ) Compensation

903

. (1 indent ) Protective (e.g., voltage or current limit)

904

. (1 indent ) Stored velocity profile

905

. (1 indent ) Armature and field windings connected in series (i.e., series motor)

906

. (1 indent ) Proportional-integral system

907

SPECIFIC CONTROL CIRCUIT ELEMENT OR DEVICE

907.2

. (1 indent ) Bridge circuit

907.5

. (1 indent ) Computer or microprocessor

908

. (1 indent ) Frequency to voltage converter

909

. (1 indent ) Monitoring means

910

. (1 indent ) Operational/differential amplifier

911

. (1 indent ) Phase locked loop

912

. (1 indent ) Pulse or frequency counter

913

. (1 indent ) Saturable reactor, space discharge device, or magnetic amplifier

914

.. (2 indent ) Thyratron or ignitron

915

. (1 indent ) Sawtooth or ramp waveform generator

916

. (1 indent ) Threshold circuit

917

. (1 indent ) Thyristor or SCR

918

.. (2 indent ) Trigger by unijunction transistor

919

.. (2 indent ) Triggered by resistor or capacitor

920

.. (2 indent ) Chopper

921

. (1 indent ) Timer or time delay means

922

. (1 indent ) Tuned or resonant circuit

923

SPECIFIC FEEDBACK CONDITION OR DEVICE

924

. (1 indent ) Centrifugal device (e.g., governor)

925

.. (2 indent ) Including contacts which open and close motor circuit

926

.. (2 indent ) Which controls a vacuum tube or solid-state device in motor circuit

927

.. (2 indent ) Which varies resistance of motor circuit

928

.. (2 indent ) Which controls position of commutator brushes

928.1

. (1 indent ) Counter or back EMF (CEMF)

929

. (1 indent ) Fluid/granular material flow rate, pressure, or level

930

. (1 indent ) Load or torque

931

.. (2 indent ) Electric generator or magnet as auxiliary load

932

.. (2 indent ) With reverse torque (e.g., braking)

933

. (1 indent ) Radiant energy responsive device

934

. (1 indent ) Thermal condition

935

SPECIFIC APPLICATION:

936

. (1 indent ) Food preparation equipment

937

. (1 indent ) Hand tool

	FOREIGN ART COLLECTIONS

FOR000

CLASS-RELATED FOREIGN DOCUMENTS

   Note: Some content linked to on this page may require a plug-in for Adobe Acrobat Reader.

This file produced by USPTO - SIRA - Office of Patent Automation - ReferenceTools Project. Questions or comments relating to this file should be directed to Patent Automation Feedback.