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Class Information
Number: 388
Name: Electricity: motor control systems >
Description: STATEMENT OF CLASS SUBJECT MATTER










Class Number Class Name No. of Patents
388/842

Closed loop acceleration control system for dc motor with commutator

9
388/844

Armature control

6
388/847

By voltage or current modification

22
388/843

Field control, or field and armature control

11
388/800

Closed loop speed control system for dc motor with commutator

159
388/816

Analog armature control

62
388/823

By current modification

61
388/820

By phase or frequency modification

82
388/819

By pulse width or duty cycle modification

113
388/824

By variable impedance (e.g., potentiometer)

24
388/821

By voltage and current modification

60
388/822

By voltage modification

64
388/809

Armature control by digital or combined analog and digital circuitry

114
388/814

By frequency modification

136
388/812

By phase and frequency modification

106
388/813

By phase modification

99
388/811

By pulse width or duty cycle modification

429
388/815

By voltage or current modification

236
388/803

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

49
388/805

By phase or frequency modification

47
388/804

By pulse width or duty cycle modification

132
388/808

By selection of windings

6
388/806

By voltage or current modification

123
388/807

With variable impedance

11
388/801

Field control, or field and armature control, by digital or combined analog and digital circuitry

69
388/848

Open loop acceleration control system for dc motor with commutator

3
388/853

Armature control

2
388/855

By selectable or variable impedance

2
388/856

By insertion of resistance or shorting of circuit

2
388/859

With patterned switch

3
388/857

With relay

2
388/858

Time delay relay

1
388/860

Manual

6
388/854

By voltage or current modification

7
388/849

Field control, or field and armature control

4
388/852

By insertion of resistance

0
388/851

By patterned switch

3
388/850

By transformer or inductive device

1
388/825

Open loop speed control system for dc motor with commutator

33
388/830

Analog armature control

27
388/835

By control of motor structure

10
388/836

Position or number of brushes

22
388/832

By frequency modification

21
388/837

By periodic mechanical switch

5
388/831

By pulse width or duty cycle modification

72
388/834

By selection of windings

4
388/833

By voltage or current modification

37
388/838

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

54
388/839

By selecting impedance

10
388/841

Inductive

1
388/840

Resistive

33
388/828

Armature control by digital or combined analog and digital circuitry

23
388/829

By pulse width or duty cycle modification

56
388/826

Field control, or field and armature control

13
388/827

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

20
388/935

Specific application:

4
388/936

Food preparation equipment

14
388/937

Hand tool

127
388/907

Specific control circuit element or device

37
388/907.2

Bridge circuit

63
388/907.5

Computer or microprocessor

265
388/908

Frequency to voltage converter

31
388/909

Monitoring means

87
388/910

Operational/differential amplifier

134
388/911

Phase locked loop

95
388/912

Pulse or frequency counter

202
388/913

Saturable reactor, space discharge device, or magnetic amplifier

1
388/914

Thyratron or ignitron

0
388/915

Sawtooth or ramp waveform generator

143
388/916

Threshold circuit

43
388/917

Thyristor or scr

163
388/920

Chopper

50
388/918

Trigger by unijunction transistor

9
388/919

Triggered by resistor or capacitor

31
388/921

Timer or time delay means

116
388/922

Tuned or resonant circuit

26
388/923

Specific feedback condition or device

21
388/924

Centrifugal device (e.g., governor)

5
388/925

Including contacts which open and close motor circuit

5
388/926

Which controls a vacuum tube or solid-state device in motor circuit

1
388/928

Which controls position of commutator brushes

5
388/927

Which varies resistance of motor circuit

0
388/928.1

Counter or back emf (cemf)

128
388/929

Fluid/granular material flow rate, pressure, or level

31
388/930

Load or torque

120
388/931

Electric generator or magnet as auxiliary load

4
388/932

With reverse torque (e.g., braking)

9
388/933

Radiant energy responsive device

67
388/934

Thermal condition

179
388/900

Specific system operational feature

39
388/905

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

6
388/902

Compensation

172
388/906

Proportional-integral system

61
388/903

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

230
388/901

Sample and hold

77
388/904

Stored velocity profile

67
 
 
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