| Class 388 | ELECTRICITY: MOTOR CONTROL SYSTEMS |
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| 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. | ||
![[List of Pre Grant Publications for class 388 subclass 800]](../as.gif) | ![[List of Patents for class 388 subclass 800]](../ps.gif) | 800 | CLOSED LOOP SPEED CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR |
| | 801 |  Field control, or field and armature control, by digital or combined analog and digital circuitry |
| | 803 | Field control, or field and armature control, by analog (only) circuitry |
| | 804 |  By pulse width or duty cycle modification |
| | 805 | By phase or frequency modification |
| | 806 | By voltage or current modification |
| | 808 | By selection of windings |
| | 809 | Armature control by digital or combined analog and digital circuitry |
| | 811 | By pulse width or duty cycle modification |
| | 812 | By phase and frequency modification |
| | 813 | By phase modification |
| | 814 | By frequency modification |
| | 815 | By voltage or current modification |
| | 816 | Analog armature control |
| | 825 | OPEN LOOP SPEED CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR |
| | 826 | Field control, or field and armature control |
| | 828 | Armature control by digital or combined analog and digital circuitry |
| | 830 | Analog armature control |
| | 842 | CLOSED LOOP ACCELERATION CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR |
| | 848 | OPEN LOOP ACCELERATION CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR |
| CROSS-REFERENCE ART COLLECTIONS | ||
| | 900 | SPECIFIC SYSTEM OPERATIONAL FEATURE |
| | 901 | Sample and hold |
| | 902 | Compensation |
| | 903 | Protective (e.g., voltage or current limit) |
| | 904 | Stored velocity profile |
| | 905 | Armature and field windings connected in series (i.e., series motor) |
| | 906 | Proportional-integral system |
| | 907 | SPECIFIC CONTROL CIRCUIT ELEMENT OR DEVICE |
| | 907.2 | Bridge circuit |
| | 907.5 | Computer or microprocessor |
| | 908 | Frequency to voltage converter |
| | 909 | Monitoring means |
| | 910 | Operational/differential amplifier |
| | 911 | Phase locked loop |
| | 912 | Pulse or frequency counter |
| | 913 | Saturable reactor, space discharge device, or magnetic amplifier |
| | 915 | Sawtooth or ramp waveform generator |
| | 916 | Threshold circuit |
| | 917 | Thyristor or SCR |
| | 921 | Timer or time delay means |
| | 922 | Tuned or resonant circuit |
| | 923 | SPECIFIC FEEDBACK CONDITION OR DEVICE |
| | 924 | Centrifugal device (e.g., governor) |
| | 925 | Including contacts which open and close motor circuit |
| | 926 | Which controls a vacuum tube or solid-state device in motor circuit |
| | 927 | Which varies resistance of motor circuit |
| | 928 | Which controls position of commutator brushes |
| | 928.1 | Counter or back EMF (CEMF) |
| | 929 | Fluid/granular material flow rate, pressure, or level |
| | 930 | Load or torque |
| | 933 | Radiant energy responsive device |
| | 934 | Thermal condition |
| | 935 | SPECIFIC APPLICATION: |
| FOREIGN ART COLLECTIONS | ||
| FOR000 | CLASS-RELATED FOREIGN DOCUMENTS |