US Patent Class 388
ELECTRICITY: MOTOR CONTROL SYSTEMS



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Current as of: June, 1999
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  DF  CLASS NOTES
800  DF  CLOSED LOOP SPEED CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR
801  DF  .~ Field control, or field and armature control, by digital or combined analog and digital circuitry
803  DF  .~ Field control, or field and armature control, by analog (only) circuitry
804  DF  .~.~ By pulse width or duty cycle modification
805  DF  .~.~ By phase or frequency modification
806  DF  .~.~ By voltage or current modification
807  DF  .~.~.~ With variable impedance
808  DF  .~.~ By selection of windings
809  DF  .~ Armature control by digital or combined analog and digital circuitry
811  DF  .~.~ By pulse width or duty cycle modification
812  DF  .~.~ By phase and frequency modification
813  DF  .~.~ By phase modification
814  DF  .~.~ By frequency modification
815  DF  .~.~ By voltage or current modification
816  DF  .~ Analog armature control
819  DF  .~.~ By pulse width or duty cycle modification
820  DF  .~.~ By phase or frequency modification
821  DF  .~.~ By voltage and current modification
822  DF  .~.~ By voltage modification
823  DF  .~.~ By current modification
824  DF  .~.~ By variable impedance (e.g., potentiometer)
825  DF  OPEN LOOP SPEED CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR
826  DF  .~ Field control, or field and armature control
827  DF  .~.~ With plural selectable speeds (e.g., manual switch)
828  DF  .~ Armature control by digital or combined analog and digital circuitry
829  DF  .~.~ By pulse width or duty cycle modification
830  DF  .~ Analog armature control
831  DF  .~.~ By pulse width or duty cycle modification
832  DF  .~.~ By frequency modification
833  DF  .~.~ By voltage or current modification
834  DF  .~.~ By selection of windings
835  DF  .~.~ By control of motor structure
836  DF  .~.~.~ Position or number of brushes
837  DF  .~.~ By periodic mechanical switch
838  DF  .~.~ With plural selectable speeds (e.g., with manual switch, potentiometer
839  DF  .~.~.~ By selecting impedance
840  DF  .~.~.~.~ Resistive
841  DF  .~.~.~.~ Inductive
842  DF  CLOSED LOOP ACCELERATION CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR
843  DF  .~ Field control, or field and armature control
844  DF  .~ Armature control
847  DF  .~.~ By voltage or current modification
848  DF  OPEN LOOP ACCELERATION CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR
849  DF  .~ Field control, or field and armature control
850  DF  .~.~ By transformer or inductive device
851  DF  .~.~ By patterned switch
852  DF  .~.~ By insertion of resistance
853  DF  .~ Armature control
854  DF  .~.~ By voltage or current modification
855  DF  .~.~ By selectable or variable impedance
856  DF  .~.~.~ By insertion of resistance or shorting of circuit
857  DF  .~.~.~.~ With relay
858  DF  .~.~.~.~.~ Time delay relay
859  DF  .~.~.~.~ With patterned switch
860  DF  .~.~.~ Manual
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CROSS-REFERENCE ART COLLECTIONS
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900  DF  SPECIFIC SYSTEM OPERATIONAL FEATURE
901  DF  .~ Sample and hold
902  DF  .~ Compensation
903  DF  .~ Protective (e.g., voltage or current limit)
904  DF  .~ Stored velocity profile
905  DF  .~ Armature and field windings connected in series (i.e., series motor)
906  DF  .~ Proportional-integral system
907  DF  SPECIFIC CONTROL CIRCUIT ELEMENT OR DEVICE
907.2  DF  .~ Bridge circuit
907.5  DF  .~ Computer or microprocessor
908  DF  .~ Frequency to voltage converter
909  DF  .~ Monitoring means
910  DF  .~ Operational/differential amplifier
911  DF  .~ Phase locked loop
912  DF  .~ Pulse or frequency counter
913  DF  .~ Saturable reactor, space discharge device, or magnetic amplifier
914  DF  .~.~ Thyratron or ignitron
915  DF  .~ Sawtooth or ramp waveform generator
916  DF  .~ Threshold circuit
917  DF  .~ Thyristor or SCR
918  DF  .~.~ Trigger by unijunction transistor
919  DF  .~.~ Triggered by resistor or capacitor
920  DF  .~.~ Chopper
921  DF  .~ Timer or time delay means
922  DF  .~ Tuned or resonant circuit
923  DF  SPECIFIC FEEDBACK CONDITION OR DEVICE
924  DF  .~ Centrifugal device (e.g., governor)
925  DF  .~.~ Including contacts which open and close motor circuit
926  DF  .~.~ Which controls a vacuum tube or solid-state device in motor circuit
927  DF  .~.~ Which varies resistance of motor circuit
928  DF  .~.~ Which controls position of commutator brushes
928.1  DF  .~ Counter or back EMF (CEMF)
929  DF  .~ Fluid/granular material flow rate, pressure, or level
930  DF  .~ Load or torque
931  DF  .~.~ Electric generator or magnet as auxiliary load
932  DF  .~.~ With reverse torque (e.g., braking)
933  DF  .~ Radiant energy responsive device
934  DF  .~ Thermal condition
935  DF  SPECIFIC APPLICATION:
936  DF  .~ Food preparation equipment
937  DF  .~ Hand tool