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| Class 318 | ELECTRICITY: MOTIVE POWER SYSTEMS |
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![[List of Pre Grant Publications for class 318 subclass 1]](../as.gif) | ![[List of Patents for class 318 subclass 1]](../ps.gif) | 1 | ELECTRIC MOTOR WITH NONMOTOR DRIVING MEANS (E.G., AXLE DRIVE, MANUAL DRIVE) |
| | 3 | WITH PARTICULAR MOTOR-DRIVEN LOAD DEVICE |
| | 4 |  Plural, diverse or diversely controlled load device |
| | 6 | Tension-maintaining type of motor-control system |
| | 8 | Plural, diverse or diversely controlled driving motors (e.g., driving differential gearing) |
| | 9 | Power- or motion-transmitting mechanism |
| | 16 | SUPPLIED OR CONTROLLED BY SPACE-TRANSMITTED ELECTROMAGNETIC OR ELECTROSTATIC ENERGY (E.G., BY RADIO) |
| | 17 | PORTABLE-MOUNTED MOTOR AND/OR PORTABLE-MOUNTED ELECTRICAL SYSTEMS THEREFOR |
| | 560 | POSITIONAL SERVO SYSTEMS (E.G., SERVOMECHANISMS) |
| | 561 | Adaptive or optimizing systems including "bang-bang" servos |
| | 562 | Time-sharing or multiplexing systems |
| | 563 | With protective or reliability increasing features (e.g., "fail-safe" systems) |
| | 567 | Program- or pattern-controlled systems |
| | 568.1 |  With program recording or composing means |
| | 568.11 |  Multifunction manipulator (i.e., Robot) |
| | 568.12 |  Mobile robot |
| | 568.13 | With particular program teaching method |
| | 568.15 | With particular interpolation means |
| | 568.16 | With particular sensing device |
| | 568.17 | With multimode control (e.g., course-fine, position-force, etc.) |
| | 568.19 | With particular coordinate transformation means |
| | 568.2 | With plural control systems (e.g., the interaction of plural processors to control the plural joints of a single robot): |
| | 568.22 | With particular compensation (e.g., gain, offset, etc.) |
| | 568.24 | With reliability enhancement means (e.g., monitoring, redundant circuits, etc.) |
| | 569 | Digital or numerical systems |
| | 575 | Multiple axes analog systems |
| | 580 | Vehicular guidance systems with single axis control |
| | 581 | Radio-controlled |
| | 582 | Celestial navigation |
| | 583 | Landing systems |
| | 584 | Altitude or pitch control |
| | 585 | Roll control |
| | 586 | Yaw control |
| | 587 | Land vehicles |
| | 588 | Marine vehicles |
| | 590 | Multiple mode systems |
| | 591 | With mode-engagement features (e.g., manual to automatic) |
| | 592 | Fine and coarse systems |
| | 596 | Combined "on-off" and proportional control |
| | 597 | Slewing systems |
| | 599 | Pulse-width modulated power input to motor (e.g., "duty cycle" systems) |
| | 600 | Digital or numerical systems |
| | 606 | Frequency- or phase-modulated systems |
| | 609 | "Reset" systems (P.I.) |
| | 611 | With stabilizing features (e.g., anti-hunting, damping) |
| | 612 | Electric braking near balance (e.g., dynamic) |
| | 614 | Friction-braking near balance including magnetic or eddy current brakes |
| | 615 | By auxiliary feedback loop |
| | 619 | Variable gain bandwidth |
| | 620 | Nonlinear circuits |
| | 621 | Lead or lag networks |
| | 623 | Load stabilization (e.g., viscous, magnetic or friction dampers) |
| | 624 | By deadband at null (e.g., threshold circuits) |
| | 625 | Plural servomotors |
| | 626 | Limit or end-stop control |
| | 628 | "Feelback" systems |
| | 629 | Unwanted harmonic or voltage component elimination quadrature rejection systems |
| | 630 | Antibacklash systems (e.g., with unidirectional approach to balance) |
| | 631 | Antistatic friction features (e.g., "dither" voltage) |
| | 632 | With compensating features |
| | 635 | With signal-, voltage-, or current-limiting |
| | 636 | "Sampling" systems including miscellaneous "sampled data" control systems |
| | 637 | Analog computation |
| | 638 | With particular "error-detecting" means |
| | 639 | Plural, diverse conditions |
| | 640 | Photoelectric or optical-type measuring instruments |
| | 641 | With particular temperature measuring instrument |
| | 642 | With liquid level measuring instruments |
| | 643 | With moisture content or wetness measuring instruments |
| | 644 | With flow measuring instruments |
| | 645 | With fluid pressure measuring instruments |
| | 646 | With force or weight measuring instruments |
| | 647 | With magnetic field measuring instruments |
| | 648 | With inertial, direction or inclination measuring instrument |
| | 650 | With current, voltage or electrical power measuring instruments |
| | 651 | With acceleration measuring instruments |
| | 652 | With particular position measuring instruments |
| | 653 | Magnetic transducers |
| | 654 | Synchro control transmitter-transformer systems |
| | 656 | Differential transformer systems |
| | 657 | Linear differential transformer |
| | 658 | "E" type transformer |
| | 659 | "Microsyn" type |
| | 660 | "Inductosyn" systems |
| | 661 | Resolver systems |
| | 662 | Variable capacitor systems |
| | 663 | Potentiometer systems including autotransformers and Wheatstone bridges |
| | 664 | Minor arc seeking |
| | 665 | Continuous rotation, unlimited range |
| | 666 | Controlled tap and slidewire |
| | 667 | With a bridge in the feedback circuit |
| | 669 | Standing wave |
| | 670 | Contact resistance |
| | 671 | With particular motor control system responsive to the "actuating signal" |
| | 672 | Discontinuous or "on-off" control |
| | 675 | One transmitter or controller element follows another |
| | 676 | Transmitter or controller element returned (e.g., force balance systems) |
| | 677 | With particular servoamplifier |
| | 678 | Differential amplifier |
| | 679 | Diverse types of amplifiers in different stage |
| | 680 | Magnetic servoamplifiers |
| | 681 | Solid-state servoamplifiers |
| | 682 | Rotating amplifier (e.g., "Ward Leonard" control) |
| | 683 | With particular phase discriminator |
| | 684 | With particular modulator or detector (e.g., choppers) |
| | 685 | "Step-by-step" motors in closed-loop servos |
| | 686 | Reciprocating or oscillating motors |
| | 687 | Linear movement motors |
| | 688 | Shaded pole motors |
| | 689 | TORQUING MOTORS |
| | 690 | SELF-SYNCHRONOUS TYPE OF MOTOR |
| | 691 | With means to amplify transmitter signals |
| | 692 | Having induction or "selsyn" type transmitter |
| | 693 | Having impedance-type transmitter |
| | 694 | Having commutated dynamoelectric machine transmitter |
| | 695 | Having commutating switch-type transmitter |
| | 696 | OPEN-LOOP STEPPING MOTOR CONTROL SYSTEMS |
| | 34 | PLURAL, DIVERSE OR DIVERSELY CONTROLLED ELECTRIC MOTORS |
| | 35 | Motors with diverse motions (e.g., reciprocating and rotary motors) |
| | 37 | Plural reciprocating or oscillating motors |
| | 38 | Plural linear-movement motors |
| | 39 | Work and feed motors (e.g., indexing) |
| | 40 | Motor biased against rotation |
| | 41 | Having electrical synchronizing interconnections |
| | 42 | Between windings on auxiliary dynamo-electric machines |
| | 43 | D.C. or A.C. commutator motors with slip rings |
| | 44 | Between induction motor secondaries |
| | 45 | Mechanically coupled in fixed ratio of movement |
| | 49 | Motors electrically connected in cascade or tandem |
| | 51 | Plural, diverse motor controls for different motors |
| | 52 | Slipping and/or racing control for electric motors |
| | 53 | Plural, diverse motor controls |
| | 54 | Motor-reversing |
| | 59 | Running-speed control |
| | 60 | And braking |
| | 61 | And acceleration control |
| | 62 | And automatic starting and/or stopping and/or with time delay |
| | 63 | Braking |
| | 64 | Acceleration control |
| | 65 | Motor-reversing |
| | 66 | Running-speed control |
| | 67 | Diverse speeds for different motors |
| | 68 | Relative motor speed control |
| | 69 | With speed-difference detector |
| | 70 | Electrical-type detectors |
| | 71 |  Voltage and/or current difference detector |
| | 72 | Dynamoelectric machine detector |
| | 73 | Synchronously operated impedance detectors |
| | 74 | Synchronously actuated switch detectors |
| | 76 | Differential-gearing detector |
| | 77 | Controlling motor speed in response to speed of another motor |
| | 79 | Control of both armature (or primary) and field (or secondary) circuits |
| | 80 | Armature or primary circuit control |
| | 81 | Field secondary circuit control |
| | 82 | Armature or primary circuit control |
| | 84 | Field or secondary circuit control |
| | 85 | Synchronizing or phasing control |
| | 86 | Braking |
| | 90 | Acceleration control |
| | 91 | Accelerating motors in succession or selectively |
| | 92 | Control of both armature (or primary) and field (or secondary) circuits |
| | 94 | Armature or primary circuit control |
| | 97 | Field or secondary circuit control |
| | 98 | Load control |
| | 101 | Starting and/or stopping |
| | 102 | Sequential or successive starting and/or stopping |
| | 103 | Selective starting and/or stopping |
| | 104 | Armature (or primary) circuit control |
| | 105 | Plural, diverse or diversely controlled sources of armature (or primary) supply |
| | 111 | Series-parallel connected motors |
| | 112 | Parallel connected motors |
| | 113 | Series connected motors |
| | 114 | IMPACT, MECHANICAL SHOCK, OR VIBRATION-PRODUCING MOTORS |
| | 115 | MOTOR WITH DIVERSE MOTIONS (E.G., ROTARY AND RECIPROCATING) |
| | 116 | NONMAGNETIC MOTOR |
| | 118 | MAGNETOSTRICTIVE MOTOR |
| | 119 | RECIPROCATING OR OSCILLATING MOTOR |
| | 120 | Stopping after predetermined number of reciprocations or cycles (including single cycle) |
| | 121 | Having means to produce a progressing or traveling motor field flux |
| | 122 | Plural, diverse or diversely controlled motor windings |
| | 123 | Polyphase or diverse or diversely controlled sources of motor supply |
| | 125 | Unidirectionally conductive devices in energizing circuit |
| | 126 | Energizing winding circuit control |
| | 127 | Automatic in response to predetermined position, movement or condition in or of the motor or driven device |
| | 129 | By means for producing periodic electrical pulses in the energizing circuit |
| | 130 | Electrical oscillation or condenser charging and/or discharging circuits |
| | 131 | Motor or escapement-controlled means |
| | 132 | By space-discharge or unidirectionally conductive devices in energizing circuit |
| | 133 | By impedance devices in energizing circuit |
| | 134 | By circuit making and/or braking devices |
| | 135 | LINEAR-MOVEMENT MOTORS |
| | 136 | AUXILIARY MEANS FOR PRODUCING MECHANICAL STARTING OR ACCELERATING TORQUE |
| | 139 | BATTERY-FED MOTOR SYSTEMS |
| | 140 | GENERATOR-FED MOTOR SYSTEMS HAVING GENERATOR CONTROL |
| | 141 | Automatic generator control and/or with time-delay means |
| | 142 | Responsive to diverse conditions or with time-delay means |
| | 144 | Armature or primary current of motor |
| | 145 | Terminal voltage or counter e.m.f. of motor |
| | 146 | Speed of motor or driven device |
| | 147 | Speed or frequency of generator or its drive means |
| | 148 | Alternating-current-motor system |
| | 149 | With plural, diverse or diversely controlled generators |
| | 150 | With flywheel on generator or on motor |
| | 151 | Control of both the generator and the circuit to the motor |
| | 153 | Control of both the generator and the motor |
| | 156 | Plural, diverse or diversely actuated, generator control means |
| | 157 | Generator speed control |
| | 158 | Generator field circuit control |
| | 159 | HAVING ROTOR ELEMENT BIASED AGAINST ROTATION |
| | 161 | WITH FLYWHEEL OR MASSIVE ROTARY MEMBER |
| | 162 | CONTROL BY PATTERNS OR OTHER PREDETERMINED SCHEDULE MEANS |
| | 700 | SYNCHRONOUS MOTOR SYSTEMS |
| | 400.01 | Brushless motor closed-loop control |
| | 400.02 | Vector control (e.g., dq-axis control, 3-2 phase conversion, etc.) |
| | 400.03 | Plural reference comparison (e.g., reference changes during startup, upper/lower reference, etc.) |
| | 400.04 | Specific processing of feedback signal or circuit therefore (i.e., A-D conversion, compression, or modification) |
| | 400.05 | With reference signal generation (e.g., from external system, mechanical oscillator, etc.) |
| | 400.06 | Comparator circuit or method |
| | 400.07 | Plural diverse feedback (e.g., torque and speed, load and speed, etc.) |
| | 400.08 | With nonmotor parameter or remote condition detected (e.g., temperature, light, airflow, position of diverse object, etc.) |
| | 400.09 | Plural mode control (e.g., open and closed loop, starting and braking, plural-phase and single-phase operation, open and closed loop, etc.) |
| | 400.1 | With timing or delay |
| | 400.11 | With separate starting mode or "ramp-up" mode (e.g., open-loop control for startup, startup initialization, etc.) |
| | 400.12 | With table lookup, stored map, or memory table (e.g., speed table, stored current profile, etc.) |
| | 400.13 | With timing, delay, or clock pulse counting circuit or generation |
| | 400.15 | With torque or load determination (e.g., by calculation, detection, or estimation, etc.) |
| | 400.16 | Control or position information digitally stored on disk (e.g., computer hard drive position detection, etc.) |
| | 400.17 | Modification or waveshaping of switching control signal (e.g., switching control input to inverter, etc.) |
| | 400.18 | With manual control (e.g., foot switch, surgical tool, etc.) |
| | 400.19 | Slew rate control (e.g., slew limiting, etc.) |
| | 400.2 | Phase voltage wave-shaping circuit or method (e.g., output from inverter, phase energizing signal, trapezoidal wave, etc.) |
| | 400.21 | Having protection means (e.g., switching circuit protection, stall protection, failure to start, "wrong" direction, etc.) |
| | 400.23 | Torque ripple stabilization or acoustic noise attenuation (e.g., cogging prevention, etc.) |
| | 400.24 | Electrical noise attenuation (e.g., EMI, EMR, RFI, etc.) |
| | 400.25 | Switching noise transient attenuation (e.g., switching error prevention, masking, blanking, etc.) |
| | 400.26 | Switching circuit structure or component (e.g., inverter, bridge circuit, etc.) |
| | 400.3 | Power supply voltage feature (e.g., power supply voltage, Vcc compensation, rectifier circuit, power regulator, auxiliary or secondary power supply, etc.) |
| | 400.31 | Utilization or dissipation of stored or collapsing field energy (e.g., freewheeling, discharging one winding through another, etc.) |
| | 400.32 | Sensorless feedback circuit |
| | 400.33 | Voltage injection detection (e.g., voltage injected at startup to determine position, etc.) |
| | 400.34 | Electromotive force sensor (e.g., back or counter EMF sensor, etc.) |
| | 400.36 | With center-tap feedback circuit |
| | 400.37 | With sensor structure (e.g., tachometer, reed switch, cam-controlled switching, etc.) |
| | 400.38 | Magnetic field sensor or responsive device (e.g., Hall element, magneto-resistance, etc.) |
| | 400.39 | Rotating sensor component separate from motor structure (e.g., resolver, magnetically sensed rotating disk, etc.) |
| | 400.4 | Optical sensor (e.g., encoder, photodetector, etc.) |
| | 400.41 | Having specific motor structure (e.g., bifilar windings, airgap dimension, auxiliary winding, phase winding with midtap, etc.) |
| | 400.42 | Brushless motor open-loop control |
| | 701 | Hysteresis or reluctance motor systems |
| | 702 | Antihunting or damping |
| | 703 | Braking |
| | 704 | Pole changing motor winding circuits |
| | 705 | Synchronization systems |
| | 706 | With armature power removal upon failure to synchronize or loss of synchronism |
| | 709 | Having different armature voltage prior to synchronism |
| | 710 | With d.c. field removal |
| | 712 | With field excitation application |
| | 716 | Field winding circuits |
| | 720 | Armature winding circuits |
| | 725 | REPULSION MOTOR SYSTEMS |
| | 727 | INDUCTION MOTOR SYSTEMS |
| | 728 | Repulsion start |
| | 729 | Power-factor control |
| | 730 | With plural separately movable rotors |
| | 731 | With voltage source connected to motor secondary |
| | 732 | Electronic device controls current in secondary circuit |
| | 733 | Commutator connected to secondary winding |
| | 734 | Slip rings connected to secondary winding |
| | 737 | Self-cascaded motor windings |
| | 738 | With commutated winding |
| | 739 | Reversing |
| | 740 | With diverse motor operation |
| | 745 | With controlled saturable reactor in primary circuit |
| | 747 | Two phase motor |
| | 749 | Operating from a single phase source |
| | 750 | Shaded pole motor |
| | 751 | Split phase motor with capacitor interchangeably connected in series with either primary winding |
| | 753 | With de-energizable start winding |
| | 756 | With controlled electronic switch for phase reversal |
| | 757 | Braking |
| | 758 | With diverse operation |
| | 759 | Dynamic braking |
| | 763 | Reversal of power to primary winding |
| | 765 | Eddy current braking circuits |
| | 766 | Primary and secondary circuits |
| | 767 | Primary circuit control |
| | 768 | Three phase motor operated from single phase source |
| | 770 | Dual voltage motors |
| | 771 | Delta-wye, plural wye, or plural delta connected primary windings |
| | 772 | Plural speed |
| | 778 | Starting control |
| | 779 | With speed control |
| | 780 | Three phase motor with variable transformer to initially adjust voltage to motor windings |
| | 781 | Operating from a single phase source |
| | 782 | With protective features |
| | 784 | Impedance for reducing current during starting operation |
| | 785 | Start winding removed during running operation |
| | 786 | By electronic switch |
| | 787 |  With transformer for sensing the run winding current |
| | 788 | With variable temperature coefficient resistor in switch control circuit |
| | 789 | By electromagnetic switch |
| | 791 | By thermal switch |
| | 793 | By centrifugal switch |
| | 794 | Capacitor run motor with different capacitance at starting |
| | 796 | Saturable winding in capacitor run motor circuit |
| | 797 | Phase splitting using stator winding mutual inductance or saturable winding |
| | 798 | Responsive to motor condition |
| | 799 | Responsive to speed or rotation phase angle |
| | 805 | Responsive to motor voltage |
| | 806 | Condition responsive |
| | 807 | Frequency control |
| | 808 | With voltage magnitude control |
| | 809 | With voltage phase angle control |
| | 810 | With voltage pulse time control |
| | 812 | Voltage control |
| | 818 | Secondary circuit control |
| | 819 | Open secondary member or portion thereof with means to open or close the circuit thereto |
| | 820 | Closed secondary member or member portion with means to change electrical characteristics thereof |
| | 821 | Impedance control of secondary circuit |
| | 830 | With relatively movable cooperating motor parts to control energized motor |
| | 244 | ALTERNATING CURRENT COMMUTATING MOTORS |
| | 246 | SERIES MOTORS |
| | 247 | Convertible for nonseries motor operation |
| | 248 | With plural, diverse or diversely connected or controlled sources of e.m.f. |
| | 249 | Control by motor circuit impedance |
| | 251 | Field circuit control |
| | 253 | HOMOPOLAR OR UNIFORM FIELD MOTORS |
| | 254.1 | SWITCHED RELUCTANCE MOTOR COMMUTATION CONTROL |
| | 255 | PLURAL DIVERSE MOTOR CONTROLS |
| | 256 | Motor-reversing |
| | 257 | With running-speed control |
| | 261 | With braking |
| | 263 | With acceleration control |
| | 264 | With automatic starting and/or stopping |
| | 268 | Running-speed control |
| | 273 | Motor braking |
| | 276 | Acceleration control |
| | 280 | MOTOR-REVERSING |
| | 281 | Periodic- or intermittent-reversing |
| | 283 | Automatic and/or with time-delay means |
| | 284 | With means to delay reversing until motor substantially stops |
| | 285 | Instant of, or passage or predetermined time or having time-delay means |
| | 286 | Movement or position of motor or driven device |
| | 287 | Armature or primary circuit control |
| | 288 | Plural, diverse or diversely controlled armature windings |
| | 291 | Armature or primary current reversal |
| | 296 | Field circuit control |
| Class 388 subclasses 800-841 are an integral part of this Class (Class 318), as shown by the position of this box, and follows the schedule hierarchy of this Class, retaining all pertinent definitions and Class lines of this class. | ||
| | 362 | BRAKING |
| | 363 | "Spotting" or adjustment of braking controller during coasting |
| | 364 | Automatic and/or with time-delay means |
| | 370 | Plural, diverse or diversely controlled braking means |
| | 372 | Friction braking |
| | 373 | "Plugging" or application of reverse power to motor |
| | 375 | Dynamic braking |
| | 382 | By auxiliary electric generator or by magnetic attraction or repulsion devices |
| | 383 | "ANTI-BRAKING" OR BRAKING-PREVENTION MEANS |
| Class 388 subclasses 842-860 are an integral part of this Class (Class 318), as shown by the position of this box, and follows the schedule hierarchy of this Class, retaining all pertinent definitions and Class lines of this class. | ||
| | 430 | MOTOR LOAD, ARMATURE CURRENT OR FORCE CONTROL DURING STARTING AND/OR STOPPING |
| | 432 | CONSTANT MOTOR CURRENT, LOAD AND/OR TORQUE CONTROL |
| | 434 | LIMITATION OF MOTOR LOAD, CURRENT, TORQUE OR FORCE (E.G., PREVENTING OVERLOAD) |
| | 436 | NONRUNNING, ENERGIZED MOTOR |
| | 437 | PHASING OR ANGULAR OR LINEAR POSITIONAL CONTROL OF MOVABLE ELEMENT OF THE MOTOR |
| | 438 | POWER FACTOR CONTROL OF ARMATURE OR LINE CIRCUIT |
| | 440 | HAVING PLURAL, DIVERSE OR DIVERSELY CONTROLLED SOURCES |
| | 443 | PERIODIC, REPETITIOUS OR SUCCESSIVE OPERATIONS CONTROL OF MOTOR, INCLUDING "JOG" AND "INCH" CONTROL |
| | 445 | AUTOMATIC AND/OR WITH TIME-DELAY MEANS (E.G., AUTOMATIC STARTING AND/OR STOPPING) |
| | 446 | With nonautomatic control means (e.g., manual) |
| | 447 | Nonresponsive or less responsive for limited periods |
| | 448 | Anti-hunting |
| | 449 | With respect to a fixed standard, master or reference device |
| | 452 | Plural, diverse conditions or with time-delay means |
| | 456 | Rate-of-change of a condition |
| | 459 | Terminal voltage or counter-electromotive force of controlled motor |
| | 460 | Sound, supersonic vibration or mechanical vibration |
| | 461 | Speed or rate-of-movement |
| | 466 | Movement, position, or limit-of-travel |
| | 467 | Plural sensing means for determining plural positions or plural limits-of travel |
| | 468 | Limit-of-travel control means |
| | 470 | Magnitude of movement or revolutions |
| | 471 | Responsive to thermal conditions |
| | 474 | Motor load, armature or primary or secondary circuit current |
| | 475 | Mechanical-type detector (e.g., by yielding spring devices) |
| | 476 | In excess of a predetermined magnitude |
| | 478 | Electrical conditions in circuit other than controlled motor circuit |
| | 480 | Radiant energy |
| | 481 | Pressure in a fluid or granular material |
| | 482 | Level of fluid or granular material |
| | 483 | Moisture content or wetness |
| | 484 | Time or with time-delay means |
| | 485 | Dash-pot or other mechanical delay means |
| | 486 | Pilot- or servo-motors |
| | 487 | Electromagnetic or inductive time-delay means |
| | 488 | Responsive to stress in body or material |
| | 489 | Responsive to direction, inclination or angular position of bodies |
| | 490 | WITH SIGNALS, METERS, RECORDERS OR TESTING DEVICES |
| | 491 | CONTROL OF BOTH MOTOR CIRCUIT AND MOTOR STRUCTURE |
| | 492 | MOTOR MAGNETIC ENERGY DISSIPATION |
| | 493 | CONTROL OF BOTH ARMATURE (OR PRIMARY) CIRCUIT AND FIELD (OR SECONDARY) CIRCUIT |
| | 494 | ARMATURE (OR PRIMARY) CIRCUIT CONTROL |
| | 495 | Plural, diverse or diversely controlled, armature or primary windings |
| | 496 | Polyphase windings |
| | 497 | Series-parallel |
| | 498 | Energized or controlled in predetermined sequence |
| | 499 | Wound or energized in magnetic opposition |
| | 500 | Plural sources of voltage (including counter e.m.f. cells) |
| | 501 | By shunting armature or primary winding |
| | 502 | Variable length or tapped armature winding |
| | 503 | Frequency or pulsation control |
| | 504 | Voltage control |
| | 505 | By means to space-discharge devices |
| | 506 | Plural, diverse or diversely connected or controlled space-discharge devices |
| | 507 | Having discharge-control means (e.g., grids) |
| | 508 | Impedance-controlled |
| | 509 | Plural, diverse or diversely controlled impedances |
| | 511 | Inherently or self-variable impedance |
| | 512 | Inductive reactor controlled |
| | 514 | Resistor-controlled |
| | 519 | By armature or primary circuit-making and/or breaking |
| | 521 | FIELD OR SECONDARY CIRCUIT CONTROL |
| | 523 | Plural, diverse or diversely connected or controlled field windings |
| | 524 | Convertible number-of-poles type (e.g., 4-pole or 6-pole) |
| | 525 | Differentially wound or energized windings |
| | 526 | Series-parallel |
| | 527 | Series field winding |
| | 528 | With means to short circuit a field winding |
| | 529 | Selectively energized |
| | 530 | Plural, diverse or diversely connected or controlled sources of field circuit voltage |
| | 531 | Variable length or tapped field winding |
| | 532 | By means of space-discharge device in field circuit |
| | 533 | Impedance-controlled |
| | 536 | By field circuit making and/or breaking |
| | 538 | MOTOR STRUCTURE ADJUSTMENT OR CONTROL |
| | 539 | Both armature and field structures rotatable or adjustable |
| | 540 | Rotor element movable axially |
| | 541 | Brush or other current-collector control |
| | 543 | THREE-OR-MORE-POSITIONS MOTOR CONTROLLER SYSTEMS |
| | 544 | With other motor control device |
| | 546 | Plural, diverse or diversely controlled controllers |
| | 548 | Plural control stations |
| | 549 | Return to "off", "starting" or "neutral" positions |
| | 551 | Knee- or foot-operated controllers |
| | 552 | Power-actuated controllers |
| | 558 | MISCELLANEOUS |
| FOREIGN ART COLLECTIONS | ||
| FOR000 | CLASS-RELATED FOREIGN DOCUMENTS |
| Any foreign patents or nonpatent literature from subclasses that have been reclassified have been transferred directly to the FOR Collections listed below. These Collections contain ONLY foreign patents or nonpatent literature. The parenthetical references in the Collection titles refer to the abolished subclasses from which these Collections were derived. | ||
| FOR100 | SPACE-DISCHARGE-DEVICE COMMUTATED MOTOR (318/138) |
| FOR101 | SELF-COMMUTATED IMPULSE OR RELUCTANCE MOTORS (318/254) |
| FOR102 | MOTOR COMMUTATION CONTROL SYSTEMS (318/439) |
| DIGESTS | ||
| | DIG2 | WINDSHIELD WIPER CONTROLS |
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