US PATENT SUBCLASS 318 / 34
PLURAL, DIVERSE OR DIVERSELY CONTROLLED ELECTRIC MOTORS

Current as of: June, 1999
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318 /   HD   ELECTRICITY: MOTIVE POWER SYSTEMS

34PLURAL, DIVERSE OR DIVERSELY CONTROLLED ELECTRIC MOTORS {22}
35  DF  .~> Motors with diverse motions (e.g., reciprocating and rotary motors)
37  DF  .~> Plural reciprocating or oscillating motors
38  DF  .~> Plural linear-movement motors
39  DF  .~> Work and feed motors (e.g., indexing)
40  DF  .~> Motor biased against rotation
41  DF  .~> Having electrical synchronizing interconnections {3}
45  DF  .~> Mechanically coupled in fixed ratio of movement {2}
49  DF  .~> Motors electrically connected in cascade or tandem {1}
51  DF  .~> Plural, diverse motor controls for different motors
52  DF  .~> Slipping and/or racing control for electric motors
53  DF  .~> Plural, diverse motor controls {4}
65  DF  .~> Motor-reversing
66  DF  .~> Running-speed control {4}
85  DF  .~> Synchronizing or phasing control
86  DF  .~> Braking {1}
90  DF  .~> Acceleration control {4}
98  DF  .~> Load control {1}
101  DF  .~> Starting and/or stopping {3}
105  DF  .~> Plural, diverse or diversely controlled sources of armature (or primary) supply {1}
111  DF  .~> Series-parallel connected motors
112  DF  .~> Parallel connected motors
113  DF  .~> Series connected motors

DEFINITION

Classification: 318/34

(under the class definition) Subject matter in which there are two or more electric motors forming the ultimate load on the system of which one or more thereof are: (1) Substantially structurally different than, or (2) Supplied by substantially different sources of electrical supply than, or (3) Controlled substantially differently than one or more others of the motors.

(1) Note. For example only, it is interpreted that: (1) Motors differ structurally when they are different in size, capacity, structural details, etc.; (2) Motors are supplied

by different sources of supply when the sources differ (a) in kind or type (e.g., AC and DC, generators and electrical converters, different types of electrical converters, different types of generators, etc.) or (b) when the sources differ in size or capacity, or in magnitude of an electrical characteristic thereof, such for example as frequency, voltage; (3) Motors are controlled differently when they are controlled at different times, in different degrees or magnitude, by different control means, by control means in different motor circuits, etc.

(2) Note. When the system of supply and control is not limited as above, that is, when the motors are controlled as a unit, classification will be in the subclasses with single motors.

(3) Note. The several motors must have a useful output severally and individually (i.e., they must be "work" motors). When a motor merely actuates a control element for controlling another motor, such motor is not a useful output or work motor such as is classified herein.

(4) Note. Plural motors implies the existence of two distinct motors. Two distinct motors may be encased in a common housing, be intricately interfitting, or mounted on a common base. However, each must have its distinct field structure and its distinct primary or armature structure, and each must be magnetically distinct, from the other. A motor element having a common field structure, a common field flux or a common path for the field flux, even though excited by separate windings fed from each armature and two separate armature structures, is not considered a plural motor device. Likewise, a common armature with separate windings supplied by different sources, but in which the fluxes traverse common parts or paths is not a plural motor device.

(5) Note. Motor systems having a plurality of motors, one or more of which run at a constant speed or are not provided with any significant motor control means, and only one of the motors being provided with significant control means, are not classified in subclasses 34+, but will be found in the subclasses below which provide for the control system for the single motor which is controlled. SEE OR SEARCH THIS CLASS, SUBCLASS:

5, for this subject matter where two or more motors drive plural particular load devices.

7, for this subject matter where the plural motors control the tension or tautness of a material being driven or moved by the motors.

8, for this subject matter where two or more motors drive a particular load device.

19, for this subject matter where the system has two or more

follow-up motors.

SEE OR SEARCH CLASS

60, Power Plants,

698+, for plural motors in general, including the combination of an electrical motor and a nonelectrical motor. See the search notes in the definition of subclass 698 of Class 60 for a listing of plural motor subclasses.

91, Motors: Expansible Chamber Type,

165+, and 508+ for plural expansible chamber motors.

290, Prime-Mover Dynamo Plants, 4, for electric generation systems having two or more prime movers, at least one of which is a nonelectric prime mover, for actuating a generator or generators.

310, Electrical Generator or Motor Structure,

112+, for plural rotary dynamo-electric units electrically distinct but structurally united; subclasses 114+ for rotary electric motors or generators having plural rotors; subclasses 127+ for electric motors having two or more commutator and/or sets of slip rings.