H02K - Definition 
Definition statement
This subclass covers:
Electric generators or motors, i.e. ac or dc continuously rotating, oscillating or linear machines.
Stepping motors, i.e. with rotor rotating step by step.
Torque motors, i.e. machines adapted to exert a torque when stalled.
Machines for transmitting angular displacements, e.g. Synchro, Selsyn.
Machines involving dynamo-electric interaction with a plasma or a flow of conductive liquid or of fluid-borne conductive or magnetic particles, e.g. magnetohydrodynamic (MHD) pumps or generators.
Dynamo-electric converters, e.g. ac/dc converters and vice versa, ac/ac converters, dc/dc converters.
Dynamo-electric clutches or brakes.
Dynamo-electric gears, i.e. dynamo-electric means for transmitting mechanical power from a driving shaft to a driven shaft and comprising structurally interrelated motor and generator parts.
Alleged perpetua mobilia obtained by dynamo-electric means.
Machines not otherwise provided for and based on dynamo-electric interaction.
Structural adaptation of the above mentioned machines for the purposes of their control.
Relationship between large subject matter areas
The subject matter of starting, regulating, electronically commutating, braking, or otherwise controlling the machines covered by this subclass is classified in subclass H02P.
Measuring the electric or magnetic variables involved in the functioning of the machines covered by this subclass is classified in subclass G01R.
Electrical machines specifically developed for generating or transmitting mechanical vibrations are classified in subclass B06B.
Electric machines not belonging to any of the types covered by this subclass are classified in subclass H02N.
References relevant to classification in this subclass
This subclass does not cover:
Dynamo-electric relays | H01H 53/00 |
Conversion of dc or ac input power into surge output power | H02M 9/00 |
Current collectors in general | H01R 39/00 |
Informative references
Attention is drawn to the following places, which may be of interest for search:
Microstructural devices or systems | B81B |
Magnetic circuits or magnets in general | H01F |
Special rules of classification
H02K 16/00 takes precedence over groups H02K 17/00-H02K 53/00.
Details only described with reference to, or clearly only applicable to, dynamo-electric machines of a single basic type, are classified in the group appropriate to the dynamo-electric machines of that basic type, e.g. H02K 33/16, H02K 41/03.
Details or arrangements of an unspecified type of dynamo-electric machine, or disclosed as applicable to two or more kinds of dynamo-electric machines, are classified in groups H02K 1/00-H02K 13/00.
Glossary of terms
In this subclass, the following terms or expressions are used with the meaning indicated:
| Dynamo-electric | refers to the conversion of mechanical energy to electrical energy or vice versa by electromagnetic means. |