H02K DYNAMO-ELECTRIC MACHINES
Introduced: September 1968
Classification Context
- Section:
- ELECTRICITY
- Class:
- GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
- Subclass:
- DYNAMO-ELECTRIC MACHINES
Description
H02K covers rotating electrical machines that convert mechanical energy to electrical energy (generators) or electrical energy to mechanical energy (motors). This subclass encompasses DC machines, AC induction motors, synchronous machines, and specialized motor types including stepper motors and permanent magnet machines. The classification includes design aspects such as windings, cooling systems, magnetic circuits, and structural components of dynamo-electric machines. Adjacent classes H02P (electric machine control) and H02M (power conversion) address operational control and power supply aspects respectively, rather than the machine construction covered here.
Filing statistics
IPC subclass H02K recorded 426,168 patent applications worldwide between 2013 and 2023. Annual filings grew from 23,896 in 2013 to 46,626 in 2023 (+95%), peaking at 54,100 applications in 2020. The most active applicants in class H02 are SGCC(STATE GRID CORPORATION OF CHINA) (54,496 applications), MITSUBISHI ELECTRIC CORPORATION (10,495 applications) and TOYOTA MOTOR CORPORATION (9,464 applications).
Source: EPO PATSTAT, worldwide filings
In class comparison
H02K ranks 2nd of 9 subclasses with filings in H02, with 426,168 applications between 2013 and 2023, 18.6% of the class. Annual filings grew 95% from 2013 to 2023, below the class as a whole (+132%).
| Rank | Subclass | Title | Applications | Share |
|---|---|---|---|---|
| 1 | H02J, Electric Power Networks; Circuit Arrangements or Systems for Supplying or Distributing Electric Power; Systems for Storing Electric Energy | Electric Power Networks; Circuit Arrangements or Systems for Supplying or Distributing Electric Power; Systems for Storing Electric Energy | 623,631 | 27.2% |
| 2 | H02K | Dynamo-Electric Machines | 426,168 | 18.6% |
| 3 | H02G, Installation of Electric Cables or Lines, or of Combined Optical and Electric Cables or Lines | Installation of Electric Cables or Lines, or of Combined Optical and Electric Cables or Lines | 280,513 | 12.3% |
| 4 | H02M, Apparatus for Conversion Between Ac and Ac, Between Ac and Dc, or Between Dc and Dc, and for Use With Mains or Similar Power Supply Systems; Conversion of Dc or Ac Input Power Into Surge Output Power; Control or Regulation Thereof | Apparatus for Conversion Between Ac and Ac, Between Ac and Dc, or Between Dc and Dc, and for Use With Mains or Similar Power Supply Systems; Conversion of Dc or Ac Input Power Into Surge Output Power; Control or Regulation Thereof | 261,349 | 11.4% |
| 5 | H02B, Boards, Substations or Switching Arrangements for the Supply or Distribution of Electric Power | Boards, Substations or Switching Arrangements for the Supply or Distribution of Electric Power | 228,580 | 10.0% |
| 6 | H02S, Generation of Electric Power by Conversion of Infrared Radiation, Visible Light or Ultraviolet Light, e.g. Using Photovoltaic [PV] Modules | Generation of Electric Power by Conversion of Infrared Radiation, Visible Light or Ultraviolet Light, e.g. Using Photovoltaic [PV] Modules | 178,704 | 7.8% |
| 7 | H02H, Emergency Protective Circuit Arrangements | Emergency Protective Circuit Arrangements | 123,243 | 5.4% |
| 8 | H02P, Control or Regulation of Electric Motors, Electric Generators or Dynamo-Electric Converters; Controlling Transformers, Reactors or Choke Coils | Control or Regulation of Electric Motors, Electric Generators or Dynamo-Electric Converters; Controlling Transformers, Reactors or Choke Coils | 122,940 | 5.4% |
| 9 | H02N, Electric Machines Not Otherwise Provided for | Electric Machines Not Otherwise Provided for | 44,586 | 1.9% |
Source: EPO PATSTAT, worldwide filings
Additional Content
Glossary
Dynamo-electric refers to the conversion of mechanical energy to electrical energy or vice versa by electromagnetic means.
Limiting references
Dynamo-electric relays Conversion of DC or AC input power into surge output power Current collectors in general
Related Keywords
31 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- H02K 1/00 Details of the magnetic circuit
- H02K 11/00 Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K 13/00 Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings; Disposition of current collectors in motors or generators; Arrangements for improving commutation
- H02K 15/00 Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K 16/00 Machines with more than one rotor or stator
- H02K 17/00 Asynchronous induction motors; Asynchronous induction generators
- H02K 19/00 Synchronous motors or generators
- H02K 21/00 Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K 23/00 DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
- H02K 24/00 Machines adapted for the instantaneous transmission or reception of the angular displacement of rotating parts, e.g. synchro, selsyn
- H02K 25/00 DC interrupter motors or generators
- H02K 26/00 Machines adapted to function as torque motors, i.e. to exert a torque when stalled
- H02K 27/00 AC commutator motors or generators having mechanical commutator
- H02K 29/00 Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K 3/00 Details of windings
- H02K 31/00 Acyclic motors or generators, i.e. DC machines having drum or disc armatures with continuous current collectors
- H02K 33/00 Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
- H02K 35/00 Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit
- H02K 37/00 Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
- H02K 39/00 Generators specially adapted for producing a desired non-sinusoidal waveform
Top Applicants
Top 10 applicants by patent filingsfor class H02, 2013–2023, worldwide · Source: EPO PATSTAT
- SGCC(STATE GRID CORPORATION OF CHINA) 54,496
- MITSUBISHI ELECTRIC CORPORATION JP 10,495
- TOYOTA MOTOR CORPORATION 9,464
- GUANGDONG POWER GRID CORPORATION 9,339
- ROBERT BOSCH DE 8,226
- SIEMENS DE 8,218
- DENSO CORPORATION 7,063
- MITSUBISHI ELECTRIC CORPORATION 6,619
- SAMSUNG ELECTRONICS COMPANY KR 5,826
- GREE ELECTRIC APPLIANCES 5,094