IPC Main Group
H02K 27/00 AC commutator motors or generators having mechanical commutator
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- ELECTRICITY
- Class:
- GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
- Subclass:
- DYNAMO-ELECTRIC MACHINES
Filing statistics
IPC H02K 27/00 belongs to the parent subclass H02K, which 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
9 direct subcodes
Child Classifications
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- H02K 27/02 characterised by the armature winding
- H02K 27/04 having single-phase operation in series or shunt connection
- H02K 27/12 having multi-phase operation
- H02K 27/2 Structural association with a speed regulating device
- H02K 27/22 having means for improving commutation, e.g. auxiliary fields, double windings, double brushes
- H02K 27/24 having two or more commutators
- H02K 27/26 having disc armature
- H02K 27/28 Structural association with auxiliary electric devices influencing the characteristic of the machine or controlling the machine
- H02K 27/3 Structural association with auxiliary mechanical devices, e.g. with clutches or brakes
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