Wound-field rotor
US-2025385581-A1 · Dec 18, 2025 · US
for self-excitation
for self-excitation · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H02K19/28 |
| Official title | for self-excitation |
| Display label | for self-excitation |
| Total patents | 61 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 7 |
| 2016 | 8 |
| 2017 | 3 |
| 2018 | 7 |
| 2019 | 10 |
| 2020 | 7 |
| 2021 | 3 |
| 2022 | 5 |
| 2023 | 3 |
| 2024 | 4 |
| 2025 | 3 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Architecture for an electric power generator for aviation
US-12334785-B2 · Jun 17, 2025 · US
Rectifier assemblies
US-2025055352-A1 · Feb 13, 2025 · US
Dual axis alternator
US-2024141827-A1 · May 2, 2024 · US
Dual axis alternator
US-11905878-B2 · Feb 20, 2024 · US
Externally excited synchronous machine and motor vehicle
US-2024014712-A1 · Jan 11, 2024 · US
Field winding type rotating electric machine
US-2024006967-A1 · Jan 4, 2024 · US
Self-excited brushless machine with compensated field windings
US-2023369929-A1 · Nov 16, 2023 · US
Architecture for an electric power generator for aviation
US-2023216387-A1 · Jul 6, 2023 · US
High-speed edge-wound rotor
US-11611255-B2 · Mar 21, 2023 · US
High-speed edge-wound rotor
US-2022239175-A1 · Jul 28, 2022 · US
Dual Axis Alternator
US-2022170416-A1 · Jun 2, 2022 · US
Dual axis alternator
US-11286848-B2 · Mar 29, 2022 · US
Field-winding-type rotating electric machine
US-11251688-B2 · Feb 15, 2022 · US
Field coil type rotating electric machine
US-11218065-B2 · Jan 4, 2022 · US
Driving system and method for a wound rotor synchronous generator
US-11128246-B2 · Sep 21, 2021 · US
Field excitation system and method for a wound rotor synchronous generator
US-2021203259-A1 · Jul 1, 2021 · US
Field winding type rotary machine
US-11050330-B2 · Jun 29, 2021 · US
Field-winding-type rotating electric machine
US-2020373822-A1 · Nov 26, 2020 · US
Field coil type rotating electric machine
US-2020373823-A1 · Nov 26, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H02K19/28?
- CPC H02K19/28 is the Cooperative Patent Classification code for “for self-excitation.”
- How many patents are filed under CPC H02K19/28 (for self-excitation)?
- Our database includes 61 publications tagged with this CPC code.
- Is patent activity under CPC H02K19/28 growing?
- Publication counts under this code: 4 in 2024 vs 3 in 2025 (latest complete years).