Electric machine and motor vehicle with wall element and tooth head ring
US-12580432-B2 · Mar 17, 2026 · US
Means for mechanical adjustment of the excitation flux
Means for mechanical adjustment of the excitation flux · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H02K21/021 |
| Official title | {Means for mechanical adjustment of the excitation flux} |
| Display label | Means for mechanical adjustment of the excitation flux |
| Total patents | 43 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 1 |
| 2017 | 7 |
| 2018 | 4 |
| 2019 | 6 |
| 2020 | 4 |
| 2021 | 3 |
| 2022 | 2 |
| 2023 | 5 |
| 2024 | 3 |
| 2025 | 6 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Dual-rotor motor
US-12500499-B2 · Dec 16, 2025 · US
A rotor topology for very high speed permanent magnet machines
US-2025141286-A1 · May 1, 2025 · US
Electric motor and handwheel actuator assembly incorporating a motor
US-2025125670-A1 · Apr 17, 2025 · US
Circumferential flux electric machine with field weakening mechanisms and methods of use
US-12272998-B2 · Apr 8, 2025 · US
Dual rotor motor
US-12237736-B2 · Feb 25, 2025 · US
Dual rotor motor
US-12191724-B2 · Jan 7, 2025 · US
Dual-rotor motor
US-2024380293-A1 · Nov 14, 2024 · US
Axial flux electric machine including skewed poles
US-2024128845-A1 · Apr 18, 2024 · US
Electric machine and motor vehicle
US-2024120782-A1 · Apr 11, 2024 · US
Circumferential flux electric machine with field weakening mechanisms and methods of use
US-11784546-B2 · Oct 10, 2023 · US
Dual rotor motor
US-2023318422-A1 · Oct 5, 2023 · US
Dual rotor motor
US-2023318421-A1 · Oct 5, 2023 · US
Permanent magnet motor with field weakening arrangement
US-11689087-B2 · Jun 27, 2023 · US
Electric motor with selective flux stator
US-11545882-B2 · Jan 3, 2023 · US
Circumferential flux electric machine with field weakening mechanisms and methods of use
US-2022115936-A1 · Apr 14, 2022 · US
Electric Motor with Selective Flux Stator
US-2022045586-A1 · Feb 10, 2022 · US
Permanent magnet motor with field weakening arrangement
US-2021376705-A1 · Dec 2, 2021 · US
Circumferential flux electric machine with field weakening mechanisms and methods of use
US-11159076-B2 · Oct 26, 2021 · US
Line-start synchronous reluctance motor and rotor thereof
US-10916979-B2 · Feb 9, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H02K21/021?
- CPC H02K21/021 is the Cooperative Patent Classification code for “Means for mechanical adjustment of the excitation flux.”
- How many patents are filed under CPC H02K21/021 (Means for mechanical adjustment of the excitation flux)?
- Our database includes 43 publications tagged with this CPC code.
- Is patent activity under CPC H02K21/021 growing?
- Publication counts under this code: 3 in 2024 vs 6 in 2025 (latest complete years).