Wirelessly transferring power within an electric machine with actively rectified rotor windings
US-2024195269-A1 · Jun 13, 2024 · US
Brushless excitation
Brushless 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 | H02P9/302 |
| Official title | {Brushless excitation} |
| Display label | Brushless excitation |
| Total patents | 139 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 9 |
| 2016 | 19 |
| 2017 | 18 |
| 2018 | 21 |
| 2019 | 26 |
| 2020 | 11 |
| 2021 | 8 |
| 2022 | 7 |
| 2023 | 7 |
| 2024 | 9 |
| 2025 | 3 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Aircraft starting and generating system
US-10141875-B2 · Nov 27, 2018 · US
Doubly stator-fed synchronous generator
US-10122307-B2 · Nov 6, 2018 · US
Systems and methods concerning exciterless synchronous machines
US-10097123-B2 · Oct 9, 2018 · US
Main field voltage limiter in brushless synchronous machines
US-10084409-B2 · Sep 25, 2018 · US
Sensorless control of a dc synchronous machine
US-2018269752-A1 · Sep 20, 2018 · US
Sensorless control of a DC synchronous machine
US-10033252-B2 · Jul 24, 2018 · US
Double stator permanent magnet machine with magnetic flux regulation
US-2018198395-A1 · Jul 12, 2018 · US
Excitation device of AC exciter
US-10020765-B2 · Jul 10, 2018 · US
Alternator Controller
US-2018131301-A1 · May 10, 2018 · US
Alternator controller
US-9935571-B2 · Apr 3, 2018 · US
Method and power converter unit for operating a generator
US-9917544-B2 · Mar 13, 2018 · US
Aircraft starting and generating system
US-2018034395-A1 · Feb 1, 2018 · US
Systems and methods concerning exciterless synchronous machines
US-2018034396-A1 · Feb 1, 2018 · US
Reconfigurable multi-permanent magnet generator based power generating system
US-2017359011-A1 · Dec 14, 2017 · US
System and method for vehicle diagnostics
US-2017331402-A1 · Nov 16, 2017 · US
Systems and methods concerning exciterless synchronous machines
US-9813004-B2 · Nov 7, 2017 · US
Controller For A Separately Excited Electric Generator In A Vehicle Electrical System Of A Motor Vehicle
US-2017310260-A1 · Oct 26, 2017 · US
Rotating transformers for electrical machines
US-9793046-B2 · Oct 17, 2017 · US
Power generation system
US-2017237373-A1 · Aug 17, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H02P9/302?
- CPC H02P9/302 is the Cooperative Patent Classification code for “Brushless excitation.”
- How many patents are filed under CPC H02P9/302 (Brushless excitation)?
- Our database includes 139 publications tagged with this CPC code.
- Is patent activity under CPC H02P9/302 growing?
- Publication counts under this code: 9 in 2024 vs 3 in 2025 (latest complete years).