H02K 21/04
Windings on magnets for additional excitation
Official title: Windings on magnets for additional excitation {; Windings and magnets for additional excitation}
H02K21/04 (Windings on magnets for additional excitation) appears on 540 US grants and 491 published applications in this corpus.
Search patents in H02K- Granted patents
- 540
- Published applications
- 491
- Assignees
- 199
- Inventors
- 755
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 4 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 9 | 0 |
| 1997 | 7 | 0 |
| 1998 | 14 | 0 |
| 1999 | 18 | 0 |
| 2000 | 24 | 0 |
| 2001 | 17 | 3 |
| 2002 | 17 | 14 |
| 2003 | 11 | 16 |
| 2004 | 20 | 21 |
| 2005 | 20 | 18 |
| 2006 | 16 | 15 |
| 2007 | 8 | 25 |
| 2008 | 14 | 13 |
| 2009 | 13 | 24 |
| 2010 | 20 | 33 |
| 2011 | 23 | 25 |
| 2012 | 30 | 13 |
| 2013 | 12 | 30 |
| 2014 | 13 | 23 |
| 2015 | 20 | 12 |
| 2016 | 17 | 16 |
| 2017 | 18 | 27 |
| 2018 | 18 | 22 |
| 2019 | 35 | 36 |
| 2020 | 23 | 18 |
| 2021 | 20 | 19 |
| 2022 | 17 | 26 |
| 2023 | 9 | 11 |
| 2024 | 19 | 14 |
| 2025 | 10 | 11 |
| 2026 | 6 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Brushless DC motor power tool with combined PCB design29 Sep 2026US 12,749,945 B2Milwaukee Electric Tool Corporation
- Axial air gap electric rotary motor25 Aug 2026US 12,719,341 B2Moog Inc.
- Permanent magnet energy convertor11 Aug 2026US 12,706,492 B2Rubicon Energy BV
- Brushless alternator5 May 2026US 12,620,849 B2Rapid Power Industries
- Wide-speed multiple interior rotor excitation machine14 Apr 2026US 12,603,556 B2Gentiam LLC
- Electric machine with transition zone field winding27 Aug 2026US 2026/0254333 A1
- Modular variable pole electric motor system20 Aug 2026US 2026/0246322 A1GM Global Technology Operations LLC
- Brushless alternator18 Jun 2026US 2026/0171859 A1Rapid Power Industries
- Switched reluctance motor comprising permanent magnets14 May 2026US 2026/0135453 A1
- Crown brushless motor device and method19 Mar 2026US 2026/0081508 A1Concept Design
Most cited
By later US patents
- Electric machine having an integrally continuous stator winding and stator slot bridges1,193US 6,936,948 B2Pratt & Whitney Canada Corp. · 2005
- Hybrid alternator213US 5,747,909 AEcoair Corp. · 1998
- Alternator for an automotive vehicle130US 5,998,903 ADenso Corporation · 1999
- Rotating electrical machine with electromagnetic and permanent magnet excitation101US 5,663,605 AFord Motor Company · 1997
- Alternating current generator100US 4,959,577 AGeneral Motors Corporation · 1990