H02K 21/027
Conical air gap machines
Official title: {Conical air gap machines}
H02K21/027 (Conical air gap machines) appears on 13 US grants and 13 published applications in this corpus.
Search patents in H02K- Granted patents
- 13
- Published applications
- 13
- Assignees
- 13
- Inventors
- 43
- Latest grant
- 29 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 2 |
| 2008 | 2 | 0 |
| 2009 | 1 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 0 | 0 |
| 2015 | 0 | 2 |
| 2016 | 1 | 0 |
| 2017 | 1 | 1 |
| 2018 | 0 | 1 |
| 2019 | 1 | 0 |
| 2020 | 1 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 1 | 2 |
| 2024 | 0 | 0 |
| 2025 | 2 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Electric machine29 Jul 2025US 12,374,975 B2General Electric Company
- Electrical radial flow machine and powertrain15 Jul 2025US 12,362,639 B2Schaeffler Technologies AG & Co. KG
- Electric machine14 Mar 2023US 11,606,011 B2General Electric Company
- Rigid rotor structures for conical air gap electrodynamic machines21 Apr 2020US 10,630,121 B1Regal Beloit America, Inc.
- Electrical machine including a magnetic flux weakening apparatus16 Apr 2019US 10,263,500 B2Volkswagen Aktiengesellschaft
- Magnetic hysteresis brake with adjustable air gap13 Aug 2026US 2026/0238081 A1Safran Electronics & Defense Actuation
- Electric machine7 Dec 2023US 2023/0396139 A1General Electric Company
- Electrical radial flow machine and powertrain6 Jul 2023US 2023/0216388 A1Schaeffler Technologies AG & Co. KG
- Electric machine10 Feb 2022US 2022/0045587 A1General Electric Company
- Electrical machine including a magnetic flux weakening apparatus24 May 2018US 2018/0145575 A1Volkswagen Aktiengesellschaft
Most cited
By later US patents
- Regulated permanent magnet generator45US 6,455,975 B1Pacific Scientific Electro Kinetics Division · 2002
- Alternator42US 4,920,295 A1990
- Self-adjusting airgap motor/generator for flywheel system34US 5,627,419 AUnited Technologies Corporation · 1997
- Permanent magnet dynamoelectric machine with axially displaceable permanent magnet rotor assembly30US 7,385,332 B2Hamilton Sundstrand Corporation · 2008
- Relative drive device6US 7,479,722 B2Seiko Epson Corporation · 2009