H02K 19/20
With variable-reluctance soft-iron rotors without winding
Official title: with variable-reluctance soft-iron rotors without winding
H02K19/20 (With variable-reluctance soft-iron rotors without winding) appears on 83 US grants and 47 published applications in this corpus.
Search patents in H02K- Granted patents
- 83
- Published applications
- 47
- Assignees
- 56
- Inventors
- 155
- Latest grant
- 11 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 8 | 0 |
| 2000 | 5 | 0 |
| 2001 | 2 | 1 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 2 | 2 |
| 2005 | 1 | 0 |
| 2006 | 0 | 1 |
| 2007 | 1 | 3 |
| 2008 | 3 | 4 |
| 2009 | 4 | 1 |
| 2010 | 0 | 3 |
| 2011 | 3 | 2 |
| 2012 | 1 | 2 |
| 2013 | 1 | 1 |
| 2014 | 2 | 7 |
| 2015 | 0 | 2 |
| 2016 | 1 | 3 |
| 2017 | 3 | 4 |
| 2018 | 3 | 3 |
| 2019 | 3 | 2 |
| 2020 | 2 | 0 |
| 2021 | 1 | 3 |
| 2022 | 2 | 0 |
| 2023 | 0 | 2 |
| 2024 | 3 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Reluctance machine11 Nov 2025US 12,470,096 B2Borg-Warner Corporation
- Rotating electrical machine with superconducting elements and cryogenic enclosures24 Dec 2024US 12,176,789 B2Safran
- Centrifugal separator having a generator for generating an electric current4 Jun 2024US 11,998,931 B2Alfa Laval Corporate AB
- Dual-winding synchronous reluctance machine composed of an excitation winding and a separate power winding6 Feb 2024US 11,894,737 B2GE Avio S. r. l.
- Homopolar multi-core energy conversion device22 Nov 2022US 11,509,175 B1
- Reluctance machine12 Oct 2023US 2023/0327505 A1BorgWarner Inc.
- Rotating electrical machine with superconducting elements and cryogenic enclosures11 May 2023US 2023/0147036 A1Safran
- Dual-Winding Synchronous Reluctance Machine Composed of an Excitation Winding and a Separate Power Winding8 Jul 2021US 2021/0211028 A1GE Avio S. r. l.
- Centrifugal separator and method of operating a centrifugal separator20 May 2021US 2021/0146379 A1Alfa Laval Corporate AB
- Synchronous electrical machine20 May 2021US 2021/0152065 A1Safran Electrical & Power
Most cited
By later US patents
- Composite rotor lamination for use in reluctance hompolar, and permanent magnet machines68US 4,916,346 AGeneral Electric Company · 1990
- Electric power generation using power turbine aft of LPT61US 7,514,810 B2General Electric Company · 2009
- Airgap armature coils and electric machines using same57US 6,166,472 AActive Power, Inc. · 2000
- Method of fabricating composite rotor laminations for use in reluctance, homopolar and permanent magnet machines53US 4,918,831 AGeneral Electric Company · 1990
- Stator support structure with stamped end plates48US 4,864,176 AREM Technologies, Inc. · 1989