H02K 21/20
Having windings each turn of which co-operates only with poles of one
Official title: having windings each turn of which co-operates only with poles of one polarity, e.g. homopolar machine
H02K21/20 (Having windings each turn of which co-operates only with poles of one) appears on 64 US grants and 49 published applications in this corpus.
Search patents in H02K- Granted patents
- 64
- Published applications
- 49
- Assignees
- 50
- Inventors
- 127
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 0 | 3 |
| 2004 | 1 | 2 |
| 2005 | 2 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 2 | 3 |
| 2010 | 0 | 1 |
| 2011 | 4 | 6 |
| 2012 | 1 | 0 |
| 2013 | 2 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 3 |
| 2019 | 0 | 4 |
| 2020 | 4 | 2 |
| 2021 | 4 | 3 |
| 2022 | 1 | 7 |
| 2023 | 1 | 4 |
| 2024 | 7 | 4 |
| 2025 | 4 | 0 |
| 2026 | 3 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Galvanometer motor11 Aug 2026US 12,704,529 B2Suteng Innovation Technology Co., Ltd.
- Assembly for an electric machine2 Jun 2026US 12,647,001 B2Rolls-Royce Deutschland Ltd & Co KG
- Motor safety control method and robot for implementing the same26 May 2026US 12,640,667 B2LG Electronics Inc.
- Rotating electric machine21 Oct 2025US 12,451,752 B2Kabushiki Kaisha Toyota Jidoshokki
- Planar vessel mixing using a brushless drive surrounding the reaction space16 Sep 2025US 12,415,167 B1Honeywell Federal Manufacturing & Technologies, LLC
- Motor safety control method and robot for implementing the same10 Sep 2026US 2026/0269752 A1LG Electronics Inc.
- Adding rotors in series2 Jul 2026US 2026/0189115 A1Nextpower360 Co.
- Electric motor25 Jun 2026US 2026/0180383 A1Toyota Jidosha Kabushiki Kaisha
- Brushless motor9 Apr 2026US 2026/0100623 A1Orbray Co., Ltd.
- Rare-earth-free permanent magnet motor29 Jan 2026US 2026/0031664 A1University of Pittsburgh—Of the Commonwealth System of Higher Education
Most cited
By later US patents
- Hybrid-energized electric machine98US 5,672,926 ASiemens Aktiengesellschaft · 1997
- Variable reluctance motors with permanent magnet excitation73US 5,304,882 AElectric Power Research Institute, Inc. · 1994
- Dynamoelectric machine composed of sectors having transverse fluxes72US 5,543,674 ARadio Energie · 1996
- Flat hybrid stepper or synchronous motor66US 4,764,697 AU. S. Philips Corporation · 1988
- Efficient permanent magnet electric motor63US 5,258,697 AVarelux Motor Corp. · 1993