H02K 3/20
For auxiliary purposes
Official title: for auxiliary purposes, e.g. damping or commutating
H02K3/20 (For auxiliary purposes) appears on 117 US grants and 106 published applications in this corpus.
Search patents in H02K- Granted patents
- 117
- Published applications
- 106
- Assignees
- 79
- Inventors
- 264
- Latest grant
- 9 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 0 |
| 2002 | 2 | 2 |
| 2003 | 0 | 1 |
| 2004 | 3 | 0 |
| 2005 | 0 | 2 |
| 2006 | 2 | 3 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 4 |
| 2010 | 4 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 8 |
| 2013 | 1 | 2 |
| 2014 | 3 | 8 |
| 2015 | 2 | 4 |
| 2016 | 7 | 8 |
| 2017 | 6 | 5 |
| 2018 | 6 | 9 |
| 2019 | 11 | 18 |
| 2020 | 14 | 13 |
| 2021 | 8 | 4 |
| 2022 | 11 | 4 |
| 2023 | 4 | 2 |
| 2024 | 1 | 3 |
| 2025 | 0 | 1 |
| 2026 | 1 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Wirelessly transferring power within an electric machine having AC and DC rotor coils9 Jun 2026US 12,651,992 B2Tau Motors, Inc.
- Cogging-torque actuator23 Apr 2024US 11,967,871 B2University of Utah Research Foundation
- Disc-type ironless permanent magnet synchronous generator powered by auxiliary power supply21 Nov 2023US 11,824,412 B2
- Electric motor and a method of assembling same16 May 2023US 11,652,380 B2Steering Solutions IP Holding Corporation
- Claw pole motor with a ring coil and a meandering coil14 Feb 2023US 11,581,762 B2Moog Inc.
- Rotating electric machine30 Jul 2026US 2026/0221848 A1Denso Corporation
- Bearingless motor25 Jun 2026US 2026/0180395 A1Panasonic Intellectual Property Management Co., Ltd.
- Self-excited brushless machine with compensated field windings11 Jun 2026US 2026/0163431 A1The Texas A&M University System
- Wirelessly transferring power within an electric machine having ac and dc rotor coils14 May 2026US 2026/0135502 A1Tau Motors, Inc.
- Bearingless motor system, compressor, and refrigeration apparatus13 Nov 2025US 2025/0350173 A1Daikin Industries, Ltd.
Most cited
By later US patents
- Methods and apparatus for increasing power of permanent magnet motors1,432US 6,777,838 B22004
- High-power low-RPM DC motor54US 6,194,799 B12001
- Self-supporting amortisseur cage for high-speed synchronous machine solid rotor48US 4,117,360 AGeneral Electric Company · 1978
- High power low RPM D.C. motor34US 6,037,692 A2000
- Methods and apparatus for increasing power of permanent magnet motors29US 6,472,784 B22002