H02K 17/22
Having rotors with windings connected to slip-rings
Official title: having rotors with windings connected to slip-rings
H02K17/22 (Having rotors with windings connected to slip-rings) appears on 23 US grants and 28 published applications in this corpus.
Search patents in H02K- Granted patents
- 23
- Published applications
- 28
- Assignees
- 26
- Inventors
- 70
- Latest grant
- 16 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 1 | 2 |
| 2015 | 1 | 6 |
| 2016 | 1 | 0 |
| 2017 | 2 | 2 |
| 2018 | 0 | 3 |
| 2019 | 3 | 0 |
| 2020 | 2 | 3 |
| 2021 | 1 | 0 |
| 2022 | 1 | 4 |
| 2023 | 1 | 1 |
| 2024 | 2 | 4 |
| 2025 | 4 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Rotating electrical machine, set of such machines, and associated boat and rolling mill16 Sep 2025US 12,418,228 B2GE Energy Power Conversion Technology Limited
- Wound-rotor electric machine2 Sep 2025US 12,407,226 B2GM Global Technology Operations LLC
- Dynamoelectric machine having cooling of the slip ring system4 Mar 2025US 12,244,189 B2Flender GmbH
- Electromagnetic machine using magnetic field binding of multiple multi-phase winding wires25 Feb 2025US 12,237,737 B2
- AC machine controlled via amplitude modulation3 Sep 2024US 12,081,160 B2
- Doubly fed induction machine for series hybrid applications3 Apr 2025US 2025/0112520 A1Schaeffler Technologies AG & Co. KG
- Rotor for an electric machine12 Dec 2024US 2024/0413695 A1Voith Patent GmbH
- Rotating electrical machine, set of such machines, and associated boat and rolling mill13 Jun 2024US 2024/0195275 A1GE Energy Power Conversion Technology Limited
- Dynamoelectric machine having cooling of the slip ring system16 May 2024US 2024/0162794 A1Flender GmbH
- Wound-rotor electric machine18 Jan 2024US 2024/0022141 A1GM Global Technology Operations LLC
Most cited
By later US patents
- Variable speed induction motor29US 4,019,104 A1977
- Hybrid-secondary uncluttered induction machine13US 6,310,417 B1Lockheed Martin Energy Research Corporation · 2001
- Short-circuiting and brush-lifting device for asynchronous motors equipped with a slip-ring rotor10US 5,285,125 ASiemens Aktiengesellschaft · 1994
- Electronically controlled universal motor10US 9,130,433 B2Arm Limited · 2015
- Electronic shorting of wound rotor windings4US 6,628,101 B2General Electric Company · 2003