H02P 27/05
Using ac supply for both the rotor and the stator circuits, the
Official title: using AC supply for both the rotor and the stator circuits, the frequency of supply to at least one circuit being variable
H02P27/05 (Using ac supply for both the rotor and the stator circuits, the) appears on 35 US grants and 29 published applications in this corpus.
Search patents in H02P- Granted patents
- 35
- Published applications
- 29
- Assignees
- 40
- Inventors
- 90
- Latest grant
- 21 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 1 | 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 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 1 |
| 2006 | 2 | 0 |
| 2007 | 0 | 2 |
| 2008 | 1 | 1 |
| 2009 | 2 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 3 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 2 | 0 |
| 2015 | 1 | 0 |
| 2016 | 1 | 1 |
| 2017 | 0 | 1 |
| 2018 | 2 | 4 |
| 2019 | 5 | 3 |
| 2020 | 1 | 0 |
| 2021 | 2 | 3 |
| 2022 | 1 | 1 |
| 2023 | 2 | 1 |
| 2024 | 0 | 5 |
| 2025 | 3 | 1 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Rotor-to-stator reduction factor evaluation for externally-excited synchronous machines21 Apr 2026US 12,609,644 B2ABB Schweiz AG
- Electric vehicle dual use inverter24 Mar 2026US 12,583,344 B1GM Global Technology Operations LLC
- Electric drive system with static pulsed power transfer25 Nov 2025US 12,483,170 B2GM Global Technology Operations LLC
- Motor control system28 Oct 2025US 12,456,942 B2Toyota Jidosha Kabushiki Kaisha
- Electrical switching device, electrical drive layout and motor vehicle24 Jun 2025US 12,342,510 B2Audi AG
- Electric drive system with static pulsed power transfer21 Aug 2025US 2025/0266778 A1GM Global Technology Operations LLC
- Method and device for operating an inverter19 Dec 2024US 2024/0421742 A1Robert Bosch GmbH
- Externally excited electric machine with a natural boost voltage31 Oct 2024US 2024/0364250 A1Tula eTechnology, Inc.
- Device for the de-excitation of at least one rotor winding of a synchronous motor, synchronous motor, method for operating a synchronous motor, motor vehicle5 Sep 2024US 2024/0297604 A1ZF Friedrichshafen AG
- Motor control system25 Jul 2024US 2024/0250632 A1Toyota Jidosha Kabushiki Kaisha
Most cited
By later US patents
- Brushless doubly-fed motor control system76US 5,239,251 AState of Oregon acting by and through the State Board of Higher Education on behalf of Oregon State University · 1993
- Control system for doubly fed induction generator40US 7,411,309 B2Xantrex Technology Inc. · 2008
- Controller for a wound rotor slip ring induction machine32US 6,448,735 B1ABB Automation Inc. · 2002
- Controller for a wound rotor slip ring induction machine23US 6,741,059 B2ABB Automation Inc. · 2004
- Methods and apparatus for controlling a motor/generator19US 7,116,073 B1Innovative Power Solutions, LLC · 2006