H02P 23/08
Controlling based on slip frequency
Official title: Controlling based on slip frequency, e.g. adding slip frequency and speed proportional frequency
H02P23/08 (Controlling based on slip frequency) appears on 140 US grants and 66 published applications in this corpus.
Search patents in H02P- Granted patents
- 140
- Published applications
- 66
- Assignees
- 90
- Inventors
- 241
- Latest grant
- 8 Apr 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 6 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 4 | 0 |
| 1982 | 8 | 0 |
| 1983 | 3 | 0 |
| 1984 | 3 | 0 |
| 1985 | 6 | 0 |
| 1986 | 5 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 4 | 0 |
| 1994 | 1 | 0 |
| 1995 | 4 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 6 | 0 |
| 1999 | 4 | 0 |
| 2000 | 6 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 0 |
| 2003 | 1 | 1 |
| 2004 | 1 | 4 |
| 2005 | 3 | 1 |
| 2006 | 1 | 0 |
| 2007 | 0 | 2 |
| 2008 | 1 | 3 |
| 2009 | 1 | 3 |
| 2010 | 2 | 4 |
| 2011 | 2 | 1 |
| 2012 | 2 | 3 |
| 2013 | 3 | 5 |
| 2014 | 3 | 3 |
| 2015 | 4 | 4 |
| 2016 | 2 | 5 |
| 2017 | 3 | 2 |
| 2018 | 4 | 6 |
| 2019 | 5 | 5 |
| 2020 | 8 | 2 |
| 2021 | 1 | 3 |
| 2022 | 5 | 4 |
| 2023 | 2 | 3 |
| 2024 | 2 | 1 |
| 2025 | 2 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Systems and methods for speed regulation of induction motors8 Apr 2025US 12,273,057 B2King Fahd University of Petroleum and Minerals
- Superconducting rotating machine and method of controlling superconducting rotating machine1 Apr 2025US 12,267,031 B2Kyoto University
- Control of an induction generator of a wind turbine10 Sep 2024US 12,088,236 B2Siemens Gamesa Renewable Energy Innovation & Technology S.L.
- Variable-gauge train control apparatus3 Sep 2024US 12,077,196 B2Kyushu Railway Company
- Determination of operation mode for AC asynchronous three-phrase motor in escalator system19 Sep 2023US 11,764,716 B1Otis Elevator Company
- System and method utilizing a variable frequency device for speed regulation of induction motor26 Jun 2025US 2025/0211156 A1King Fahd University of Petroleum and Minerals
- Systems and methods for speed regulation of induction motors19 Sep 2024US 2024/0313685 A1King Fahd University of Petroleum and Minerals
- Superconducting rotating machine and method of controlling superconducting rotating machine28 Dec 2023US 2023/0421083 A1Kyoto University
- Determination of operation mode for ac asynchronous three-phrase motor in escalator system5 Oct 2023US 2023/0318502 A1Otis Elevator Company
- Control of an induction generator of a wind turbine16 Mar 2023US 2023/0079096 A1Siemens Gamesa Renewable Energy Innovation & Technology S.L.
Most cited
By later US patents
- High speed deep well pump for residential use114US 5,883,489 AGeneral Electric Company · 1999
- Ground fault detection and protection method for a variable speed ac electric motor101US 5,945,802 AGeneral Electric Company · 1999
- Air conditioning apparatus92US 5,088,297 AHitachi, Ltd. · 1992
- Adjustable speed AC drive system control for operation in pulse width modulation and quasi-square wave modes58US 4,926,104 AGeneral Electric Company · 1990
- Dynamic braking in controlled current motor drive systems55US 4,039,914 AGeneral Electric Company · 1977