H02P 25/089
Sensorless control
Official title: Sensorless control (direct torque control H02P23/30)
H02P25/089 (Sensorless control) appears on 193 US grants and 116 published applications in this corpus.
Search patents in H02P- Granted patents
- 193
- Published applications
- 116
- Assignees
- 98
- Inventors
- 283
- Latest grant
- 28 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 3 | 0 |
| 1992 | 9 | 0 |
| 1993 | 8 | 0 |
| 1994 | 11 | 0 |
| 1995 | 8 | 0 |
| 1996 | 3 | 0 |
| 1997 | 3 | 0 |
| 1998 | 5 | 0 |
| 1999 | 7 | 0 |
| 2000 | 5 | 0 |
| 2001 | 10 | 4 |
| 2002 | 6 | 4 |
| 2003 | 6 | 4 |
| 2004 | 4 | 7 |
| 2005 | 6 | 6 |
| 2006 | 3 | 3 |
| 2007 | 6 | 3 |
| 2008 | 2 | 2 |
| 2009 | 1 | 2 |
| 2010 | 1 | 8 |
| 2011 | 2 | 3 |
| 2012 | 7 | 1 |
| 2013 | 3 | 2 |
| 2014 | 4 | 4 |
| 2015 | 2 | 5 |
| 2016 | 4 | 7 |
| 2017 | 7 | 8 |
| 2018 | 8 | 7 |
| 2019 | 6 | 8 |
| 2020 | 7 | 9 |
| 2021 | 9 | 3 |
| 2022 | 8 | 9 |
| 2023 | 4 | 3 |
| 2024 | 5 | 2 |
| 2025 | 2 | 2 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Controller for a switched reluctance machine28 Apr 2026US 12,614,999 B2Hamilton Sundstrand Corporation
- System and method for permanent magnet assisted synchronous reluctance motor control from zero or low speed2 Sep 2025US 12,407,230 B2Wolong Electric Group Co., Ltd.
- Acoustic noise reduction for switched reluctance machines8 Jul 2025US 12,355,384 B2Enedym Inc.
- Manufacturing-sensitive control of high rotor pole switched reluctance motors29 Oct 2024US 12,132,427 B2Turntide Technologies, Inc.
- Method for positioning rotor of switched reluctance motor with pulse number being self-adjustable along with speed6 Aug 2024US 12,057,793 B2Changsha University of Science and Technology
- Acoustic noise reduction for switched reluctance machines20 Mar 2025US 2025/0096716 A1Enedym Inc.
- System and method for permanent magnet assisted synchronous reluctance motor control from zero or low speed20 Feb 2025US 2025/0062668 A1Wolong Electric Group Co., Ltd.
- Controller for a switched reluctance machine15 Aug 2024US 2024/0275322 A1Hamilton Sundstrand Corporation
- Method for Positioning Rotor of Switched Reluctance Motor with Pulse Number Being Self-adjustable along with Speed27 Jun 2024US 2024/0213899 A1Changsha University of Science and Technology
- Manufacturing-sensitive control of high rotor pole switched reluctance motors29 Jun 2023US 2023/0208336 A1Turntide Technologies, Inc.
Most cited
By later US patents
- Rotor position estimator for switched reluctance motor85US 4,772,839 AGeneral Electric Company · 1988
- Switched reluctance motor control circuit with energy recovery capability72US 5,075,610 AHoneywell Inc. · 1991
- Sensorless commutation controller for a poly-phase dynamoelectric machine69US 5,457,375 AEmerson Electric Co. · 1995
- Method and apparatus for implementing sensorless control of a switched reluctance machine63US 5,929,590 AEmerson Electric Co. · 1999
- Switched reluctance motor position by resonant signal injection58US 5,196,775 AHoneywell Inc. · 1993