H02P 21/16
Estimation of constants
Official title: Estimation of constants, e.g. the rotor time constant
H02P21/16 (Estimation of constants) appears on 218 US grants and 231 published applications in this corpus.
Search patents in H02P- Granted patents
- 218
- Published applications
- 231
- Assignees
- 124
- Inventors
- 538
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 3 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 4 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 2 | 0 |
| 1999 | 5 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 1 |
| 2002 | 2 | 2 |
| 2003 | 5 | 4 |
| 2004 | 4 | 3 |
| 2005 | 3 | 6 |
| 2006 | 5 | 2 |
| 2007 | 3 | 9 |
| 2008 | 3 | 7 |
| 2009 | 6 | 6 |
| 2010 | 6 | 7 |
| 2011 | 3 | 7 |
| 2012 | 6 | 12 |
| 2013 | 14 | 5 |
| 2014 | 9 | 10 |
| 2015 | 8 | 7 |
| 2016 | 8 | 4 |
| 2017 | 5 | 1 |
| 2018 | 1 | 5 |
| 2019 | 10 | 16 |
| 2020 | 9 | 18 |
| 2021 | 16 | 17 |
| 2022 | 12 | 18 |
| 2023 | 18 | 12 |
| 2024 | 8 | 14 |
| 2025 | 20 | 26 |
| 2026 | 4 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Synchronous machine control device, synchronous machine control method, and electric vehicle31 Mar 2026US 12,592,657 B2Hitachi Astemo, Ltd.
- Synchronization of multiple axes in a motor drive24 Mar 2026US 12,587,121 B2Rockwell Automation Technologies, Inc.
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- Direct discrete-time current controller for virtually-translated alternating current machine2 Dec 2025US 12,485,776 B2GM Global Technology Operations LLC
- Method of identifying the parameters of a permanent magnet synchronous motor8 Oct 2026US 2026/0312518 A1Arol S.P.A.
- Rotary electric machine control device, electric power steering device, and vehicle8 Oct 2026US 2026/0312519 A1Mitsubishi Electric Mobility Corporation
- System and method of detecting fault in the current sensing function of an electric motor controller24 Sep 2026US 2026/0291417 A1NXP B. V.
- Motor control device and power conversion system9 Jul 2026US 2026/0196954 A1Astemo, Ltd.
- Motor driving apparatus and method for controlling the same2 Jul 2026US 2026/0189164 A1Hyundai Motor Company
Most cited
By later US patents
- Self commissioning controller for field-oriented elevator motor/drive system84US 5,929,400 AOtis Elevator Company · 1999
- Stator and rotor resistance identifier using high frequency injection62US 6,636,012 B2Rockwell Automation Technologies, Inc. · 2003
- Method and system for starting a sensorless motor62US 7,652,441 B2International Rectifier Corporation · 2010
- Position-sensorless motor control method and apparatus53US 6,788,024 B2Hitachi, Ltd. · 2004
- Constant detecting apparatus for brushless DC motor, control apparatus for brushless DC motor, and program for detecting constant of brushless DC motor41US 6,700,400 B2Honda Giken Kogyo Kabushiki Kaisha · 2004