H02P 21/09
Field phase angle calculation based on rotor voltage equation by adding slip
Official title: Field phase angle calculation based on rotor voltage equation by adding slip frequency and speed proportional frequency
H02P21/09 (Field phase angle calculation based on rotor voltage equation by adding slip) appears on 147 US grants and 99 published applications in this corpus.
Search patents in H02P- Granted patents
- 147
- Published applications
- 99
- Assignees
- 90
- Inventors
- 303
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 4 | 0 |
| 1983 | 2 | 0 |
| 1984 | 4 | 0 |
| 1985 | 3 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 3 | 0 |
| 1995 | 6 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 8 | 0 |
| 1999 | 3 | 0 |
| 2000 | 5 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 1 |
| 2003 | 3 | 2 |
| 2004 | 0 | 1 |
| 2005 | 1 | 3 |
| 2006 | 3 | 3 |
| 2007 | 3 | 2 |
| 2008 | 2 | 3 |
| 2009 | 3 | 1 |
| 2010 | 1 | 4 |
| 2011 | 1 | 0 |
| 2012 | 4 | 3 |
| 2013 | 2 | 1 |
| 2014 | 0 | 0 |
| 2015 | 1 | 0 |
| 2016 | 0 | 1 |
| 2017 | 1 | 2 |
| 2018 | 1 | 4 |
| 2019 | 8 | 13 |
| 2020 | 14 | 13 |
| 2021 | 9 | 9 |
| 2022 | 8 | 8 |
| 2023 | 10 | 3 |
| 2024 | 0 | 8 |
| 2025 | 5 | 5 |
| 2026 | 5 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Position detection and monitoring14 Jul 2026US 12,683,530 B2Infineon Technologies Austria AG
- Method of aligning a stationary rotor of a synchronous motor at a configured rotor angle and a controller therefor26 May 2026US 12,640,631 B1Kinetic Technologies International Holdings LP
- Feedforward current control of induction machines26 May 2026US 12,640,670 B2Steering Solutions IP Holding Corporation
- Electric power generation system10 Mar 2026US 12,573,972 B2Hitachi Construction Machinery Co., Ltd.
- Method of rotor angle estimation for a multi-phase permanent magnet rotor motor6 Jan 2026US 12,519,409 B2Kinetic Technologies International Holdings LP
- Systems and methods for a permanent magnet synchronous motor8 Oct 2026US 2026/0312516 A1Schlumberger Technology Corporation
- Power tool with high and low field weakening states27 Aug 2026US 2026/0249439 A1
- Method of Controlling an Electric Motor and Control System for an Electric Motor30 Jul 2026US 2026/0221909 A1Infineon Technologies Austria AG
- Motor control device and power conversion system9 Jul 2026US 2026/0196954 A1Astemo, Ltd.
- Power conversion device and motor control system2 Jul 2026US 2026/0189163 A1Hitachi Industrial Equipment Systems Co., Ltd.
Most cited
By later US patents
- Slip control based on sensing voltage fed to an induction motor55US 5,032,771 AAllen-Bradley Company, Inc. · 1991
- Method and apparatus to regulate loads48US 6,982,533 B2Rockwell Automation Technologies, Inc. · 2006
- Field weakening induction drive46US 4,677,360 AGeneral Electric Company · 1987
- Method and apparatus for controlling AC motors42US 4,456,868 AFanuc Corporation · 1984
- Power conversion system42US 5,959,430 AKabushiki Kaisha Toshiba · 1999