H02P 9/14
Arrangements for controlling electric generators for the purpose of obtaining a desired
Official title: by variation of field (H02P9/08, H02P9/10 take precedence)
H02P9/14 (Arrangements for controlling electric generators for the purpose of obtaining a desired) appears on 1,066 US grants and 822 published applications in this corpus.
Search patents in H02P- Granted patents
- 1,066
- Published applications
- 822
- Assignees
- 377
- Inventors
- 1,742
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 11 | 0 |
| 1978 | 5 | 0 |
| 1979 | 5 | 0 |
| 1980 | 7 | 0 |
| 1981 | 7 | 0 |
| 1982 | 3 | 0 |
| 1983 | 4 | 0 |
| 1984 | 7 | 0 |
| 1985 | 4 | 0 |
| 1986 | 6 | 0 |
| 1987 | 9 | 0 |
| 1988 | 6 | 0 |
| 1989 | 5 | 0 |
| 1990 | 8 | 0 |
| 1991 | 16 | 0 |
| 1992 | 11 | 0 |
| 1993 | 14 | 0 |
| 1994 | 5 | 0 |
| 1995 | 12 | 0 |
| 1996 | 20 | 0 |
| 1997 | 15 | 0 |
| 1998 | 26 | 0 |
| 1999 | 23 | 0 |
| 2000 | 31 | 0 |
| 2001 | 27 | 8 |
| 2002 | 33 | 46 |
| 2003 | 31 | 43 |
| 2004 | 54 | 24 |
| 2005 | 21 | 27 |
| 2006 | 32 | 38 |
| 2007 | 35 | 33 |
| 2008 | 26 | 34 |
| 2009 | 32 | 43 |
| 2010 | 29 | 33 |
| 2011 | 28 | 29 |
| 2012 | 23 | 30 |
| 2013 | 28 | 31 |
| 2014 | 25 | 32 |
| 2015 | 33 | 48 |
| 2016 | 43 | 36 |
| 2017 | 36 | 50 |
| 2018 | 50 | 40 |
| 2019 | 47 | 49 |
| 2020 | 55 | 41 |
| 2021 | 24 | 30 |
| 2022 | 29 | 17 |
| 2023 | 16 | 19 |
| 2024 | 20 | 17 |
| 2025 | 13 | 15 |
| 2026 | 9 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H02P 9/26Using discharge tubes or semiconductor devices868
- H02P 9/36Using armature-reaction-excited machines32
- H02P 9/38Self-excitation by current derived from rectification of both output voltage and output31
- H02P 9/34Using magnetic devices with controllable degree of saturation in combination with controlled12
- H02P 9/32Using magnetic devices with controllable degree of saturation9
- H02P 9/16Due to variation of ohmic resistance in field circuit, using resistances switched7
- H02P 9/24Due to variation of make-to-break ratio of intermittently-operating contacts2
- H02P 9/20Due to variation of continuously-variable ohmic resistance1
Recent patents
- Automatic voltage regulator for a generator25 Aug 2026US 12,719,393 B2Discovery Energy, LLC
- Exciter circuit for a synchronous machine18 Aug 2026US 12,712,478 B2Brush Electrical Machines Limited
- Digital logic compatible inputs in compound semiconductor circuits7 Jul 2026US 12,676,615 B2Renesas Electronics America Inc.
- Wirelessly transferring power within an electric machine having AC and DC rotor coils9 Jun 2026US 12,651,992 B2Tau Motors, Inc.
- Brushless alternator5 May 2026US 12,620,849 B2Rapid Power Industries
- Alternator modulation for control of exhaust heating element1 Oct 2026US 2026/0304562 A1PACCAR Inc
- Systems and methods for rotor field excitation circuit24 Sep 2026US 2026/0291422 A1BorgWarner Inc.
- Cascade activation method and mechatronic system6 Aug 2026US 2026/0230016 A1Ojmar, S. A.
- Power generation device for direct current propulsion ship, and control method therefor25 Jun 2026US 2026/0180480 A1Hd Korea Shipbuilding & Offshore Engineering C., Ltd.
- Brushless alternator18 Jun 2026US 2026/0171859 A1Rapid Power Industries
Most cited
By later US patents
- Power control system and method978US 7,635,922 B2C. E. Niehoff & Co. · 2009
- Hybrid alternator213US 5,747,909 AEcoair Corp. · 1998
- Microprocessor based integrated generator set controller apparatus and method202US 5,168,208 AOnan Corporation · 1992
- Controller for permanent magnet generator155US 5,625,276 AColeman Powermate, Inc. · 1997
- Automobile generator apparatus146US 4,973,896 AToyo Densan Company, Ltd. · 1990