H02P 1/52
By progressive increase of frequency of supply to motor
Official title: by progressive increase of frequency of supply to motor
H02P1/52 (By progressive increase of frequency of supply to motor) appears on 72 US grants and 68 published applications in this corpus.
Search patents in H02P- Granted patents
- 72
- Published applications
- 68
- Assignees
- 57
- Inventors
- 174
- Latest grant
- 14 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 2 | 2 |
| 2007 | 0 | 1 |
| 2008 | 2 | 0 |
| 2009 | 1 | 0 |
| 2010 | 0 | 2 |
| 2011 | 1 | 4 |
| 2012 | 3 | 3 |
| 2013 | 1 | 8 |
| 2014 | 3 | 1 |
| 2015 | 4 | 11 |
| 2016 | 8 | 10 |
| 2017 | 7 | 2 |
| 2018 | 4 | 1 |
| 2019 | 2 | 5 |
| 2020 | 3 | 3 |
| 2021 | 5 | 4 |
| 2022 | 6 | 0 |
| 2023 | 2 | 4 |
| 2024 | 1 | 1 |
| 2025 | 2 | 3 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Methods and systems for synchronizing synchronous motors with electric grid based on detected shaft position14 Apr 2026US 12,603,590 B2Nuovo Pignone Tecnologie Srl
- Electrically driven distributed propulsion system11 Mar 2025US 12,249,831 B2General Electric Company
- System and method for ground fault detection of static starter circuitry7 Jan 2025US 12,188,992 B2GE Infrastructure Technology LLC
- System and method for cooling power electronics of refrigerant compressors30 Jul 2024US 12,050,036 B2Danfoss A/S
- Methods of protecting motors driven by variable frequency drives and variable frequency drive systems employing the same7 Nov 2023US 11,811,345 B1Eaton Intelligent Power Limited
- Independent transistor gate sequencing for precision zero-cross shutoff11 Jun 2026US 2026/0163502 A1Rockwell Automation Technologies, Inc.
- Motor driver having start-up duty cycle modulation mechanism2 Oct 2025US 2025/0309793 A1Anpec Electronics Corporation
- Electrically driven distributed propulsion system19 Jun 2025US 2025/0202230 A1General Electric Company
- Thyristor starter6 Feb 2025US 2025/0047222 A1TMEIC Corporation
- Methods and systems for synchronizing synchronous motors with electric grid based on detected shaft position4 Jan 2024US 2024/0007032 A1Nuovo Pignone Tecnologie Srl
Most cited
By later US patents
- Marine propulsion system36US 4,338,525 AWestinghouse Electric Corp. · 1982
- Method of controlling operation of synchronous motor and motor control apparatus for the same30US 5,969,496 AToyota Jidosha Kabushiki Kaisha · 1999
- Transitioning between multiple modes of inverter control in a load commutated inverter motor drive27US 4,443,747 AGeneral Electric Company · 1984
- Redundant electrical brake and protection system for electric generators26US 7,586,216 B2General Electric Company · 2009
- Starting system for chopper controlled motor-commutated thyristor inverter25US 4,488,101 ABorg-Warner Corporation · 1984