H02P 27/047
V/f converter, wherein the voltage is controlled proportionally with the frequency
Official title: {V/F converter, wherein the voltage is controlled proportionally with the frequency}
H02P27/047 (V/f converter, wherein the voltage is controlled proportionally with the frequency) appears on 221 US grants and 148 published applications in this corpus.
Search patents in H02P- Granted patents
- 221
- Published applications
- 148
- Assignees
- 134
- Inventors
- 461
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 7 | 0 |
| 1978 | 9 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 6 | 0 |
| 1982 | 7 | 0 |
| 1983 | 5 | 0 |
| 1984 | 9 | 0 |
| 1985 | 4 | 0 |
| 1986 | 2 | 0 |
| 1987 | 4 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 4 | 0 |
| 1996 | 0 | 0 |
| 1997 | 4 | 0 |
| 1998 | 2 | 0 |
| 1999 | 4 | 0 |
| 2000 | 3 | 0 |
| 2001 | 0 | 1 |
| 2002 | 3 | 5 |
| 2003 | 3 | 3 |
| 2004 | 5 | 1 |
| 2005 | 2 | 4 |
| 2006 | 0 | 0 |
| 2007 | 2 | 1 |
| 2008 | 1 | 1 |
| 2009 | 1 | 3 |
| 2010 | 0 | 3 |
| 2011 | 4 | 4 |
| 2012 | 3 | 3 |
| 2013 | 2 | 4 |
| 2014 | 2 | 6 |
| 2015 | 7 | 17 |
| 2016 | 10 | 13 |
| 2017 | 12 | 7 |
| 2018 | 8 | 9 |
| 2019 | 9 | 15 |
| 2020 | 10 | 10 |
| 2021 | 5 | 7 |
| 2022 | 13 | 10 |
| 2023 | 10 | 8 |
| 2024 | 5 | 6 |
| 2025 | 8 | 4 |
| 2026 | 3 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Variable frequency drive synchronous reluctance motor system with volts-per-Hertz control21 Oct 2025US 12,451,829 B2Nidec Motor Corporation
- Method for Operating a Frequency Converter and Frequency Converter28 May 2026US 2026/0149355 A1Lenze Swiss AG
- Method for controlling induction motor, device, equipment, and storage medium5 Mar 2026US 2026/0066816 A1Fortior Technology (Shanghai) Co., Ltd.
- Method to identify rotor slot harmonics in a motor current spectrum19 Feb 2026US 2026/0051834 A1Eaton Intelligent Power Limited
- Motor power optimization for downhole motors11 Dec 2025US 2025/0376979 A1Schlumberger Technology Corporation
- System and Method for Controlling Hybrid and Grid Power in an Electric Fracturing Spread2 Oct 2025US 2025/0309809 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Hydraulic fracturing equipment with non-hydraulic power249US 10,280,724 B2U.S. Well Services, LLC · 2019
- Hand held variable speed drill motor and control system therefor220US 4,052,649 ALear Motors Corporation · 1977
- Means for stabilizing an a-c electric motor drive system108US 4,088,934 AGeneral Electric Company · 1978
- Frequency converter for different mains voltages105US 7,221,121 B2Danfoss Drives A/S · 2007
- Transistor bridge inverter motor drive having reduced harmonics89US 3,967,173 AAllis-Chalmers Corporation · 1976