H02P 27/04
Arrangements or methods for the control of ac motors characterised by the
Official title: using variable-frequency supply voltage, e.g. inverter or converter supply voltage
H02P27/04 (Arrangements or methods for the control of ac motors characterised by the) appears on 6,531 US grants and 7,307 published applications in this corpus.
Search patents in H02P- Granted patents
- 6,531
- Published applications
- 7,307
- Assignees
- 1,461
- Inventors
- 10,782
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 12 | 0 |
| 1977 | 10 | 0 |
| 1978 | 16 | 0 |
| 1979 | 6 | 0 |
| 1980 | 9 | 0 |
| 1981 | 23 | 0 |
| 1982 | 19 | 0 |
| 1983 | 14 | 0 |
| 1984 | 30 | 0 |
| 1985 | 11 | 0 |
| 1986 | 20 | 0 |
| 1987 | 15 | 0 |
| 1988 | 14 | 0 |
| 1989 | 14 | 0 |
| 1990 | 9 | 0 |
| 1991 | 18 | 0 |
| 1992 | 10 | 0 |
| 1993 | 13 | 0 |
| 1994 | 11 | 0 |
| 1995 | 14 | 0 |
| 1996 | 7 | 0 |
| 1997 | 11 | 0 |
| 1998 | 17 | 0 |
| 1999 | 29 | 0 |
| 2000 | 20 | 0 |
| 2001 | 21 | 10 |
| 2002 | 23 | 22 |
| 2003 | 23 | 25 |
| 2004 | 19 | 28 |
| 2005 | 17 | 49 |
| 2006 | 50 | 46 |
| 2007 | 36 | 61 |
| 2008 | 41 | 66 |
| 2009 | 29 | 84 |
| 2010 | 57 | 110 |
| 2011 | 80 | 121 |
| 2012 | 97 | 127 |
| 2013 | 112 | 197 |
| 2014 | 145 | 217 |
| 2015 | 208 | 267 |
| 2016 | 208 | 373 |
| 2017 | 393 | 619 |
| 2018 | 472 | 552 |
| 2019 | 578 | 632 |
| 2020 | 578 | 643 |
| 2021 | 546 | 560 |
| 2022 | 601 | 619 |
| 2023 | 489 | 561 |
| 2024 | 512 | 623 |
| 2025 | 551 | 427 |
| 2026 | 273 | 268 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H02P 27/06Using dc to ac converters or inverters5,929
- H02P 27/047V/f converter, wherein the voltage is controlled proportionally with the frequency221
- H02P 27/16Using ac to ac converters without intermediate conversion to dc162
- H02P 27/045Whereby the speed is regulated by measuring the motor speed and comparing77
- H02P 27/048Using ac supply for only the rotor circuit or only the stator37
- H02P 27/05Using ac supply for both the rotor and the stator circuits, the35
Recent patents
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- Load driving device6 Oct 2026US 12,756,347 B2Denso Corporation
- Power battery charging method, motor control circuit, and vehicle29 Sep 2026US 12,749,912 B2BYD Company Limited
- Managing regenerative energy of reciprocating pumping unit8 Oct 2026US 2026/0309009 A1Weatherford Technology Holdings, LLC
- Rotary electric machine control device, electric power steering device, and vehicle8 Oct 2026US 2026/0312519 A1Mitsubishi Electric Mobility Corporation
- Control factor based matrix converter control in a motor drive unit8 Oct 2026US 2026/0312525 A1Vidar Corporation
- Fryer filter pump protection with multi-speed filtration and top off1 Oct 2026US 2026/0294169 A1The Frymaster Corporation
- Power integration circuit with motor drive and battery charging and discharging function1 Oct 2026US 2026/0296234 A1Delta Electronics, Inc.
Most cited
By later US patents
- Method and apparatus for quiet variable motor speed control1,483US 7,330,004 B2Lutron Electronics Co., Inc. · 2008
- HVAC actuator with automatic end stop recalibration963US 9,641,122 B2Johnson Controls Technology Company · 2017
- Apparatus for controlling electric motor861US 4,788,485 AMitsubishi Denki Kabushiki Kaisha · 1988
- System and method for powering a hydraulic pump357US 8,997,904 B2General Electric Company · 2015
- Method and device for controlling photovoltaic inverter, and feed water device267US 7,126,294 B2Ebara Corporation · 2006