H02P 27/18
Varying the frequency by omitting half waves
Official title: varying the frequency by omitting half waves
H02P27/18 (Varying the frequency by omitting half waves) appears on 19 US grants and 17 published applications in this corpus.
Search patents in H02P- Granted patents
- 19
- Published applications
- 17
- Assignees
- 18
- Inventors
- 38
- Latest grant
- 5 May 2020
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 2 |
| 2002 | 1 | 0 |
| 2003 | 0 | 1 |
| 2004 | 1 | 0 |
| 2005 | 1 | 1 |
| 2006 | 1 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 1 | 0 |
| 2013 | 1 | 2 |
| 2014 | 2 | 1 |
| 2015 | 1 | 1 |
| 2016 | 2 | 2 |
| 2017 | 1 | 1 |
| 2018 | 2 | 2 |
| 2019 | 0 | 0 |
| 2020 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Method and device for operating an electric motor5 May 2020US 10,644,620 B2Woehner GmbH & Co. KG Elektrotechnische Systeme
- Speed control of variable-speed multiple-phase motors25 Sep 2018US 10,084,406 B2Emerson Electric Co.
- Divided phase AC synchronous motor controller17 Apr 2018US 9,948,227 B2QM Power, Inc.
- Divided phase AC synchronous motor controller18 Jul 2017US 9,712,099 B2QM Power, Inc.
- Power frequency converter and associated method1 Nov 2016US 9,484,828 B2The Boeing Company
- Method and Device for Operating an Electric Motor27 Dec 2018US 2018/0375446 A1Woehner GmbH & Co. KG Elektrotechnische Systeme
- 2-phase brushless ac motor with embedded electronic control2 Aug 2018US 2018/0219500 A1
- Divided phase ac synchronous motor controller2 Nov 2017US 2017/0317634 A1QM Power, Inc.
- Speed Control of Variable-Speed Multiple-Phase Motors7 Apr 2016US 2016/0099671 A1Emerson Electric Co.
- Divided Phase AC Synchronous Motor Controller11 Feb 2016US 2016/0043682 A1QM Power, Inc.
Most cited
By later US patents
- System for controlling the rotation of AC motors37US 6,208,113 B1ebm Werke GmbH & Co. · 2001
- Asynchronous motor speed control method and device19US 5,334,922 AFAAC Incorporated · 1994
- Barrier movement operator speed control18US 7,042,183 B2The Chamberlain Group, Inc. · 2006
- Variable speed AC drive control14US 5,402,054 ABoral Johns Perry Industries Pty. Ltd. · 1995
- Soft starting method and system thereof in the way of wave-skipping with stepped frequency and stepless voltage regulating for a motor9US 8,179,082 B2Rongxin Power Electronics Co., Ltd · 2012