Inventor
LEGGATE DAVID
US24 patents
⚠️ This page may combine multiple inventors who share the name “LEGGATE DAVID”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
ROCKWELL AUTOMATION TECH INC
12 patentsUS7738267B1Jun 15, 2010
Systems and methods for common-mode voltage reduction in AC drives
ROCKWELL AUTOMATION TECH INC55 citations97
US6541933B1Apr 1, 2003
Angle control of modulating wave to reduce reflected wave overvoltage transients
ROCKWELL AUTOMATION TECH INC59 citations96
US6477067B1Nov 5, 2002
Method and apparatus for compensating for device dynamics in inverter based control systems
ROCKWELL AUTOMATION TECH INC57 citations96
US6469916B1Oct 22, 2002
Method and apparatus for compensating for device dynamics and voltage drop in inverter based control systems
ROCKWELL AUTOMATION TECH INC73 citations96
US7342380B1Mar 11, 2008
System and method for adjustable carrier waveform generator
ROCKWELL AUTOMATION TECH INC25 citations92
US6819070B2Nov 16, 2004
Method and apparatus for controlling reflected voltage using a motor controller
ROCKWELL AUTOMATION TECH INC47 citations92
US7881081B1Feb 1, 2011
Systems and methods for reducing AC drive common-mode currents
ROCKWELL AUTOMATION TECH INC29 citations91
US6617821B2Sep 9, 2003
Method and apparatus for compensating for device dynamics by adjusting inverter carrier frequency
ROCKWELL AUTOMATION TECH INC33 citations91
US7626836B2Dec 1, 2009
Method and apparatus for adjustable voltage/adjustable frequency inverter control
ROCKWELL AUTOMATION TECH INC25 citations90
US10250161B1Apr 2, 2019
Adaptive harmonic elimination compensation for voltage distortion elements
ROCKWELL AUTOMATION TECH INC6 citations73
US9584043B2Feb 28, 2017
Inverter phase current reconstruction apparatus and methods
ROCKWELL AUTOMATION TECH INC5 citations73
US10527661B2Jan 7, 2020
Calculating a load resistance
ROCKWELL AUTOMATION TECH INC0 citations52
ALLEN BRADLEY CO
8 patentsUS5912813AJun 15, 1999
Method and apparatus for controlling reflected voltage using a motor controller
ALLEN BRADLEY CO61 citations95
US6014497AJan 11, 2000
Method and apparatus for determining a critical dwell time for use in motor controls
ALLEN BRADLEY CO36 citations92
US5990658ANov 23, 1999
Apparatus for controlling reflected voltage on motor supply lines
ALLEN BRADLEY CO26 citations92
US5917721AJun 29, 1999
Apparatus for reducing the effects of turn on delay errors in motor control
ALLEN BRADLEY CO48 citations92
US5671130ASep 23, 1997
Method and apparatus for controlling voltage reflections using a motor controller
ALLEN BRADLEY CO36 citations92
US5625550AApr 29, 1997
Apparatus used with AC motors for compensating for turn on delay errors
ALLEN BRADLEY CO23 citations92
US5329217AJul 12, 1994
Compensated feedforward voltage for a PWM AC motor drive
ALLEN BRADLEY CO49 citations92
US5121043AJun 9, 1992
PWM control in the pulse dropping region
ALLEN BRADLEY CO26 citations92
TALLAM RANGARAJAN M
2 patentsUS8503207B2Aug 6, 2013
Discontinuous pulse width drive modulation method and apparatus for reduction of common-mode voltage in power conversion systems
TALLAM RANGARAJAN M14 citations83
US8488345B2Jul 16, 2013
Pulse width modulation control method and system for mitigating reflected wave effects in over-modulation region
TALLAM RANGARAJAN M8 citations83