Inventor · disambiguated record
Ronald J. Krefta
Also filed as: KREFTA RONALD J · KREFTA RONALD JOHN
18 granted patents·5 pending applications·526 citations·filing 1988–2023
95Inventor score
Top patents by PatentIndex Score
23 records- 0196US4933584AElectronically commutated motor having skewed magneticsGEN ELECTRIC·Filed 1988·Granted Jun 12, 1990·121 cites·50 claims
- 0293US6741060B2Method and system for controlling a permanent magnet machine during fault conditionsDELPHI TECH INC·Filed 2001·Granted May 25, 2004·61 cites·18 claims
- 0393US6577097B2Method and system for controlling a synchronous machine using a changeable cycle-conduction angleDELPHI TECH INC·Filed 2001·Granted Jun 10, 2003·58 cites·17 claims
- 0489US9260036B2System and method for error correction in angular position sensorsALLISON TRANSM INC·Filed 2015·Granted Feb 16, 2016·8 cites·27 claims
- 0585US7945374B2Method and apparatus for characterizing fuel injector performance to reduce variability in fuel injectionDELPHI TECH INC·Filed 2008·Granted May 17, 2011·14 cites·11 claims
- 0685US6232739B1High-resolution incremental position sensor with pulse switching strategyDELPHI TECH INC·Filed 2000·Granted May 15, 2001·29 cites·13 claims
- 0784US6538358B1Hybrid electrical machine with axially extending magnetsDELPHI TECH INC·Filed 2000·Granted Mar 25, 2003·32 cites·27 claims
- 0883US6864667B2Stator winding pattern for reduced magnetic noiseDELPHI TECH INC·Filed 2001·Granted Mar 8, 2005·30 cites·17 claims
- 0982US6455978B1Hybrid twin coil electrical machineDELPHI TECH INC·Filed 2000·Granted Sep 24, 2002·27 cites·17 claims
- 1082US6437477B1Hybrid electrical machine with axial flux magnetDELPHI TECH INC·Filed 2000·Granted Aug 20, 2002·29 cites·27 claims
- 1182US5821722AMultiphase electrical motor, control and method using overlapping conduction periods in the windingsGEN ELECTRIC·Filed 1995·Granted Oct 13, 1998·56 cites·4 claims
- 1279US6639371B2Method and system for controlling start of a permanent magnet machineDELPHI TECH INC·Filed 2001·Granted Oct 28, 2003·26 cites·16 claims
- 1374US12459376B2Optimization of switching frequency and pulse width modulation technique for traction power invertersBORGWARNER INC·Filed 2023·Granted Nov 4, 2025·0 cites·16 claims
- 1469US11423203B2System and method for modeling thermal circuitsDELPHI TECH IP LTD·Filed 2019·Granted Aug 23, 2022·1 cites·17 claims
- 1564US4950960AElectronically commutated motor having an increased flat top width in its back EMF waveform, a rotatable assembly therefor, and methods of their operationGEN ELECTRIC·Filed 1989·Granted Aug 21, 1990·24 cites·39 claims
- 1661US8656890B2System and method for controlling an injection time of a fuel injector based on closing electrical decayFARAH PHILIPPE S·Filed 2011·Granted Feb 25, 2014·2 cites·11 claims
- 1754US6342772B1Drive circuit and method for driving a switched reluctance machineDELPHI TECH INC·Filed 2001·Granted Jan 29, 2002·8 cites·21 claims
- 1852US9463713B2System and method for error correction in angular position sensorsALLISON TRANSM INC·Filed 2016·Granted Oct 11, 2016·0 cites·31 claims
- 1943US2014350871A1Method to estimate power dissipation of an inverterDELPHI TECH INC·Filed 2013·Application pending·0 cites
- 2037US2004012354A1Hybrid electrical machine with system and method for controlling such hybrid machineFiled 2003·Application pending·0 cites
- 2136US2003193260A1Composite power metal stator sleeveFiled 2002·Application pending·0 cites
- 2234US2016276969A1Electric motor driver with current sensor error correctionDELPHI TECH INC·Filed 2015·Application pending·0 cites
- 2334US2003057789A1Five phase alternating current generatorFiled 2001·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →