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Electrical Motor Drive Apparatus and Method

Oak Ridge National Laboratory

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Technology Marketing SummaryThis invention discloses an electrical motor drive topology that can significantly reduce the inverter dc bus ripple currents and thus the requirement of the dc bus capacitance. It enables the inverter to cost-effectively operate in elevated temperature environments such as the engine compartment in a hybrid electric vehicle.DescriptionThe drive topology is based on a segmented drive system that does not add switches or passive components but involves reconfiguring inverter switches and motor winding connections in a way that enables the formation of independent drive units and the use of simple interleaved switching and optimized pulse width modulation (PWM) schemes that significantly reduce the capacitor ripple current.Benefits
  • Substantially reduces the bus capacitance and thus inverter volume and cost
  • Reduce battery losses and improves battery operating conditions by eliminating battery ripple current
  • Significantly reduces the motor torque ripples and reduces switching losses
  • Increases inverter reliability
  • Enables inverters for high temperature operation thereby eliminating the need for liquid cooling
Applications and Industries
  • Automotive propulsion
  • Industrial drives
  • Auto manufacturers
  • Industrial motor drive manufacturers
Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Date
Patent 8,373,372
Patent
8,373,372
Electrical motor/generator drive apparatus and method
The present disclosure includes electrical motor/generator drive systems and methods that significantly reduce inverter direct-current (DC) bus ripple currents and thus the volume and cost of a capacitor. The drive methodology is based on a segmented drive system that does not add switches or passive components but involves reconfiguring inverter switches and motor stator winding connections in a way that allows the formation of multiple, independent drive units and the use of simple alternated switching and optimized Pulse Width Modulation (PWM) schemes to eliminate or significantly reduce the capacitor ripple current.
Oak Ridge National Laboratory 02/12/2013
Issued
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
ORNL ID#2230Development - patent pendingAvailable01/22/201002/02/2010

Contact ORNL About This Technology

To: David Sims<simsdl@ornl.gov>