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Combined Electric Machine and Current Source Inverter Drive System

Oak Ridge National Laboratory

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Publications:

PDF Document Publication11-G00249_ID2505.pdf (764 KB)


Technology Marketing SummaryThis technology is a drive system that includes a permanent magnet-less (PM-L) electric motor combined with a current source inverter (CSI). This integration of these two ORNL technologies opens a new chapter for component function integration, instead of traditional integration by simply placing separate motor and inverter components in the same housing.Description

A permanent magnet (PM) is a major cost item in an interior PM machine. The cost of other PM machines such as PM wind power generators and megawatt PM motors depend on the supply of rare earth elements for production of PMs. Voltage source inverters need bulky, expensive, and temperature-limited DC bus capacitors. As operational temperatures increase, the ability of film capacitors to handle ripple currents decreases, necessitating the addition of even more capacitance. The current source inverter by itself can eliminate a large portion of the capacitors, but it requires additional inductors. This technology’s integration reduces the dependency on rare earth elements and the need for additional inductors. In addition, elimination of several components reduces drive system cost, weight, and volume.

Benefits
  • Reduced system cost, weight, and volume
  • Reduces use of rare earth elements
  • Component function integration
Applications and Industries
  • Electric motors, including electric and hybrid vehicles
  • Wind power generators
  • Industrial power generators
More InformationJohn S. Hsu. Combined Electric Machine and Current Source Invertor Drive System, U.S. Provisional Patent Application 61/417,906, filed November 30, 2010.Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Date
Patent 8,760,105
Patent
8,760,105
Electric machine and current source inverter drive system
A drive system includes an electric machine and a current source inverter (CSI). This integration of an electric machine and an inverter uses the machine's field excitation coil for not only flux generation in the machine but also for the CSI inductor. This integration of the two technologies, namely the U machine motor and the CSI, opens a new chapter for the component function integration instead of the traditional integration by simply placing separate machine and inverter components in the same housing. Elimination of the CSI inductor adds to the CSI volumetric reduction of capacitors and the elimination of PMs for the motor further improve the drive system cost, weight, and volume.
Oak Ridge National Laboratory 06/24/2014
Issued
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
UT-B ID 201002505PrototypeAvailable11/21/201110/27/2011

Contact ORNL About This Technology

To: David L. Sims<simsdl@ornl.gov>