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Electronically commutated serial-parallel switching for motor windings

United States Patent

March 27, 2012
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A method and a circuit for controlling an ac machine comprises controlling a full bridge network of commutation switches which are connected between a multiphase voltage source and the phase windings to switch the phase windings between a parallel connection and a series connection while providing commutation discharge paths for electrical current resulting from inductance in the phase windings. This provides extra torque for starting a vehicle from lower battery current.
Hsu; John S. (Oak Ridge, TN)
UT-Battelle, LLC (Oak Ridge, TN)
12/ 009,732
January 22, 2008
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH This invention was made with United States Government support under Contract No. DE-AC05-00OR22725 between the United States Department of Energy and UT-Battelle, LLC. The United States Government has certain rights in this invention.