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Soft-commutated direct current motor

United States Patent

July 27, 1999
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A method and circuit is disclosed for soft-commutation of a direct current (DC) motor. An attenuation circuit is connected through auxiliary brushes A, A', B and B' to the commutator (16) to drain circuit from successive armature coils (15) before the main brushes (27, 28) disconnects from each of the coils (15). This prevents the spark generation that normally occurs in conventional DC motors. The attenuation circuit may also be connected before energization of the coil (15) for a soft turning on operation.
Hsu; John S. (Oak Ridge, TN)
Lockheed Martin Energy Research (Oak Ridge, TN)
09/ 100,628
June 19, 1998
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH This invention was made with Government support under Contract No. DE-AC05-96OR22464 awarded by the U.S. Dept. of Energy. The Government has certain rights in the invention.