Switching circuit for high current brushes in a dynamoelectric machine
AssigneeWestinghouse Electric Corp.
InventorsGeorge T. Hummert, Randall M. Garrett, Roy D. Schultz
Life of this patent
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Abstract
A switching circuit electrically connected to a brush and collector bar of a DC dynamoelectric machine utilizing a high current rectifier and a source of electromotive source which produces a current in the circuit which is generally equal to the current flowing between the brush and the collector bar and which can be forced to zero as the brush separates from the collector bar to reduce degradation of the trailing edges of the brushes and collector bars and improve the machine efficiency.
Claims4
A switching circuit in a DC dynamoelectric machine having a stator and a rotor, conductors in said rotor electrically connected to collector bars, and brushes which intermittently make electrical and physical contact with said collector bars, said switching circuit comprising a first collector bar disposed in the rotor;
- a first brush disposed to contact said first collector bar;
- a first auxiliary brush disposed to contact said first collector bar before said first brush separates therefrom;
- rectifying means electrically connected in a series circuit with said first brush and said first auxiliary brush;
- and a source of electromotive force which produces a current in said series circuit which is generally equal to the current flowing between said first collector bar and said first brush and which generally forces said current between said first collector bar and said first brush to zero as said first brush separates from said first collector bar.
Dependencies are inferred from the claim text.