Brush holder for an electric motor
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United States of America Patent
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-
Jul 22, 2014
Grant Date -
Apr 5, 2012
app pub date -
Sep 30, 2011
filing date -
Oct 1, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A brush holder for an electrical motor has an electrically insulating support structure supporting a number of brushes. The support structure has a molded-plastic body incorporating conducting elements forming conductive paths for connecting the brushes to a power supply. A discontinuity is provided in one of the connection paths. A resiliently deformable and electrically conductive strip is connected across the discontinuity with a substantially permanent connection at one end and a heat-meltable connection at the other, with a resilient pre-load tending to break the heat-meltable connection. A voltage drop resistor is provided for operating the motor at a reduced speed. One terminal of the resistor is connected to one side of the discontinuity via a thermally and electrically conducting connection.
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