Limiting peak electrical power drawn by mining excavators
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United States of America Patent
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May 8, 2012
Grant Date -
Nov 18, 2010
app pub date -
May 15, 2009
filing date -
May 15, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
The maximum electrical power drawn from an electrical power source by a mining excavator comprising electric motors is reduced by supplying supplementary electrical power from an electrical energy storage unit. The input electrical power drawn by the mining excavator is cyclic. An upper limit is set for the electrical power drawn from the electrical power source. When the input electrical power drawn by the mining excavator exceeds the upper limit, electrical power is supplied by the electrical energy storage unit, such as an ultracapacitor bank. The ultracapacitor bank may be charged by the electrical power source during off-peak intervals. Electrical power generated by electrical motors operating in a regeneration interval may also be recaptured and stored in the electrical energy storage unit.
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