Current control via speed control for driving screw compressor under cold conditions
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United States of America Patent
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Sep 29, 2015
Grant Date -
Dec 13, 2012
app pub date -
Jun 21, 2011
filing date -
Jun 8, 2011
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Abstract
When starting a screw-type air compressor in sub-zero conditions, current spikes are mitigated by detecting an over-current condition and/or a below-threshold temperature, and a warm-up routine is initiated in which compressor motor speed is ramped in a sawtooth fashion between two speeds that are substantially lower than a nominal operating speed of the compressor motor. In this manner, the internal components of the compressor are warmed prior to fully starting the compressor, which mitigates current spikes, reduces blown fuses, and extends the life of the compressor motor and other compressor components.
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