Because they do not require electricity to create a magnetic field they use 3 to 5 times less electricity than your typical ceiling fan that has an ac motor.
Dc motor cooling fans.
Cross flow fans for wide uniform airflow.
Fan motors that use up to 75 less electricity.
Axial fans for ventilation and cooling.
Fans with brushless dc motors have their own built in permanent magnets made of rare metals.
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This potential decrease in airflow must be considered in the system cooling design.
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Centrifugal fans blowers for cooling drying and high static pressure.
Current draw by a dc fan motor.
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About dc motor ceiling fans.
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Oriental motor offers a wide range of cooling fan products centered on thermal management to meet these requirements.
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What may not be understood is the current draw from this fan is not a dc current.
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And a few notable dc motor fan manufacturers.
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When examining the label on a dc brushless fan or examining a datasheet the value for the current draw will be given as an average current.