Drive assembly for a motorized roller tube system
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United States of America Patent
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app pub date -
Apr 1, 2005
filing date -
Apr 1, 2005
priority date (Note) -
Abandoned
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Abstract
A drive assembly for a motorized roller tube system includes a motor and a gear assembly having multiple gear stages. The motor of the drive assembly is operated inefficiently at a motor speed that is less than 50 percent of a peak efficiency motor speed producing sound pressure levels between approximately 40 dBA and 44 dBA in an ambient of about 38 dBA. Preferably, the efficiency is less than one-half of peak efficiency. The gear assembly includes spur gears and preferably has a gear ratio of 20:1. Preferably, the motor is a DC motor operated at approximately 850 rpm and having an associated torque capability that is at least 4 times the torque capability at the peak efficiency motor speed. The motor may be an AC motor having four or less poles preferably operated at approximately 850 rpm.
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