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<< Click to Display Table of Contents >> Drive Efficiency |
  
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<< Click to Display Table of Contents >> Drive Efficiency |
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The Drive Efficiency factor represents the power loses between the motor and conveyor drive pulley inherent in the drive system type.
For a powered conveyor, the motor power required is larger than the power required at the drive pulley (MtrPwr = BeltPwr/efficiency). In a regenerative conveyor, the drive efficiency is treated more like drag (MtrPwr = BeltPwr*efficiency).
The following typical efficiencies represent conservative figure for the various types of drive equipment as they apply to belt conveyor usage. They take into account the uncertainties of field conditions, such as misalignment, maintenance, and temperature changes. There can be variations among different manufacturers' products.
Mechanical Efficiencies of Speed Reduction Mechanism |
|
Type of Speed Reduction |
Efficiency |
V-belts and sheaves |
0.94 |
Roller chain and cut sprockets, open guard |
0.93 |
Roller chain and cut sprockets, oil-tight enclosure |
0.95 |
Single reduction helical or herringbone gear speed reducer or gearmotor |
0.98 |
Double reduction helical or herringbone gear speed reducer or gearmotor |
0.97 |
Triple reduction helical or herringbone gear speed reducer or gearmotor |
0.95 |
Double reduction helical gear, shaft-mounted speed reducer |
0.97 |
Low-Ratio (up to 20:1 range) helical-worm speed reducer |
0.90 |
Medium-Ratio (20:1 to 60:1 range) helical-worm speed reducer |
0.85 |
High-Ratio (60:1 to 100:1 range) helical-worm speed reducer |
0.78 |
Low-Ratio (up to 20:1 range) worm-gear speed reducer |
0.90 |
Medium-Ratio (20:1 to 60:1 range) worm-gear speed reducer |
0.70 |
High-Ratio (60:1 to 100:1 range) worm-gear speed reducer |
0.50 |
Cut gear spurs |
0.90 |
Case gear spurs |
0.85 |
The drive efficiency is input on the Drive Tab.