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De-Rated Drum Motors


Cool Running Drum Motors

Overview of De-rated (cool-running) Drum Motors using a Frequency Converter

80i - derated 113i - derated 138i - derated 165i - derated 216i - derated
Diameter 3.21″ 4.47″ 5.43″ 6.46″ 8.56″
Gear material Steel Steel Steel Steel Steel
Rated power 0.02 to 0.13 Hp 0.08 to 0.4 Hp 0.2 to 1.09 Hp 0.4 to 2.39 Hp 0.4 to 2.39 Hp
Rated torque 21.24 to 200.91 in-lbf 66.38 to 652.30 in-lbf 128.34 to 1279.82 in-lbf 246.94 to 2656 in-lbf 246.94 to 2644.60 in-lbf
Belt pull* 13.49 to 125.90 lbs 30.14 to 295.85 lbs 48.11 to 478.17 lbs 77.33 to 833.15 lbs 58.23 to 623.40 lbs
Velocity of the shell* 19.69 to 188.98 fpm 9.84 to 297.24 fpm 7.87 to 387.80 fpm 15.75 to 494.09 fpm 21.65 to 657.48 fpm
Shell length SL 7.60 to 37.13″ 9.84 to 47.24″ 15.75 to 62.99″ 400 to 1,600 mm 15.75 to 62.99″
Positive drive beltyesyesyesyesyes
Without beltyesyesyesyesyes
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Derated drum motors are used to prevent thermal overload. This can be achieved by using a standard drum motor with frequency converter.
The following pages show the derated values of standard drum motors when the derating is made by a frequency converter.
*Note: Values given for cylindrical shell.
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