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Motor torque in lb-in
motor image credit: Wikipedia.com
Solve the required motor torque in lb-in generated by the specified motor 5 hp rating and speed of 1800 rpm.
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Torque (lb-in)
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HP x 63024
RPM
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Memory recall lesson learned :
RPM = revolution per minute ; 1 hp = 33,000 lb-ft per minute ; 1 revolution = 2π
2π = 6.2832 ; 33,000 /6.2832 = 5252 ; 33,000 lb-ft per minute = 396,000 lb-in per min ; 396,000/6.2832 = 63024 ; FPM = feet per min ; FPM = 0.262 RPM * Diameter in inches
