Torque Drum
Torque Drum
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How much torque....?
If you want to lift an elevator that weights 1000 lbs. and the hoist drum is 24" inches diameter. How much torque does the motor have to produce? How much Horse power required at 100 RPM, How much Horse power required at 400 RPM
Torque = force x distance
where distance is the radius of the drum.
a force of 1000 lbs just balances the weight of the elevator and so doesn't let it fall but doesn't cause it to rise. So you have to decide how much additional force is needed.
Horsepower is energy/time so you can use conservation of energy.
At W RPM, the total distance is (2)(pi)(radius)/minute. Energy is force times distance. In theory, you should also add in the kinetic energy, but that, like getting the elevator to move in the first place, is a transient, rather than a steady state horsepower requirement (assuming no air friction, etc.)
one horsepower is 33,000 ft·lbf/min
This page has some of the conversion factors:
http://en.wikipedia.org/wiki/Horse_power
Tags: drumming, drums, flywheel, setup, torque drum and bass, torque drum key, torque drum tuner, torque drum tuning, torque drums, tuning