15
Speed Reduction
Speed Reduction
The rotary motion created by most motors occurs at speeds too high to be applied directly to moving scenery. The speed of a motor’s shaft must be reduced to usable levels, generally by a gearbox, although V-belts and toothed belts are also occasionally used. Regardless of how speed is reduced:
Pin × Efficiency = Pout
Tin ωin × Efficiency = Tout ωout
| Where | Pin, Pout | = | power put into, and power received out of the speed reducer (ft-lb/sec, watts) |
| Efficiency | = | the decimal value of the percentage of power passed through the speed reducer (if reducer is 72% efficient, use 0.72) | |
| Tin, Tout | = | torque at input shaft, and torque at output shaft (ft-lb, Nm) | |
| ωin, ωout | = | angular speed at input shaft, and output ... |
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