lfm = center to center distance of fan and motor pulleys (mm, inches)
The velocity at which a belt travels may be expressed as
v = π dm nm / 12 (2)
v = velocity of belt (ft/min)
nm = revolutions motor (rpm)
- or alternatively in metric units:
vb = π dm nm / 60 (2b)
vb = velocity of belt (m/s)
dmb = diameter motor pulley (m)
|Pitch Diameter of Pulley |
|Velocity (ft/min) |
|Revolutions Pulley - n -(rpm)|
The relationship between the rotational speed of the motor and the fan and the disc diameter can be expressed as
df nf = dm nm (3)
nf = nm dm / df
If belt tension and belt velocity are known - horsepower transferred can be calculated as
Php = Fb vb / 33000 (4)
Php = power (hp)
Fb = belt tension (lbf)
vb = velocity of belt (ft/min)
If torque and revolution per minute are known - horsepower transferred can be calculated as
Php = T n / 5252 (4)
Php = power (hp)
T = torque (ft lbf)
n = revolutions per minute (rpm)
Speed ratio can be calculated as
SR = nf / ns (5)
SR = speed ratio
nf = revolutions per minute - fastest machine
ns = revolutions per minute - slowest machine
Forces, acceleration, displacement, vectors, motion, momentum, energy of objects and more.
Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.
Fan vs. motor speed in belt driven fans.
Calculate belts power transmission and efficiency
The pulley laws - driver and driven - diameter and rpm
The connecting rod mechanism.
Maximum conveyor belt speed.
Calculate conveyor capacities.
Conveyor required power consumption vs. load.
Maximum conveyor inclination slopes for typical products.
Friction and efficiency in bearings and roller chains.
Service factor - SF - is a measure of periodically overload capacity at which a motor can operate without beeing damaged.
The affinity laws can be used to calculate resulting volume capacity, head or power consumption when speed or wheel diameters are changed.
The kinetic energy stored in flywheels - the moment of inertia.
Output torque, speed and horsepower with gears.
Gear train transmissions - bicycle gearing.
Gears effort force vs. load force.
Pulley (Sheave) selection charts for motors ranging 850 - 3450 rpm.
Pulleys, blocks and tackles.
The work done and power transmitted by a constant torque.
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