Belt driven Fans - Length and Speed of Belt

Length and speed of belt, belt gearing

Belt driven fans are common in heating, ventilation and cooling systems.

Belt Length

The length of the belt can be calculated as

l_b = ((d_f + d_m) 1.5708 ) + (2 l_fm) (1)

where

l_b = length of belt (mm, inches)

d_f = pulley diameter fan (mm, inches)

d_m = pulley diameter motor (mm, inches)

l_fm = center to center distance of fan and motor pulleys (mm, inches)

d_f  - pulley diameter fan (mm, inches)

d_m - pulley diameter motor (mm, inches)

l_fm - center to center distance of fan and motor pulleys (mm, inches)

Belt Velocity

The velocity at which a belt travels may be expressed as

v = π d_m n_m / 12 (2)

where

v = velocity of belt (ft/min)

n_m = velocity motor (rpm)

Belt Gearing

The relationship between the speed of the motor, the fan and their disc diameters can be expressed as

d_f  n_f = d_m n_m (3)

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