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Belt driven Fans - Fan vs. Motor Speed

Fan vs. motor speed in belt driven fans.

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Belt driven fans are used in heating, ventilation, air-conditioning and cooling (HVAC) systems.

The speed of a fan wheel versus the speed of the motor with a belt drive can be calculated as

d_f n_f = d_m n_m (1)

where

d_f = pulley diameter fan (inch, mm)

n_f = speed of fan (rpm - rounds per minute)

d_m = pulley diameter motor (inch, mm)

n_m = speed of motor (rpm - rounds per minute)

Example - Speed of Fan

A synchronous electrical motor rotates with speed 1000 rpm. The motor pulley diameter is 76.5 mm and the fan pulley diameter is 205.5 mm. The speed of the fan can be calculated by modifying (1) to

n_f = d_m n_m/ d_f

- or with values:

n_f = (76.5 mm) (1000 rpm) / (205.5 mm)

= 372 rpm

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Related Topics

Ventilation - Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.

Related Documents

Belt Transmissions - Speed and Length of Belts - Calculate length and speed of belt and belt gearing.
Efficiency of Small Machine Elements - Friction and efficiency in bearings and roller chains.
Fan Motors - Starting Torques - The motor must be capable of accelerating the fan wheel to it's operating speed.
Fans - Troubleshooting - Guide to troubleshooting fan problems.
Motors - Speed vs. Pulley Diameter - Pulley (Sheave) selection charts for motors ranging 850 - 3450 rpm.
Pulleys - Pulleys, blocks and tackles.

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