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Belt driven Fans - Motor and Fan Speed

Speed of Fan versus Speed of Motor

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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 - Length and Speed of Belt - 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 - A fan motor must be capable of accelerating the fan wheel to operating speed
Fan Troubleshooting - Guide to troubleshooting fan problems
Motors and Pulley Selection - Pulley (Sheave) selection charts for motors ranging 850 - 3450 rpm
Pulleys - Pulleys, blocks and tackles

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