Belt Driven Vs Direct Drive Fans

Belt driven fans offer greater flexibility in terms of rpm speed.

Belt driven vs direct drive fans.

May 3 2019 fanmann33 8 comments. There are some advantages and dis advantages direct drive and belt drive exhaust fans and supply fans have over each other. Where on a belt drive fan the fan motor shaft has a pulley connected by a belt to a second pulley. More friction between moving parts which can lead to more maintenance and higher energy costs.

Belt drive fans have two additional bearings. In addition belt driven fans are less efficient than a direct driven fan of equivalent size due to transmission losses. Direct drive fans require fewer parts and thus usually less maintenance. Direct drive fans www airdistributor net official blog.

On both direct drive and belt drive fans the motor has two bearings. When compared to belt drive fans which require belts sheaves and bushings direct drive is just plain simpler and maintenance folks tend to lean toward direct drive for daily maintenance. Either of these motor mount options can typically be found in wall mount exhaust and supply fans roof mount exhaust and supply fans inline duct fans and air circulation products. As energy costs increase it has become desirable to transition to a more efficient means of driving fan systems.

You have a fan a motor and maybe a coupling. However a belt drive fan has power transmission loss due to the friction between the belt and sheaves and due to the drive shaft bearings. This is because of the fact that the amount of friction is greatly reduced in case of this fan when the fan is operating. The second pulley is connected to a shaft that drives the fan propeller.

Direct driven fans mount the motor to the fan shaft in order to directly transmit energy. Generally such fans are cheaper than direct drive fans of comparable size. Unlike the belt driven fans in case of a direct drive fan there is lesser energy loss. More often than not the maintenance cost of this kind of fan is also comparatively lower.

Since there is at least a 3 percent drive loss for a belt drive fan and no v belt drive loss for a direct drive fan the direct drive fan by default will be more efficient. Direct drive fans should be designed for acceptable bearing life. 7 8 etc the flexible drive coupling loss is immeasurable and ignored so its drive efficiency follows that of an arr. The two bearings on direct drive fan motors which are 7 horsepower and larger are typically regreaseable.

Direct drive fans have no power transmission loss since the propeller is directly connected to the motor shaft.