Belt Driven Vs Direct Drive Fans

This is because of the fact that the amount of friction is greatly reduced in case of this fan when the fan is operating.

Belt driven vs direct drive fans.

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. Direct drive fans have no power transmission loss since the propeller is directly connected to the motor shaft. On both direct drive and belt drive fans the motor has two bearings. Belt drive fans have two additional bearings.

Generally such fans are cheaper than direct drive fans of comparable size. Direct drive fans www airdistributor net official blog. Note that for shaft driven direct drive fans arr. Direct drive fans require fewer parts and thus usually less maintenance.

More often than not the maintenance cost of this kind of fan is also comparatively lower. Where on a belt drive fan the fan motor shaft has a pulley connected by a belt to a second pulley. Belt driven fans offer greater flexibility in terms of rpm speed. Direct driven fans mount the motor to the fan shaft in order to directly transmit energy.

As energy costs increase it has become desirable to transition to a more efficient means of driving fan systems. 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. 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. The two bearings on direct drive fan motors which are 7 horsepower and larger are typically regreaseable.

More friction between moving parts which can lead to more maintenance and higher energy costs. 4 direct drive fan. The second pulley is connected to a shaft that drives the fan propeller. There are some advantages and dis advantages direct drive and belt drive exhaust fans and supply fans have over each other.

May 3 2019 fanmann33 8 comments. 7 8 etc the flexible drive coupling loss is immeasurable and ignored so its drive efficiency follows that of an arr. 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. In addition belt driven fans are less efficient than a direct driven fan of equivalent size due to transmission losses.

Direct drive fans should be designed for acceptable bearing life.