Motor pulleys are adjusted by loosening the set screw and turning the top half of the pulley see illustrations at right.
Belt driven or direct drive fan.
For most the direct drive record player s unwanted vibrations are enough to opt for a belt drive.
To begin with industrial fans that are belt driven offer a greater level of flexibility when it comes to determining the rpm speed of a fan.
Belt drive fans have two additional bearings.
Unlike belt driven fans there s less energy loss because there s a reduced amount of friction as the fan operates.
Belt drive fan from commercial electric is a prudent choice for just about any industrial application.
Belt driven design for quieter operation and longevity.
One advantage of choosing a belt drive over a direct drive is that it is capable of adjusting the fan rpm which enables the fan to move more air if necessary.
For airstream conditions hostile to arrangement 4 fans a shaft driven direct or belt drive fan is the recommended choice.
Direct drive fans have no power transmission loss since the propeller is directly connected to the motor shaft.
Where on a belt drive fan the fan motor shaft has a pulley connected by a belt to a second pulley.
Equipped with handle wheels and nonskid positioning stands.
Deciding between a direct drive fan and a belt drive fan is fairly straightforward once you know all of your other variables like fan size application space fan speed needs and likely wear and tear in your application.
It s a motor connected to your fan in one of only two ways.
Instead the motor shaft is connected to a belt and the belt is connected to the fan.
Where people and machines need to be kept cool in the factory warehouse or other large area or to keep animals comfortable and remove stale air and odors from the barn look to this rugged power packed air circulator.
What direct drive turntables possess in durability they sacrifice in overall quality.
An hvac system with a belt drive fan is slightly different.
The two bearings on direct drive fan motors which are 7 horsepower and larger are typically regreaseable.
Many direct drive record player owners in fact purchase shock absorbers to lessen the noise.
Shaft driven fans can be fitted with shafting materials and shaft seals that are compatible to the airstream conditions at a lower cost than modifying an arrangement 4 fan.
Direct drive fans should be designed for acceptable bearing life.
Direct drive or belt drive.
Thus the fan blades will rotate at the same speed as the motor rotates.
In a direct drive configuration the fan motor that controls the movement of the fan blades is connected either to a shaft or fan axle.
In the later there is a belt sometimes more than one connecting the motor to move the fan.
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.
The second pulley is connected to a shaft that drives the fan propeller.
With a belt driven configuration the movement of the fan is not directly related to the rotation of the motor shaft.
In the former the motor connects to the fan wheel with nothing in between.
Greater efficiency is the biggest pro of direct drive fan configurations.
