How does a fan rotate?

A Fan comprised of a motor run by electric current, which is attached to fan blades by a shaft. This rotor shaft is run by the motor that makes the shaft rotate around d its axis, and turns the fan blades, at different speeds, depending upon the speed set for the motor.

How does a ceiling fan works?

The rotation mechanism of the ceiling fan is built in way so as to attract the warm air upwards. As the hot air rises up, the blades of the fan slice this air and push it down. This being a continuous process causes the air in the room to circulate in the entire room. Thus, a ceiling fan only moves the air around.

What is the nature of stress in a ceiling fan rod?

tensile
Nature of stress in a ceiling fan rod is tensile assuming frictionless bearing. Bearing stress: Compressive stress arising when one body is supported by another is called bearing stress. It is a type of normal stress. Bending stress: Bending tension and compression produces normal stress.

How does a fan push air?

But, consider how a ceiling fan works. The moving blades of a ceiling fan push the air downward, which blows your body heat away from your skin, thereby cooling you off. The shape and movement of the blades will create an updraft, and the clockwise direction will blow the air on the ceiling.

Why do fans rotate anticlockwise?

Most ceiling fans are designed to cool the area underneath them by spinning in a counter clockwise direction. Because of the angle and pitch of its blades, a ceiling fan circulates air and creates a cool breeze. So in Summer, most ceiling fans should rotate in a counter clockwise direction.

What is the reaction in ceiling fan?

Fans do not reduce air temperature or relative humidity, unlike air-conditioning equipment but create a cooling effect by helping to evaporate sweat and increase heat exchange via convection. Fans may add a small amount of heat to the room due to friction and waste heat from the motor.

What is the nature of citrus is a ceiling fan rod?

Direct, Torsional and Bending stresses act on a ceiling fan rod as it rotates with its cantilever action.

What happens if fan rotates clockwise?

The clockwise rotation of the fan blows the air trapped near the ceiling downwards. So during winters, the warm air inside the room keeps on saturating near the ceiling, while the air below makes us feel cold. Use your fan in a clockwise rotation to keep your room warm.

Which bearing is the fixed bearing on a fan?

The fan’s other bearing should be allowed to float internally or within the housing bore, thus accommodating shaft expansion and contraction. In most fan applications, the bearing closest to the motor or belt drive has the highest radial load and should be the fixed bearing.

How does the oil get to the rod journal bearings?

The rod journal bearings require the same lubrication but they are rotating around the crankshaft at an offset. To get the oil to these bearings, oil passageways run inside the crankshaft – through the main journal, diagonally through the web, and out through holes in the rod journals.

When to fix the rotor side bearing on a steam-generation fan?

Here, it’s sometimes necessary to fix the rotor side bearing so that thermal expansion and contraction of the shaft doesn’t cause the rotor to rub. Recently, at a steam-generation plant, roller bearings in an overhung, direct-drive fan failed within two months of installation.

What is the function of a groove in a rod bearing?

A groove in the main rod bearing allows oil to be continually forced down the passageway to the rod journals, assisted by being flung outwards by the centrifugal force of the rotating crankshaft. The clearances between the journals and bearings are the main source of oil pressure in the engine.