For AC induction motors, cooling air is usually circulated internally and externally by one or more fans mounted on the rotor shaft. … These are designed to keep the air flow close to the surface of the motor along its entire length, thus improving the cooling and self-cleaning of the ribs.
What is the main advantage of having an electric cooling fan compared to a directly driven fan?
A key advantage of electric fans is increased engine cooling and improved air conditioning cooling at idle, when it is most needed. In addition, replacing an engine-driven fan can increase horsepower and improve fuel economy as the engine drag from turning the fan is eliminated.
What is an electric engine fan controlled by?
The fans are controlled either with a thermostatic switch or by the engine computer, and they turn on when the temperature of the coolant goes above a set point. They turn back off when the temperature drops below that point.
Does an electric fan increase horsepower?
The mechanical to electrical conversion in the alternator to drive the electric fan is not 100% efficient, so the engine will have to make slightly more power to provide the electric fan the same horsepower.
What is the purpose of vent openings on a motor?
Although the motors only work for indoor applications in a clean environment, the vent openings can prevent liquids and moisture from entering the motor from specific angles. Along with the downward angle of the vents, the location of the vents protects the windings from direct water or moisture.
What is the disadvantage of electric fan?
Apart from these advantages, there are some the disadvantages to using an electric fan, including it’s not effective at cooling if the location is already rather hot in terms of temperature. Another disadvantage is that it’s not 100%, especially around young children, due to the potential exposure of the fan’s blades.
What temp should my electric fan turn on?
Your radiator fan should kick in at about 200 degrees Fahrenheit. If you notice your vehicle is overheating or at the very least running hotter than it normally does, listen for the fan to see if you can hear it.
Should radiator fan turn on when AC is on?
Both radiator fans should always run when the AC compressor is engaged. … To check the temperature at which the fan comes on, turn the A/C off and keep the engine running until it reaches normal operating temperature. Most fans should come on when the coolant reaches about 200 to 230 degrees.
Should engine fan run all time?
An electric fan SHOULD NOT run all the time. A mechanical fan WILL spin as long as the engine is running, but it will only ‘lock up’ when needed. … Both radiator fans should always run when the coolant temperature sensor in the bottom tank of the radiator reaches about 212*F.
How can you tell if a fan relay is bad?
One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly.
Is an electric fan better than a clutch fan?
The clutch fan draws power from the engine due to the added load…. The electric fan saves power due to no load on the engine…. Clutch fans are better because they only apply a load at idle or low speed and don’t require wiring… Electric fans save power but add weight and require a lot of wiring…
What is better clutch fan or electric fan?
When compared to an electric fan, fan clutches are quite inefficient. … The benefits of a Thermatic Fan lay in its ability to provide constant air flow, improved fuel economy, better air-conditioning performance, cooler engine running and increased engine power.
Are electric fans worth it?
Although they will place an additional draw on the electrical system, they are a more efficient alternative to mechanical fans and don’t cause the dreaded parasitic horsepower loss. Here are a few other advantages of electric fans: Consistent cooling—they maintain their airflow at all times. Reduced water pump wear.
What are 4 common types of motor enclosures?
The most common types of enclosures are:
- Open Drip Proof (ODP) …
- Weather Protected (WP1 / WP2) …
- Totally Enclosed Fan Cooled (TEFC) …
- Totally Enclosed Non-Ventilated (TENV) …
- Totally Enclosed Air Over (TEAO) …
- Totally Enclosed Forced Ventilated (TEFV) …
- XP (Explosion Proof)
Do electric motors need cooling?
On all electric vehicles, air cooling is a method relied upon to keep both the electric motor and the battery cool. Since the motor is so much smaller than a comparably-powered ICE engine, a higher volume of air can pass around it.
How do I keep my electric motor cool?
Another method to remove heat from electric motors is by providing forced air cooling. This is commonly done by providing an electric fan to blow air over the motor. Force air cooling can reduce the amount of heat transferred into the machine structure and allow the motor to be operated at a higher load point.