Heat can effected the efficiency of motor,maximum load capacity,duty cycle and winding lifespan.That why heat from motor operation must be controlled by motor cooling.
Motor cooling factor
Below is several factors affecting rate of heat transfer for electric motor cooling :-
1. Ambient air density
This factor is important for motor cooling.If the ambient air density is good,it will effected for reduction of heat transfer from the electric motor.
Total operating temperature will effected with altitude factor.Normally for standard motors,it only suitable for operation up to 1000 metre. For high altitudes,the suitable electric motor for operation normally with 1.0 service factor.
2. Motor enclosure
Motor manufactures design a several types of enclosures.Basically different types of enclosures with different airflow patterns.That mean the quantity of ambient air to contact with the motor is different.
3. Airflow over motor
Heat transfer need a good velocity of airflow for contact over the electric motor enclosure.The value of air flow will effected the cooling process.Commonly for electric motor,manufacture provide the fan for generate the suitable air flow.
4. Frame surface area
Basically if surface area is wide,the heat can tranfer more faster and efficient.So manufacture design the motor enclosure with specific technique to increasing the contact area with the ambient air.
Normally electric motor enclosures designed with many ribs to increase their surface area for motor cooling.