The housing is made of a robust material to give support and protection to the engine and the materials that form it are varied, and are mainly based on the application and exposure of the engine 3 hp 182T motors. For motors for domestic use or where the equipment to which they will be coupled provides protection enough, the housing is nothing more than a support for the stator plates.
In applications where the engine will be exposed to aggressive or even explosive atmospheres, mechanical protection will not be enough, and differential seals and paints are used to make the carcass resistant to the aggressions you will encounter. The most common materials for the casing in industrial motors is cast iron (Fe + [2.11% – 6.77%] C), which is tough, easily machinable and cheap.
As it is in the fixed part of the engine, its weight is of minor importance and another important factor of the cast iron is its good thermal conductivity, essential for armored motors. In this type of electric motors, we find fins distributed around its outer surface, made there to raise the surface of contact with the air and thus to increase the thermal dissipation of the motor.