The housing of an electric motor 1.5 hp 56c motor is composed of cast iron and serves as the mechanical support for the stator, rotor and winding terminals. In the manufacturer’s catalogs, the electric motor has its casing indicated by a number, for example, 1-HP motors use casing 71. This expresses that the distance (H) between the fulcrum of the motor (foot) and the center of the casing is 71 mm. This measurement gives an idea of the dimensions of the machine.
Motors with coiled rotors have in their construction rings and brushes, which have the function of connecting a point of the rotor to the outside. Rings and brushes make up machine points where concerns about wear and tear and maintenance costs are important. Bearings and bearings are other items that increase maintenance costs, aim to support the rotor shaft in the housing and facilitate the rotation of the rotor, require lubrication to reduce friction, wear over time causes the engine to become noisy and vibrate more. To avoid moisture accumulation in stator windings, large power motors usually have a small auxiliary circuit inside the housing.