The structure

The rotor or runner

There is a winding in the grooves of the laminated rotor core. This winding usually consists of copper or aluminum and is either injected or inserted into the grooves. These bars are all short-circuited on both sides with a so-called short-circuit ring. The short-circuit rings are made of the same material as the rods.

rotor shaft

The laminated rotor core is firmly attached to a steel shaft. The rotor shaft protrudes through both end shields. The bearing inner rings sit on the steel shaft at these points. As a rule, the A-side is the drive side, which means that the power transmission takes place on this side. The B-side usually has its own fan and, if required, a brake or rotary encoder.

The stator or stator

A winding impregnated with synthetic resin is incorporated into the laminated core of the stator. The number of coils and their width are designed differently for different motors, which means that a different number of pole pairs and thus a different speed is achieved. The laminated core forms the stator with the motor housing.

Motor housing

The motor housing is often made of die-cast aluminum for small outputs, gray cast iron is usually used for higher outputs. The terminal box is mounted on the motor housing, the terminal board is located in the terminal box, to which the switching ends of the stator winding are connected. In order to achieve better self-cooling, the motor housings have cooling fins all around to enlarge the surface.

Rolling bearings

The bearings in the end shields connect the rotating part with the stationary part of the motor. As a rule, the bearings are deep groove ball bearings. Depending on the application, cylindrical roller bearings are also used for increased transverse forces on the drive side. The bearings are either permanently lubricated or can be relubricated, usually with grease.

Bearing signs

End shields are made from various materials, such as gray cast iron or die-cast aluminum. The end shields close the engine compartment. The outer rings of the bearings are also located in the end shields.

fan / fan cover

An internal fan is installed on the B-side so that the heat generated on the cooling fins is transported away. The internal fan is enclosed by the fan cover and sucks in cooling air through a protective grille. & Nbsp; The cooling air flow is guided through the cooling fins of the motor housing through the fan cover