Pole faces

Pole faces are magnetically active areas within electromagnetic spring-applied brakes that play a central role in the generation and transmission of braking force. In a holding brake or working brake, these surfaces ensure that the magnetic field is efficiently conducted between the armature plate and the magnetic body. The quality and geometry of the pole faces have a significant influence on the efficiency of the entire electromechanical brake. A precise design of the pole surfaces is crucial in order to reliably achieve the desired holding force or braking effect, particularly in the case of safety brakes or fail-safe brakes that are active when de-energized.

In a spring-applied brake or electric spring-applied brake, the magnetic force is transmitted via the pole faces as soon as current is applied and the spring force is released. The even distribution of the magnetic field across the pole faces ensures a stable and repeatable braking effect, which is particularly important for power-off brakes. By optimizing the pole surfaces, the electromagnetic spring-applied brake can not only work more efficiently, but also extend the service life of the brake and reduce the thermal load.