Slotted motors belong to the iron core types. The coil windings of the primary part are inserted into slots within a laminated iron structure. The secondary part is a steel base plate with permanent magnets attached on it. The iron core significantly increases the force output of the motor by focusing the magnetic field of the coil windings.
As a result there is a strong attractive force between the iron core armature (primary part) and the magnet rail (secondary part).
The air gap between the primary part and the magnet rail has to be maintained constantly by a robust guiding system. The slotted iron core causes cogging forces which are suppressed to an acceptable level by various design methods.
Advantages for application:
- high force output approx. 6..8 N/cm(air gap area)
- high efficiency and low heat production