Drive Technology
Air Gap
The air gap is the distance between the inner and outer rotor of a magnetic coupling — including the wall thickness of the containment shell. It is the most important variable for the transmittable torque.
Effect on Torque
The magnetic coupling weakens sharply as the distance increases: even small increases in the air gap reduce the transmittable torque significantly (disproportionately). In design, the air gap must therefore reliably accommodate the containment-shell wall, manufacturing tolerances and a safety margin. A gap reduced by wear or deformation, on the other hand, can lead to increased eddy-current losses and heat.
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