Magnetic clutches

Multi-plate clutches, type ELA

Multi-plate clutches, type ELA

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The driving part of the coupling is the shell and the set of the outer steel multi-plates. The driven part is the magnet body with forced off and also driving pins, distance bush and anchor plate with the adjusting nut and the set of the internal multi-plate with the friction lining, according to the kind of the operation (lubricated or dry).

The exciting coil is fastened on the carrier, that is seated on the antifriction bearing on the magnet body, it carries also the supply grips of the exciting current and does not rotate.

The rotating magnet body is magnetized by the taking in of the exciting current into the coil, it attracted the anchor and on it seated adjusting nut will press the set of the alternated internal and external multi-plates. By the friction the torque is transmitted. After interruption of the exciting current the pins will press out the anchor plate on the flange of the distance bush and the multi-plates set is released step-by-step.

The ELA coupling is adjusted by simple method. The aluminium adjusting nut has on its internal surface 24 gaps, into which fits the spring-loaded ball, seated in the anchor plate. Arrestment prevents reliably the non-requested moving round a slight amount of the nut also at fast reversing, because the nut has five times smaller moment of inertia than the steel one. But by the forcing in on the radial ribs of the nut it is possible to get over the arrestment and the nut overtighten in both direction of the slots pitch. It is possible to handle with no screws. The lead is 1.5 mm and the air gap is changed of 0.0625 mm by overtightening of one slot (1/24 of periphery).

Advantages of the ELA ringless couplings:

  • exciting current supply is executed on the clamps on the coil carrier, the couplings do not need the brushes holders and brushes,
  • they have the adjusting nut and supporting surface of the multi-plates from the aluminium alloy (5x lighter than ELK). So the moment of inertia of the anchor plate with the adjusting nut is considerable decreased and the possible difficulty with the driving pins at reversing will be removed,
  • both aluminium parts direct considerably the magnetic flow into the functional places and decreased its scattering,
  • the adjusting nut is quite new construction, arrested by spring-loaded balls only,
  • the adjustment by the adjusting nut is very easy also in the inaccessible places, it is not possible to handle with the securing screw of the nut,
  • moment of inertia of the magnet body and with it connected parts is enough decreased, partly by the aluminium parts and also by it, that the exciting coil does not rotate.



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