Working principle Verdermag mag drive centrifugal pumps

A magnetic coupling consists of two magnet assemblies. One is the outer assembly (the drive magnet) and the other is the inner assembly (the driven magnet). The outer assembly is connected to a motor and the inner assembly is directly attached to the pump impeller. As illustrated, at rest, the magnet components of the outer assembly are aligned with their counterparts in the inner assembly. When load (torque) is applied, the coupling deflects angularly and the magnets create a force of simultaneous attraction and repulsion. This force is used to transfer torque from the motor to the impeller. Verdermag mag drive pumps are therefore sealless and hermetically closed.

No slippage, no induction currents

The permanent magnet coupling in the Verdermag mag drive centrifugal pump causes neither slippage nor induction currents during rotation. If excessive torque is applied, the magnets will de-couple. The magnets will not re-couple unless the pump is stopped. There is no energy loss in a permanent coupling unless an electrically conductive containment is placed between the outer and inner magnets. If an electrically conductive material is used for the containment, eddy-currents will be generated which will cause some energy loss. Verdermag mag drives use no conductive materials and therefore have no or only small eddy current losses.

And what about the working principle of the metallic mag drive pumps?

In addition to the above, the Verdermag metallic magnetic driven pumps utilise the differential pressure generated by the pumping action to create a flow around the bearings and magnets. The pumped liquid acts as a cooling medium to dissipate the heat generated from eddy currents as the magnets pass around the containment shell. It is also used to lubricate the hydrodynamic bearing sets, with flow from the front bearing passing through the balance holes of the impeller and flow around the rear bearing re-entering the low pressure suction area of the volute.

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