Pump Couplings

Magnetic rotary couplings are often used by pump manufacturers to isolate a motor from the pump components. The isolation of these components might be desirable for one or more reasons. The fluids in the pump may be corrosive, toxic, under pressure, or sensitive to corrosion from motor lubricants or other materials.

The coupling would typically consist of a pair of multipole magnet rotors interacting across a membrane made from a composite, plastic or metal, depending on the pump application. The performance of these couplings depends on several factors, including:

Separation of magnets
Number of pole pairs
Membrane material
Load inertia and acceleration
Presence of torsional resonance

Membrane materials are sometimes metal alloys and are therefore conducting. In these cases, it is possible to quantify the resulting eddy current losses which will occur and minimise these by ensuring an appropriate choice of material and wall thickness.

“Best Solution can support engineers engaged in their own development programmes. We can provide advice and guidance on simulation technique, or more specific coaching on design methods for electromagnetic devices, materials, test and measurement.”

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