The motor of the canned motor pumps manufactured by OPTIMEX are asynchronous motors. Their particularity lies in the encapsulation of the stator by an air gap liner. Thus the stator is isolated from the pumped liquid which circulates in the rotoric chamber. This leads to the removal of the mechanical seal commonly used on standard centrifugal pumps.
To achieve this encapsulation, electrically conductive metal liners are usually used. When the rotating magnetic field generated by the stator is passing through this liner, they generate eddy currents. This phenomenon causes a significant energy loss and, more importantly, an increase of the engine power.
OPTIMEX has therefore focused on this key point by studying the possibilities of using non-conductive materials for this liner, as well as synchronous motors with permanent magnets for which the magnetization of the rotor is provided by permanent magnets.