Active magnetic bearing

An active magnetic rotor-bearing assembly for conveying a fluid comprising a rotor assembly driven by a motor assembly and a bearing assembly for contactless bearing the rotor assembly to pump the fluid from an inlet opening through the rotor assembly to an outlet opening, wherein the bearing assembly comprises an even number of electromagnetic units arranged around a central structure of the bearing assembly, which provides a fluid channel towards the rotor assembly, each comprising a first salient established by a magnetic material and a permanent magnet at least magnetically connected to the magnetic material providing a first magnetic pole facing towards the rotor assembly and a coil wound around the first salient, where the bearing assembly further comprises an inter joke comprising inter joke portions connected to the first salient of each electromagnetic unit, where the permanent magnets of adjacent electromagnetic units are suitably arranged to provide a closed first magnetic flux via the first salient and the inter joke portions of the both adjacent electromagnetic units and the rotor assembly applying a first attractive force acting on the rotor-assembly for compensating at least present motor and fluid-caused forces at a levitation position of the rotor assembly further comprising a position stabilizing portion perpendicular to the first attractive force on the rotor-assembly, and the coils providing an electromagnetic flux between each first salient and the rotor assembly for applying adaptable axial force and/or tilting torque to the rotor assembly keeping the rotor within the levitation range during rotation and compensating the current motor force and fluid caused force eventually fluctuating and eventually additional forces in order to adjust the bearing provided by the first magnetic flux.