Rotor with stabilizing magnets

Claim 1

A pump-motor-unit with a dry and a wet compartment separated by a magnetically permeable spherical wall (8), the dry compartment comprising a magnetic device (25,28) which produces a rotating magnetic field causing rotation of a spherical armature (3,33) rotatably and tiltably supported in its center, mounted in the wet compartment, that armature forming a rotary unit with an impeller (14,34,44) which contains a bearing cap (15) forming together with a stationary convex spherical counterpart (5) a spherical step bearing which supports the rotary unit (3-14, 33-34) radially and in the axial direction towards the stationary couterpart (5) of the cap (15), said stationary counterpart (5) being supported by the casing on a stationary structure (7), the rotary unit (3-14,33-34) being pushed during operation by the axially directed vector of the magnetic forces generated by said magnetic device (25,28) toward said magnetic device (25,28) counteracting movement of the rotary unit (3-14,33-34) in the direction (23,35) away from the magnetic device (25,28), said rotary unit (3-14,33-34) comprising a concentric annular permanent magnet (10,20,30) forming an unobstructed gap (6a) with a stationary annular permanent magnet (12,22,32) mounted inside the wet compartment, both magnets being magnetized perpendicular to the surface of said gap and both magnets facing the gap with their sides of the same polarity thereby generating thrust to stabilize the rotary unit (3-14,33,34) and to prevent axial movement.