A pump includes an impeller, a stator, and a plurality of magnets forming
bearing poles coupled to a selected one of the stator or the impeller. The
pump further includes a plurality of shorted coils coupled to the other of
the stator and the impeller. The plurality of bearing poles and shorted
coils co-operate to form an electrodynamic bearing during rotation of the
impeller. The electrodynamic bearing supports the impeller either axially
or radially during operation of the pump. Hydrodynamic bearing surfaces
are provided for generating a hydrodynamic bearing between the impeller
and stator. The plurality of magnets may comprise a plurality of distinct
magnetic elements or a single element comprising a plurality of distinct
magnetic domains. The plurality of distinct magnetic elements or domains
may be arranged to form a Halbach array.
