Patent ID: 9162019
Filing Date: 2015-10-20
Classification: A61M,F04D

Abstract:
1. A pump comprising: a housing; at least one impeller; and a motor for imparting rotation to the at least one impeller, the motor comprising: a stator supported in the housing; and a rotor assembly comprising a rotor supported in the housing for rotation relative to the stator about an axis; the stator comprising a stator core comprising first and second laminations spaced from each other along the length of the stator core, and motor windings wound around the first and second laminations; the rotor comprising a rotor core; a first magnet assembly that extends around an axial portion of the rotor core and a second magnet assembly that extends around a second axial portion of the rotor core, the first and second magnet assemblies being spaced from each other along the length of the rotor, wherein the first lamination and first magnet assembly act as a first driver for the motor, and the second lamination and second magnet assembly act as a second driver for the motor, the pump further comprising: a first impeller operatively coupled to a first axial end of the rotor for rotation with the rotor about the axis; and a second impeller operatively coupled to a second axial end of the rotor, opposite the first axial end, for rotation with the rotor about the axis, the rotor assembly being movable along the axis relative to the housing to adjust hydraulic performance characteristics of the pump; wherein the pump is configured such that fluid inlet pressures acting on the first impeller exerts an axial force on the rotor assembly in a first direction along the axis and fluid inlet pressures acting on the second impeller exerts an axial force on the rotor assembly in a second direction along the axis, opposite the first direction.