Patent ID: 6034465
Filing Date: 2000-03-07
Classification: F04D,H02K

Abstract:
A pump comprising:a pump casing having an inlet and an outlet;an impeller having an impeller plate, a rotary axis and a maximum cross-sectional area of said impeller plate perpendicular to said rotary axis and being rotatably mounted within said pump casing for rotation about said rotary axis, said impeller being configured and positioned relative to said pump casing so that the rotation of said impeller is effective to urge fluid from said inlet to flow through said outlet;a rotor coupled to said impeller plate and rotatable with said impeller, and including a plurality of permanent magnetic poles arranged in a generally flat array, and said rotor having a maximum magnetic cross-sectional area perpendicular to said rotary axis which is larger than the maximum cross-sectional area perpendicular to said rotary axis of said impeller plate; anda stator spaced apart from and generally facing said generally flat array and a plurality of magnetic windings positioned on said stator and adapted to effect rotation of said rotor and said impeller upon energization thereof.