Patent ID: 6139289
Filing Date: 2000-10-31
Classification: F04D,F05B,H02K

Abstract:
A magnetically coupled pump comprising:a housing having a pump chamber and a motor chamber with a partition wall provided therebetween;a rotating shaft inserted into a shaft-receiving portion provided in said partition wall, said rotating shaft being positioned at the center of a stator of a motor disposed in said motor chamber with said stator being provided with a plurality of stator cores that are regularly spaced from each other around said rotating shaft;an impeller fixed to said rotating shaft at a top end thereof protruding into said pump chamber; andan annular permanent magnet fixed to said impeller on a side facing said partition wall to form a part of said motor, said annular permanent magnet having a center radius that is smaller than a radius of a circle connecting centers of a plurality of said stator cores.