Patent ID: 6232696
Filing Date: 2001-05-15
Classification: F04D,H02K

Abstract:
A vacuum generating apparatus comprising:a centrally located stator having upper and lower sides, the stator including a number of stator coils integrally mounted in a disc-shaped supporter;a rotating shaft that is rotatably supported in the stator;upper and lower rotors spaced by a predetermined distance from the stator and respectively disposed at the upper and lower sides of the stator, the upper and lower rotors having a plurality of N-pole and S-pole magnets divided therebetween and alternately arranged along a circumferential direction of the upper and lower rotors, the upper and lower rotors being rotated by an interaction between the plurality of magnets and an electromagnetic force of the stator coils;upper and lower impellers respectively fixed to the upper and lower rotors, each of the upper and lower rotors having (a) a disc-shaped magnet holder having a plurality of insertion holes into which a respective portion of the plurality of magnets are received and a plurality of combining protrusions which are used in combination with the impellers, and (b) a disc-shaped magnet plate overlaying the magnet holder and forming a magnetic circuit, the magnet plate having a plurality of combining through holes formed therein, whereby the plurality of combining protrusions of the magnet holder are inserted and fixed into corresponding fixing grooves formed on a lower plate of a respective impeller through the plurality of combining through holes of the magnetic plate; and,upper and lower housings each having a centrally disposed suction inlet formed therethrough, the upper and lower housings having respective outer circumferential portions combined with the disc-shaped stator supporter such that air drawn through the suction inlets is guided to a discharging outlet through passages defined between each housing and the disc-shaped stator supporter.