Patent ID: 6388346
Filing Date: 2002-05-14
Classification: F04D,H02K

Abstract:
An axial fluid flow inducing device comprising:a housing; a plurality of aligned impellers disposed within said housing, and each of said impellers mounted in said housing for rotation about a common axis; each of said impellers having a series of radially extending blades; a magnetically permeable enclosing structure surrounding said impellers and defining a fluid flow passage; magnetic drive means for each impeller comprising impeller portions permanently magnetized so as to establish radially spaced magnetic poles, an outer pole of each portion located at an outer region of each impeller, each successive outer pole having an opposite polarity from each adjacent pole; said magnetic drive means further including pulsed magnetic field generating means comprising electromagnetic driver coil means disposed adjacent an outer perimeter of each of said impellers, said pulsed magnetic field generating means establishing a magnetic field with a pole adjacent said outer poles of said magnetized portions of each of said impellers when energized with electrical power; circuit means causing pulsed energization of said driver coil means so as to alternately cause opposite magnetic poles to be established thereby in timed relationship to rotation of said magnetized portions of said impellers to produce rotation thereof by magnetic attraction and repulsion; wherein said impellers are mounted for independent rotation with respect to each other; wherein said magnetic drive means interacts with each of said impeller magnetized portions to produce said independent rotation; and wherein one magnetic drive means causes rotation of two of said impellers in opposite directions.