Patent ID: 6043580
Filing Date: 2000-03-28
Classification: F04D,F16C

Abstract:
Rotodynamic machine for the forwarding of a fluid comprising:first and second radial bearings and a shaft, the radial bearings being spaced apart in a longitudinal direction of the shaft and supporting the shaft; one of a compressor wheel and an impeller arranged on the shaft between the radial bearings; an electrical machine with a stator for driving the shaft; at least one of the first and second radial bearings and the electrical machine being combined to define a drive and bearing apparatus forming a first bearing-free motor; the drive and bearing apparatus comprising a rotor, the stator and electrical windings surrounding the rotor, and the rotor comprising part of the shaft; the rotor, the stator and the electrical windings being mutually matched and arranged to define means magnetically journalling the shaft without contact and producing an electromagnetically induced torque on the shaft to thereby form the bearing-free motor; wherein the electrical windings comprise a first set of electrical windings for producing the torque having a number of pole pairs n, and a second set of electrical windings for producing a magnetic bearing force for magnetically journalling the shaft and having a different number of pole pairs n+1 or n-1.