Patent ID: 6198196
Filing Date: 2001-03-06
Classification: H02K

Abstract:
A device for compensation of magnetic pull forces inside a rotating electrical machine with a discoidal structure comprising:a discoidal rotating electrical machine having a total of at least three rotor and stator discs disposed coaxially and having at least two air gaps between facing rotor and stator discs, each air gap having a respective width between facing rotor and stator discs, wherein the air gaps may have different widths;measurement means for measuring magnitude of the width of each of the air gaps, disposed on a face of a disc defining each air gap and generating signals representative of corresponding gap widths;balancing means for balancing magnetic fluxes extending within the at least two air gaps; anda control unit having inputs connected to said measurement means to receive from said measurement means the signals representative of corresponding gap widths, and including means for comparing the signals from said measurement means to each other and outputting an offset signal, based on a difference between the signals from said measurement means, supplied to a drive module for driving said balancing means, signals from said control unit driving said balancing means to compensate for and cancel an axial magnetic force exerted on at least one of said rotor and stator discs due to differences in widths of the air gaps of the discoidal rotating electrical machine.