Abstract: The mechanism is studied for permanent magnet biased AMB to produce magnetic suspension force. The basic equation of magnetic circuit and the equation of suction are derived when permanent magnet flux and electromagnetism flux simultaneity is effected for PMEB(permanent magnet electromagnetism bearing). The paper also analyzed the effect of permanent magnet parameters on the carrying capacity and stiffness of PMEB.It is concluded that the practical carrying capacity reaches a maximum when biased magnet flux is over moiety of saturation flux, and loading capacity of HMB can be raised; furthermore the power consumption can be lowered when increasing the interior magnetomotive of permanent magnet.

Key words: PMEB, suspension force, mechanism, carr ying capacity