According to the defects of the present radial hybrid magnetic bearing

the configuration and fundamental principle of a novel permanent magnetic bias radial magnetic bearing are introduced in this paper. The flux path was analyzed by using equivalent magnetic circuit

and the mathematics models of magnetic bearing were deduced. The parameter’s design method was also presented. Finally

the radial magnetic bearing was simulated and calculated by using FEM so as to check the decoupling characteristic of the excitation magnetic flux between X and Y direction through two methods

one was magnetic field distribution and the other was the influence to force Fy while plus current ix in X direction’s coils. The influence was testified very little that the force Fy was less than 3% of the force Fx which almost can ignored. The theoretic analysis and simulation have shown that this novel radial magnetic bearing can avoid the coupling between X and Y direction effectively compared to the existing structure. As a result

the control will be more easier and the performance can also be improved.