A High Magnetic Flux Density Lorentz Force Magnetic Bearing Design Method with Suction and Combined Magnetic Steel

Abstract

In order to solve the problems of low magnetic flux density and non-uniformity of magnetic flux density of traditional Lorentz force magnetic bearing (LFMB), a combined magnetic steel single closed magnetic loop magnetic bearing with suction type is designed. Firstly, the magnetic field intensity and magnetic field uniformity of the traditional LFMB are analyzed, and the existing problems of the traditional LFMB are pointed out. Then, a new LFMB structure is designed. The concepts of magnetic field mean value and standard deviation are introduced to describe magnetic field intensity and magnetic field uniformity. By analysis of the 2-D and 3-D magnetic flux characteristics of the proposed LFMB, it can be seen that the magnetic flux density of the new LFMB is 0.67–0.74 T, and the magnetic flux uniformity is 0.009–0.0192. By comparing the conditions of applied current and 0 current, we can see that the structure designed in this paper can reduce the influence of current on the magnetic field uniformity. Finally, by comparing the control effects of the traditional structure and the proposed LFMB structure, it can be concluded that the proposed method can reduce the power consumption and improve the precision of the output torque.