SELECTED MAGNETOSTATIC ANALYSIS OF 3 （选择静磁分析3）.pdfVIP

SELECTED MAGNETOSTATIC ANALYSIS OF 3 COILS ACTIVE MAGNETIC BEARING Adam Piłat AGH University of Science and Technology Abstract The calculations of the magnetic field generated in the 3 coils Active Magnetic Bearing (AMB) are important in the bearing design. The numerical analysis allows to check if the new proposed AMB structure is effective with respect to levitation forces, magnetic field properties and electro-mechanical interactions. The electromagnetic field distribution and density analysis allows to verify the designed AMB parameters and the influence of the shaft and coil currents. A simplified, two dimensional model of the AMB is considered where effects associated with stator and shaft lengths are omitted. The AMB geometry and effects coming from the shaft movement are under consideration. The performed analysis plays an important role in the design procedures of AMB and helps in the verification of the construction assumptions. 1 Introduction In recent years a number of machines with Active Magnetic Bearings were designed in order to eliminate the lubricant medium, vibration, noise and to achieve high velocities and loads. These systems are complicated due to mechanical, electrical and electronic circuits construction. A wide range analysis is required during the designing procedure – from the construction stage up to the development of the control algorithm architecture. The finite element method can be a tool for magnetic field analysis. Many scientists working on magnetic bearings or self bearing motor