Analysis On Magnetic Field And Dynamic Performance Of Homopolar Active Magnetic Bearing

Magnetic field distribution and power loss of homopolar active magnetic bearing (AMB) and dynamic performance of this system are investigated by finite element analysis and actual operation of the system, and compared with the heteropolar AMB system.Homopolar AMB is designed and made, and the homopolar AMB system has been built up based on the original heteropolar AMB system.2-D distribution of line of magnetic field and magnetic field and 3-D vector distribution of magnetic flux density of homopolar and heteropolar AMBs are analyzed by ANSYS software, Power losses of the two kinds of AMBs are calculated and the rule of power loss along with the change of rotation speed is achieved. Modal frequency and modal shape of the homopolar AMB system are also analyzed. Actual operation of the two kinds of ANB systems are carried out.The results show that line of magnetic force of homopolar AMB is parallel to the axis of rotor, coupling effect and power loss of homopolar AMB is smaller than heteropolar AMB, and dynamic performance of homopolar AMB system is better than the heteropolar AMB system.