Magnetic field analysis of bearingless permanent magnet motor

As bearingless motors have all advantages of magnetic bearings; they play an important role in solving difficult problems of special electric drives. The simplest and most versatile form of bearingless motor is the bearingless slice rotor motor. This kind of motor with centrifugal pump has a wide range of applications in life science, chemical processing industry, semiconductor manufacturing industry, foodstuff processing industry, and so on. This paper presents the analysis of the operational principle, basic equations is given for a bearingless permanent magnet slice electromotor first. Then a modeling of a bearingless permanent magnet slice electromotor is built using Maxwell 3D of ANSOFT finite element software. Finally, the magnetic field and the torque force are analyzed for the two different structures of P_B=P_M±1. According to the analytic results, the structure of P_B=P_M+1 is more steady. In addition; its control is easier to get in the actual implementation and application.