A novel structure of passive magnetic bearing with axial magnetization

This paper presents a new structure of passive magnetic bearings (PMB) using three ring shape permanent magnets that can increase safety and accuracy in holding rotor in its correct position with greater magnetic force and stiffness amplitude. According to the axial symmetry around the z-axis in the structure of PMB, it is modeled using two-dimensional finite-element method (2D-FEM). Use of this approximation it becomes possible to calculate magnetic force and stiffness in the least computation time. This model includes all magnetic and structural characteristics of PMB. A good comparison for the force and stiffness amplitude is done between previous structure and proposed structure by FEM. By considering force density as a reference, two structures are compared for the financial matters.