Performance optimization design and analysis of bearingless induction motor with different magnetic slot wedges

Abstract

Abstract This paper investigates the application of using magnetic wedges in a semi-closed slot bearingless induction (BI) motor. In this strategy, the electrical loss of the motor can be reduced, improving the overall efficiency. At the same time, the temperature rise of the winding is reduced, and the vibration and noise levels are greatly depressed, which prolong the service life of the motor. First, the principle of BI motor operation is introduced. Second, the different magnetic permeability and geometric shape of the magnetic wedge are taken into consideration during the analysis the proposed BI motor. Then, the performance of BI motor with magnetic wedge is analyzed by finite element method. Finally, the results show that too high relative permeability materials can degrade the performance of the BI motor, thus, the use of suitable permeable magnetic wedge is reasonable. After adding the optimal magnetic wedge, the torque ripple, motor efficiency and the suspension force of the BI motor are optimized. The use of magnetic wedges has economic advantages and is of great significance for improving the performance of BI motors.