Development of Halbach Array for Fractional Electrical Machine with Bonded Magnets

The magnetization of permanent magnets in electrical machines can improve performance, mainly if the Halbach array is used. This particular pattern is generally expensive and complicated to obtain. However, applying the NdFeB bonded magnets can provide a new solution for their versatility. In this context, the study of the Halbach array for the fractional motor has been conducted and compared with the radial magnetization. The first activity concerns designing the rotor geometry through finite element analysis. After that, the permanent magnet brushless motor has been equipped with prepared bonded magnets with the proposed Halbach array. The final comparison has been conducted through several experimental tests. The cogging torque, no-load voltage, iron losses, maximum torque, and efficiency have been examined to confirm the advantages of the proposed pattern.