Analysis of a Double Stator Flux Reversal Permanent Magnet Machine With Halbach Array Magnets

Flux reversal permanent magnet (FRPM) machines have been capturing a lot of attention due to their outstanding features such as robust structure, good thermal management, and high fault tolerance capability. However, existing of leakage flux between adjacent magnets, lack of flux focusing effect as well as small area of slots leads to poor torque performance in these types of machines. To enhance the torque characteristic, a novel double stator flux reversal machine with Halbach array magnets (DS-HFRPM) is introduced in this paper. The topology, working principle, and the impacts of major design parameters of the presented machine are investigated, respectively. To show the superiority of the developed design, the performance of the DS-HFRPM machine is then compared with a double stator flux reversal machine with triple-PM excitation (T-DSCPFRPMM) under the same overall dimensions, current excitation, rotor pole number, and nearly identical PM volume with aid of finite element analysis (FEA). The outcomes revealed that the DS-HFRPM machine offers better torque performance as well as magnet usage efficiency compared to its counterpart.