Research on a Transverse-Dislocated Magnetic-Field Modulated Brushless Contra-Rotating Machine Adopting Different Core Material Combinations

This article proposes a transverse-dislocated magnetic-field modulated brushless contra-rotating machine (TDMFM-BCRM) with a multiunit structure for the contra-rotating propulsion system (CRPS). Compared with the existing contra-rotating machines (CRMs), it has the advantages of equal and opposite torque at any time, no brushes, and no slip rings. The improved 3-D magnetic-field modulation (MFM) principle by considering the multiunit structure of the TDMFM-BCRM is investigated. Then, due to the structural complexity of the TDMFM-BCRM, there are some challenges in its manufacturing. Therefore, the performance of the TDMFM-BCRM adopting different core material combinations including electrical steel (ES) and soft magnetic composite (SMC) material is investigated. Meanwhile, a prototype is manufactured and tested to validate the theoretical analysis, finally, more manufacturing methods for the TDMFM-BCRM are comparatively studied.