Permanent magnet (PM) tubular machines have been applied to many applications, since they offer high force density with no end winding and no net attractive force between the mover and the stator. In this paper, two novel PM tubular machines named partitioned stator interior PM (PS-IPM) and partitioned stator surface-mounted PM (PS-SPM) tubular machines are proposed. Both the proposed machines are optimized for maximum thrust force, and their electromagnetic performance has been compared. It is found that the PS-IPM tubular machine has higher thrust force capability and better magnet utilization compared with the PS-SPM tubular machine. However, due to lower cogging force, the PS-SPM tubular machine has fewer thrust force ripples. Furthermore, the effect of the cross-coupling magnetic saturation on PM flux linkage, and the d-axis and q-axis inductances for both the proposed machines is investigated. It is demonstrated that the PM flux linkage and the d-axis and q-axis inductances are affected by the cross-coupling magnetic saturation. Moreover, the force-velocity characteristics of the proposed machines are calculated and compared. It is observed that both the machines have good constant power operation capability.
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Zhu et al. (2015) studied this question.
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