Comparative Study of Novel Tubular Partitioned Stator Permanent Magnet Machines

Abstract

Permanent magnet (PM) tubular machines have been applied to many applications since they offer high force density with no endwinding and no net attractive between the mover and the stator. In this paper, two novel PM tubular machines named as partitioned stator interior permanent magnet (PS-IPM) and partitioned stator surface mounted permanent magnet (PS-SPM) tubular machines are proposed. Both proposed machines are optimized for maximum thrust force, and their electromagnetic performances have been compared. It is found that the PS-IPM tubular machine has higher thrust force capability and better magnet utilization compared to the PS-SPM tubular machine. However, due to lower cogging force, the PS-SPM tubular machine has less thrust force ripples. Furthermore, the effect of the cross-coupling magnetic saturation on PM flux linkage, and d-and q-axis inductances for both proposed machines is investigated. It is demonstrated that the PM flux linkage, and d-and q-axis inductances are affected by cross-coupling magnetic saturation. Moreover, the force-velocity characteristics of proposed machines are calculated and compared. It is observed that both machines have good constant power operation capability.Index Terms-Partitioned stator, linear machine, permanent magnet, tubular machine, thrust force. 0018-9464 (c)

Overview of novel magnetically geared machines with partitioned stators

“…Based on the concept of PSs, numerous other types of PS machines can be developed, e.g. doubly fed dual-stator reluctance and induction machines as mentioned in Section 2 [20][21][22][23], linear/ tubular [110,111] and axial-field [112][113][114][115] PS machines, as well as PS memory machines [116] based on the concept of online magnetising and demagnetising PMs [117][118][119][120]. However, due to space limit, they are not being reviewed in this paper.…”

Recent development of linear machine topologies and applications

“…PPFSLM can also adopt planar and tubular format, as shown in Fig. 11 [14][15]. The cost is much lower for FSLMs, especially in long stroke applications.…”

Analytical Analysis of the Slotted Double-Sided Linear Flux Switching Permanent Magnet Motors by Considering Different Layers of Winding

“…It has been extracted that the proposed machine can enhance thrust force and reduce thrust ripple. Two topologies of tubular partitioned stator machines with interior PMs and surface mounted PMs were studied in [10]. The electromagnetic performances, including the PM flux linkages, thrust force capabilities, thrust ripples and d-and q-axis inductances have been comprehensively compared.…”

“…A novel switched flux permanent magnet (SFPM) machine with a partitioned stator structure is studied in [8]. Tubular structures have been carried out [9]- [10]. In [9], a flux reversal permanent magnet (FRPM) linear machine with partitioned stator was presented and compared with the conventional FRPM counterpart.…”