Study of Two Kinds of Double-Sided Yokeless Linear Flux-Switching Permanent Magnet Machines

Hao, Wenjuan; Wang, Yu; Deng, Zhiquan

doi:10.1109/vppc.2016.7791786

Cited by 7 publications

(9 citation statements)

References 21 publications

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“…Single-sided LPMFSMs suffer from the drawback of high normal (attraction) force. This drawback increases friction force and exerts additional unbalanced forces on bearings and allied facility, hence reducing overall machine efficiency [5,9]. Whereas double-sided LPMFSMs has zero average normal force over one electrical period [3,5].…”

Section: Introductionmentioning

confidence: 99%

Performance comparison and optimisation of dual mover linear permanent magnet flux switching machine

Ullah

Khan

Basit

et al. 2019

IET Electric Power Applications

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Short moving primary and rigid low-cost secondary are important requirements of linear machines designed for long stroke applications. In the race, linear permanent magnet flux switching machine (LPMFSM) is a competitive candidate by confining excitation sources to short mover, thus making stator robust and low cost (made of only iron). However, single-sided LPMFSM exhibit a demerit of high normal (attraction) force due to its topology. In order to rectify the problem and enhance thrust force profile, two novel double-sided LPMFSMs are proposed with dual stator and dual mover topologies. After stator pole study, both topologies with same design dimensions are analysed and compared by 2-D finite element method here. Detailed analysis revealed that 12/14 DMLPMFSM exhibit low numerical values of thrust force ripples and detent force while maintaining average thrust force value. Hence, 12/14 DMLPMFSM is selected and optimised by structure-based deterministic optimisation (SBDO) approach to further enhance thrust force profile. Finally, comparison of initial and optimised design of 12/14 DMLPMFSM is presented to validate optimisation procedure.

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Section: Introductionmentioning

confidence: 99%

Performance comparison and optimisation of dual mover linear permanent magnet flux switching machine

Ullah

Khan

Basit

et al. 2019

IET Electric Power Applications

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“…Generally, there are two forms of double‐sided LFSPM (DSLFSPM) machines, which are DSLFSPM machine with middle secondary [11] and DSLFSPM machine with middle primary [12, 13]. Hao et al [14] analysed two kinds of double‐sided LFSPM machines with yokeless primary and yokeless secondary, respectively. As can be found from [14], the yokeless structure combining with the design that makes the magnetic circuits in series can improve the thrust force density of both kinds of yokeless LFSPM machines.…”

Section: Introductionmentioning

confidence: 99%

“…Hao et al [14] analysed two kinds of double‐sided LFSPM machines with yokeless primary and yokeless secondary, respectively. As can be found from [14], the yokeless structure combining with the design that makes the magnetic circuits in series can improve the thrust force density of both kinds of yokeless LFSPM machines.…”

Section: Introductionmentioning

confidence: 99%

“…However, the middle secondary double‐sided linear sandwiched FSPM machines are not reported in the current literature, therefore, in this paper, a middle secondary double‐sided sandwiched LFSPM (DSSLFSPM) machine is investigated to reach high thrust force density. A cogging force reduction method is proposed for the yokeless double‐sided LFSPM machines in [14], however, this method will decrease the thrust force capability while reducing the cogging force. In this paper, a staggered stator teeth structure is employed for the DSSLFSPM machine to reduce the thrust ripple without thrust force density decrease, namely, DSSLFSPM‐ST machine.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of double‐sided sandwiched linear flux‐switching permanent‐magnet machines with staggered stator teeth for urban rail transit

Hao

Wang

2018

IET Electrical Systems in Transportation

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Linear flux-switching permanent-magnet (LFSPM) machines exhibit significant potential in many applications. A double-sided sandwiched LFSPM (DSSLFSPM) machine with high thrust force capability is investigated in this study. After being optimised for optimal thrust force using Maxwell 2D, this machine is found to deliver higher thrust force when compared with an optimised conventional 12/14 LFSPM machine. However, low thrust force ripple is also required in many applications. Thus, in order to reduce the thrust force ripple, the DSSLFSPM machine is improved by a staggered stator teeth structure and an end permanent-magnets method, then, two improved machines are obtained. The improved machines can reduce the thrust ripple to a very low level without thrust force density decrease. Further, the stator yoke thickness of the improved machines is optimised to reach optimal thrust force density. Finally, the performance of the DSSLFSPM-ST machines is analysed including the normal force, the efficiency and the power factor. It shows that the improved DSSLFSPM machines exhibit relatively low normal force and high thrust force density as well as low thrust ripples, indicating that they are suitable for long-stroke applications. 2 DSLFSPM machine topology and thrust force comparison 2.1 DSLFSPM machine topology One of the typical LFSPM machine topologies which is often investigated is the 12/14 mover/stator pole LFSPM machine where

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“…Double stator LFSMs can be further categorized as: (a) with yoke [16,17], and (b) without yoke [18,19]. Depending upon the excitation source, DSLFSMs can be divided into: (a) double sided linear flux switching permanent magnet machines (DSLFSPMMs) [20], (b) field excited DSLFSMs (FEDSLFSMs) [21], and (c) hybrid excited DSLFSMs (HEDSLFSMs) [22]. HEDSLFSMs utilize both PMs and field windings as excitation sources.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Capabilities of Double Sided Linear Flux Switching Permanent Magnet Machines

et al. 2018

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Double sided linear flux switching permanent magnet machines (DSLFSPMMs) exhibit high thrust force density, high efficiency, low cost and robust double salient secondary (stator) structures. The aforementioned unique features make DSLFSPMM suitable for long stroke applications. However, distorted flux linkage waveforms and high detent forces can exaggerate thrust force ripples and reduce their applicability in many areas. In order to enhance thrust force performance, reduce thrust force ripple ratio and total harmonic distortion (THD) of no-load flux linkages, two structure-based advancements are introduced in this work, i.e., asynchronous mover slot and stator tooth displacement technique (AMSSTDT) and the addition of an active permanent magnet end slot (APMES). Furthermore, single variable geometric optimization (SVGO) is carried out by the finite element method (FEM).

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Study of Two Kinds of Double-Sided Yokeless Linear Flux-Switching Permanent Magnet Machines

Cited by 7 publications

References 21 publications

Performance comparison and optimisation of dual mover linear permanent magnet flux switching machine

Performance comparison and optimisation of dual mover linear permanent magnet flux switching machine

Analysis of double‐sided sandwiched linear flux‐switching permanent‐magnet machines with staggered stator teeth for urban rail transit

Enhancing Capabilities of Double Sided Linear Flux Switching Permanent Magnet Machines

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