Design Optimization of a Double-Sided Hybrid Excited Linear Flux Switching PM Motor With Low Force Ripple

Liu, Cheng-Tsung; Hwang, Chang-Chou; Li, Ping-Lun; Hung, San-Shan; Wendling, P.

doi:10.1109/tmag.2014.2322630

Cited by 45 publications

(20 citation statements)

References 13 publications

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“…PMLFSM reveals drawbacks of uncontrollable air-gap magnetic flux density and risk of PM demagnetization. Furthermore, continuous and rapid increase in rare-earth PM materials prices such as Neodymium, Dysprosium, and Terbium increased manufacturing cost of PMLFSM [20]. Alternatively, DC electromagnets can be utilized to replace PMs and aforementioned PMLFSM's drawbacks can be curtailed with an additional advantage of flux strengthening/weakening capability.…”

Section: Introductionmentioning

confidence: 99%

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Analytical Airgap Field Model and Experimental Validation of Double Sided Hybrid Excited Linear Flux Switching Machine

et al. 2021

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Linear Flux Switching Machines (LFSMs) are suitable candidates for long stroke applications as they confines all excitation sources to primary thus leaving completely passive, robust, and low cost secondary. Permanent Magnet LFSMs (PMLFSMs) enables high thrust force density and efficiency. However, deficiency of controllable air-gap flux, risk of PM demagnetization, and increasing cost of rare earth PM materials diverted researchers towards Field Excited LFSMs (FELFSMs). FELFSMs wiped out aforementioned PMLFSM's shortcomings at the cost of low thrust force density. In this paper, merits of PMLFSM and FELFSM are combined by proposing a novel Hybrid Excited LFSM (HELFSM). Proposed machine is excited by PMs, Field Excitation Coils (FECs), and Armature Windings (AWs). However, complex magnetic circuit of poly-excited HELFSM compels designers to adopt FE Analysis (FEA) for design, analysis, and optimization. To decrease dependency on computationally complex and time consuming FEA, an analytical model combining lumped parameter magnetic equivalent circuit, Fourier analysis, Laplace equation, and Maxwell Stress Tensor method is proposed to predict open-circuit flux linkage, B-EMF, normal and tangential components of no-load and on-load magnetic flux density, detent, and thrust force performance. Finally, predictions of the developed analytical model are validated with corresponding FEA and experimental results.INDEX TERMS Analytical modeling, finite element analysis, hybrid excited linear flux switching machine, lumped parameter magnetic equivalent circuits, maxwell stress tensor, segmented secondary.

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Section: Introductionmentioning

confidence: 99%

“…HELFSM is totally a new dimension combining advantages of both PMLFSM and FELFSM by utilizing PMs, FECs, and Armature Windings (AWs) as excitation sources. However, literature regarding HELFSM [20] is very scarce and requires serious attention.…”

Section: Introductionmentioning

confidence: 99%

Analytical Airgap Field Model and Experimental Validation of Double Sided Hybrid Excited Linear Flux Switching Machine

et al. 2021

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“…However, the field excited LFSM exhibits low thrust force density when compared with PM machines. Although the literature about HEDSLFSMs is very limited, a genetic algorithm (GA) optimization approach is utilized in [31] to reduce the thrust force ripple ratio while maintaining the average thrust force of a HEDSLFSM. Numerous advanced optimization techniques utilized for electric machines are presented in [32].…”

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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“…As linear motors, FSPMLM and PMLSM both suffer from detent force, so some methods to reduce detent force used in PMLSM can also be used in FSPMLM. The existing methods can be classified into two types: one is the control strategies of machines [10][11][12][13][14], and the other is the optimization of the machine structure [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30].…”

mentioning

confidence: 99%

“…The detent force caused by the end effect in FSPMLM can be reduced by adjusting the position of end teeth [20]. [21] comparatively researches the effects of two different types end teeth in a double-sided hybrid excited FSPMLM on thrust ripple. [22] shows that there is little difference between individual parameter optimization and genetic algorithm in optimizing FSPMLM, and the detent force can be reduced by adjusting the position and width of end teeth.…”

mentioning

confidence: 99%

Reduction of the Detent Force in a Flux-Switching Permanent Magnet Linear Motor

Zhao

Mou

Guo

et al. 2019

IEEE Trans. Energy Convers.

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In this paper, the detent force caused by the end effect in a flux-switching permanent magnet linear motor (FSPMLM) with 6 slots and 5 poles is investigated and reduced by two different methods. Firstly, the detent force is diminished by adjusting the position of end teeth of primary side and injecting compensation current into compensation windings wound around the end teeth. Based on the linear relationship between compensation current and compensation force, the proper compensation current is derived and analyzed. Then, to avoid the magnetic coupling between compensation windings and phase windings, a novel compensation module with independent magnet circuit is presented and attached to the primary side of FSPMLM. Thirdly, the two detent force reduction methods are compared with each other, and the compensation module is proved to be more effective. Finally, a prototype of FSPMLM with compensation modules is manufactured and tested to validate the proposed compensation method. Index Terms-Flux-switching linear permanent magnet motor (FSPMLM), detent force, compensation coil, compensation module. I. INTRODUCTIONINEAR MOTORS possess several advantages such as rapid dynamic response, high precision, excellent reliability and quiet operation. Therefore, this kind of motor is greatly required in the occasions where linear motion is needed, such as rail transit, ropeless elevator, and electromagnetic launch [1][2][3][4][5]. However, for the applications demanding extremely long secondary, such as rail transit and ropeless elevator, the conventional permanent magnet linear synchronous motor (PMLSM) is inappropriate, because large amount of expensive permanent magnets or copper windings are indispensable. Flux-switching linear permanent magnet motor (FSPMLM) is more appropriate for the long secondary occasions, because its permanent magnets and windings are all installed in the primary side. Its secondary side only consists Manuscript

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Design Optimization of a Double-Sided Hybrid Excited Linear Flux Switching PM Motor With Low Force Ripple

Cited by 45 publications

References 13 publications

Analytical Airgap Field Model and Experimental Validation of Double Sided Hybrid Excited Linear Flux Switching Machine

Analytical Airgap Field Model and Experimental Validation of Double Sided Hybrid Excited Linear Flux Switching Machine

Enhancing Capabilities of Double Sided Linear Flux Switching Permanent Magnet Machines

Reduction of the Detent Force in a Flux-Switching Permanent Magnet Linear Motor

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