Force Ripple and Cogging Force Minimisation Criteria of Single-Sided Consequent-Pole Linear Vernier Hybrid Machines

Botha, C.D.; Kamper, Maarten J.; Wang, Rong‐Jie; Sorgdrager, A. J.

doi:10.1109/icem49940.2020.9270845

Cited by 7 publications

(7 citation statements)

References 10 publications

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“…Since the higherorder field harmonics are mainly the source of pulsating flux and force, this indicates that the cogging and ripple forces of the CP LHVM would be greater than those of the SM LHVM. As discussed in the literature [7], [9], [18], [19], some techniques such as tapering the consequent-poles and translator teeth, are normally applied to reduce the flux leakage, mitigate the cogging/ripple forces, and provide a more sinusoidal induced EMF for CP LVHMs.…”

Section: Comparison Of the Sm And Cp Lvhmmentioning

confidence: 99%

“…To improve magnet utilisation and machine performance, the consequent pole (CP) technique, in which either the north or south pole magnets are replaced by soft ferromagnetic poles, can be used [1], [3], [4]. The CP technique has been studied in the literature for Vernier machines [1], [5]- [9] and flux-reversal machines (FRM) [2]- [4], [10]- [12]. While most of the research has focused on the working principle and optimal design solutions of CP machines, some research work has attempted to explain the potential advantages of the CP structure.…”

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confidence: 99%

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Analytical Modeling of Surface-Mounted and Consequent-Pole Linear Vernier Hybrid Machines

et al. 2021

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This paper presents an analytical method for modelling the no-load air gap flux density of a surface-mounted and a consequent-pole linear Vernier hybrid machine (LVHM). The approach is based on simple magneto-motive force (MMF) and permeance functions to account for the doubly-slotted air gap of the LVHM. These models are used to determine the flux linkage, induced electromotive force (EMF) and average thrust force of each machine. The accuracy of the two analytical models is validated by comparison with 2D finite element method (FEM) solutions. Based on the analytical models, it is found that the working harmonics of both surface-mounted and consequent-pole LVHMs are essentially the same. However, the magnitudes of these working harmonics in the consequent-pole LVHM are invariably greater than those of surface-mounted LVHM. Further, using the analytical model, the contribution to the thrust force of the machine by each individual working harmonic can be shown clearly, and is used to explain why the consequent-pole LVHM has improved performance despite using only 50% of the permanent magnet (PM) material compared to the surface-mounted LVHM.

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Section: Comparison Of the Sm And Cp Lvhmmentioning

confidence: 99%

mentioning

confidence: 99%

Analytical Modeling of Surface-Mounted and Consequent-Pole Linear Vernier Hybrid Machines

et al. 2021

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“…Hence, the inductance variations with translator position in the proposed LDSFRPMM may give increase to fluctuating force. For both models, the thrust force can be given by Botha et al [31]:…”

Section: Thrust Force and Detent Forcementioning

confidence: 99%

Analysis of a New Linear Dual Stator Consequent Pole Halbach Array Flux Reversal Machine

2021

IJE

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The permanent magnet machine has attracted much attention due to its high torque density at low speed and simple configuration. This feature is due to many magnetic pole pairs that flux in the air gap can be significantly changed with the smallest motion of the moving. In this paper, a linear dual stator flux reversal permanent magnet machine (LDSFRPMM) with toroidal winding is presented, which magnets embedded with Halbach and simple array on the translator and stator, respectively. The innovation of this structure over a conventional machine is the addition of a magnet between the stator teeth with the appropriate magnetic orientation,and finding the best width of permanent magnet on the stator and a change of the type of winding from the concentrated to the toroidal. By implementing these changes on a conventional machine, the main parameters of the machine such as back electromotive force (EMF), thrust force, power factor and permanent magnetic (PM) flux are increased which improves the performance of the proposed machine.

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“…Another study adds assistant teeth and notes the different magnitudes in phase voltages for windings closer to the stator ends [15]. For a linear Vernier hybrid machine, the force ripple and cogging have been minimized by optimizing the consequent poles, translator poles, and PM width [16]. The study most similar to this paper studied surface-mounted PMs where the length of the end teeth are changed to reduce the end forces, where the end forces are calculated using inductance formulations derived from a frozen permeability technique [17].…”

Section: Introductionmentioning

confidence: 99%

“…The study by Yao et al [17], however, has a greater focus on the skewing effects of the linear machine. Most end force optimization studies on linear electrical machines are done for surface-mounted PMs [3,14,16,17].…”

Section: Introductionmentioning

confidence: 99%

End Effects and Geometric Compensation in Linear Permanent Magnet Synchronous Generators with Different Topologies

Sjölund

Frost

Leijon

et al. 2021

Designs

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Electricity production from ocean waves with different solutions is a topic of major research interest. Many of such designs are based on linear generators that inherently introduce end forces. In this paper, detent force using Maxwell Stress Tensor and induced voltage is initially investigated for two different winding patterns for a generator topology with buried magnets in a finite element software. Two ways of overcoming the end forces are further examined: the first method reduces the magnetic flux variations of the translator between stator and air. The second method aims at countering the end forces at both ends for full active stator area. A comparison is then made between buried and surface-mounted topologies for the second end effect compensation method. Both no-load and load conditions are investigated in the comparison. The end effect compensation shows promising results for both topologies. Some clear similarities of the extended stator used to counter the end forces are also apparent, where the stator extensions completely cover the outer poles of both topologies. The results also indicate a longer full active stator area for the buried topology for the same pole-pitch and stroke length, resulting in a higher average voltage for partial stator overlap.

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Force Ripple and Cogging Force Minimisation Criteria of Single-Sided Consequent-Pole Linear Vernier Hybrid Machines

Cited by 7 publications

References 10 publications

Analytical Modeling of Surface-Mounted and Consequent-Pole Linear Vernier Hybrid Machines

Analytical Modeling of Surface-Mounted and Consequent-Pole Linear Vernier Hybrid Machines

Analysis of a New Linear Dual Stator Consequent Pole Halbach Array Flux Reversal Machine

End Effects and Geometric Compensation in Linear Permanent Magnet Synchronous Generators with Different Topologies

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