A linear consequent pole stator permanent magnet vernier machine

Liu, Xianxing; Zou, Changpeng; Du, Yi

doi:10.1109/icems.2014.7013778

Cited by 17 publications

(11 citation statements)

References 13 publications

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“…Furthermore, very low thrust ripple values can also be achieved with LVPMs [158], [160], [167], [176]. Contrary to other machines, LVPMs can achieve low speeds and still maintain a reasonable size and number of primary slots [157], [168], [172], which simplifies its structure.…”

Section: Vernier Machinesmentioning

confidence: 99%

“…The optimal shape of PMs for the same type of machine is discussed in [172]. Another consequent pole structure is proposed in [157] to reduce the volume of PMs. Not only does the proposed machine reduce 25 % of the PM volume, but also the thrust capability of the consequent pole machine is 34 % higher than the one from the original machine.…”

Section: Vernier Machinesmentioning

confidence: 99%

“…Consequent-pole machines (Fig. 14 (b)) are capable of improving the thrust density of LPMSMs [129], [142], [157], [161], [162]. This is achieved because, due to their structure the flux leakage is reduced [157], [161], [162], [174].…”

Section: A Thrust Force Densitymentioning

confidence: 99%

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Linear Machines for Long Stroke Applications—A Review

et al. 2020

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This document reviews the current state of the art in the linear machine technology. First, the recent advancements in linear induction, switched reluctance and permanent magnet machines are presented. The ladder slit secondary configuration is identified as an interesting configuration for linear induction machines. In the case of switched reluctance machines, the mutually-coupled configuration has been found to equate the thrust capability of conventional permanent magnet machines. The capabilities of the so called linear primary permanent magnet, viz. switched-flux, flux-reversal, doubly-salient and vernier machines are presented afterwards. A guide of different options to enhance several characteristics of linear machines is also listed. A qualitative comparison of the capabilities of linear primary permanent magnet machines is given later, where linear vernier and switched-flux machines are identified as the most interesting configurations for long stroke applications. In order to demonstrate the validity of the presented comparison, three machines are selected from the literature, and their capabilities are compared under the same conditions to a conventional linear permanent magnet machine. It is found that the flux-reversal machines suffer from a very poor power factor, whereas the thrust capability of both vernier and switched-flux machines is confirmed. However, the overload capability of these machines is found to be substantially lower than the one from the conventional machine. Finally, some different research topics are identified and suggested for each type of machine.

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Section: Vernier Machinesmentioning

confidence: 99%

Section: Vernier Machinesmentioning

confidence: 99%

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Linear Machines for Long Stroke Applications—A Review

et al. 2020

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“…In consequent pole machines, higher MMF can be produced by making the magnet pitch larger than the consequent pole pitch [23,24]. In this study, therefore, in order to allow more room for V-shape PM arrays the magnet pole span is designed to be bigger than the consequent pole span as shown in Fig.…”

Section: Vcp Machinementioning

confidence: 99%

Design and Analysis of a Flux-Concentrated Linear Vernier Hybrid Machine With Consequent Poles

Almoraya

Baker

Smith

et al. 2019

IEEE Trans. on Ind. Applicat.

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 Abstract --In low speed applications, variable reluctance permanent magnet machines are often proposed due to their efficient use of magnet material and high torque density. This becomes even more important in large linear applications, where the translator is longer than the stator. Often, however, very low power factors are experienced by this class of machine. This paper proposes a V-shape flux concentrated version of a consequent pole linear Vernier hybrid permanent magnet machine and compares it to a surface mounted magnet variant. Using finite element analysis validated by two laboratory prototypes, it is shown that the flux concentrated version increases the airgap flux density, which potentially leads to an improvement in the force density and efficiency, or can be used to increase the operating power factor.Index Terms--consequent pole, V-shape, Vernier machine, power factor, linear machine, leakage flux.

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“…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.…”

mentioning

confidence: 99%

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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A linear consequent pole stator permanent magnet vernier machine

Cited by 17 publications

References 13 publications

Linear Machines for Long Stroke Applications—A Review

Linear Machines for Long Stroke Applications—A Review

Design and Analysis of a Flux-Concentrated Linear Vernier Hybrid Machine With Consequent Poles

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

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