A Novel Permanent Magnet Vernier Machine With Halbach Array Magnets in Stator Slot Opening

Xie, Kangfu; Li, Dawei; Qu, Ronghai; Gao, Yuting

doi:10.1109/tmag.2017.2658634

Cited by 115 publications

(39 citation statements)

References 7 publications

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“…13). This has been reported in both linear and rotary PMVMs [65][66][67], in which the Halbach PM array helps in intensifying the main flux path as well as reducing slot leakage flux while the consequent-pole rotor introduces a doubly-salient structure. Therefore, either the stator teeth or the rotor poles can be modulation poles.…”

Section: Evolution Of Topologiesmentioning

confidence: 82%

Permanent magnet vernier machine: a review

El-Refaie

2019

IET Electric Power Applications

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Permanent magnet vernier machines (PMVMs) gained a lot of interest over the past couple of decades. This is mainly due to their high torque density enabled by the magnetic gearing effect. This study will provide a thorough review of recent advances in PMVMs. This review will cover the principle of operation and nature of magnetic gearing in PMVMs, and a better understanding of novel PMVM topologies using different winding configuration as well as different modulation poles and rotor structures. Detailed discussions on the choice of gear ratio, slot-pole combinations, design optimisation and role of advanced materials in PMVMs will be presented. This will provide an update on the current state-of-the art as well as future areas of research. Furthermore, the power factor issue, fault tolerance as well as cost reduction will be discussed highlighting the gap between the current state-of-the art and what is needed in practical applications.

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Section: Evolution Of Topologiesmentioning

confidence: 82%

Permanent magnet vernier machine: a review

El-Refaie

2019

IET Electric Power Applications

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“…9. Ampere's circuital law is applied to these three loops to Applying Ampere's circuital law, the fluxes in the three loops can be calculated as (see Appendix 1 for more detailed derivations) ( where is the electrical loading, is the phase number, is the stator slot height, is the stator slot opening and is the effective airgap length, is the Carter's coefficient given by [20], [30] A- It is worth noting here that the magnitudes of fluxes flowing in Loop1 and Loop2 are the same [see (12) and (13)]. For validating the armature flux calculation, total flux linking with the phase C is estimated directly by FEA by doubling the flux extracted from contour [marked in yellow dotted line in Fig.…”

Section: Armature Flux Calculationmentioning

confidence: 99%

Investigation of scaling effect on power factor of permanent magnet Vernier machines for wind power application

Padinharu

Zhu

et al. 2020

IET Electric Power Applications

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This paper investigates the scaling effect on power factor of surface mounted permanent magnet Vernier (SPM-V) machines with power ratings ranging from 3kW, 500kW, 3MW to 10MW. For each power rating, different slot/pole number combinations have been considered to study the influence of key parameters including inter-pole magnet leakage and stator slot leakage on power factor. A detailed analytical modelling, incorporating these key parameters, is presented and validated with 2D Finite Element Analysis (FEA) for different power ratings and slot/pole number combinations. The study has revealed that with scaling (increasing power level), significant increase in electrical loading combined with the increased leakage fluxes, i.e. (a) magnet leakage flux due to large coil pitch to rotor pole pitch ratio, (b) magnet inter-pole leakage flux and (c) stator slot leakage flux, reduces the ratio of armature flux linkage to PM flux linkage and thereby has a detrimental effect on the power factor. Therefore, unlike conventional SPM machines, the power factor of SPM-V machines is found to be significantly reduced at high power ratings.

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“…Only these magnetic field components contribute in the developed torque and induced back-EMF. (13) where Γ 1 is the fundamental component of the PMs MMF distribution, i.e. 4 , /π.…”

Section: Generic Analysis Of Cp-vpm Machinementioning

confidence: 99%

“…Several studies on the modeling, design, fabrication, geometrical optimization and presenting new structures of radial flux, axial flux and linear VPM machines have been reported, e.g. [8][9][10][11][12][13][14]. However, the operating principles of the CP-VPM machine and comparison of its performance with other VPM structures are not discussed in the previous publications.…”

Section: Introductionmentioning

confidence: 99%

Design Modifications for Improving Modulation Flux Capability of Consequent-Pole Vernier-PM Machine in Comparison to Conventional Vernier-PM Machines

Gorginpour

2019

Scientia Iranica

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The Vernier PM (VPM) machine is known as a high-torque and low speed drive solution suitable for direct-drive applications such as electric vehicles and wind turbines. The Consequent-Pole Vernier PM (CP-VPM) machine is a special structure of VPM that also introduces high torque density as the conventional VPM incorporating significantly lower volume of PM materials. Although many researches and experiment studies, especially in recent years, reported concerning the conventional structure, there are little publications on the CP-VPM machine. The paper presents the electromagnetic principles of modulation flux occurring in CP-VPM machine. The operating quantities are evaluated using analytical equations and compared with the conventional machine performance. It is concluded that the torque density and back-EMF are much larger than the conventional machine and the torque pulsation magnitude is lower. However, the power-factor is undesirably reduced due to higher spatial harmonics distortion of the CP rotor magnetic field and presence of magnetic field components that do not contribute in the flux modulation. Based on the spatial harmonic analysis, design modifications for enhancing the operational characteristics of the CP-VPM machine are proposed and their effectiveness is verified through comparing the 2D-FE results with the results of the conventional VPM machines.

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A Novel Permanent Magnet Vernier Machine With Halbach Array Magnets in Stator Slot Opening

Cited by 115 publications

References 7 publications

Permanent magnet vernier machine: a review

Permanent magnet vernier machine: a review

Investigation of scaling effect on power factor of permanent magnet Vernier machines for wind power application

Design Modifications for Improving Modulation Flux Capability of Consequent-Pole Vernier-PM Machine in Comparison to Conventional Vernier-PM Machines

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