Analytic power factor calculation for vernier machines with concentrated windings

Thyroff, Dominik; Hittinger, Christoph; Hahn, Ingo

doi:10.1109/iemdc.2017.8002009

Cited by 13 publications

(8 citation statements)

References 9 publications

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“…• novel FMP shapes: S-shape, concave-shape FMP [44,45] • non-uniform FMP: adjustable pitch ratio [46], (Fig. 9) • impact of FMP design on radial force: noise & vibration analyses [47,48] • SPM: radially-magnetised [49] or Halbach [ of concentrated-winding PMVM with different slot/pole combinations [45]. By adjusting the circumferential position of FMPs, the MMF harmonic spectrum can be regulated.…”

Section: Flux Modulation Poles (Fmps)mentioning

confidence: 99%

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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: Flux Modulation Poles (Fmps)mentioning

confidence: 99%

“…It has been shown that the rectangular shape is not the optimal shape for the FMP in a PMVM with the concentrated winding. In addition, a general analytical model has been developed to calculate the power factor of concentrated‐winding PMVM with different slot/pole combinations [45].…”

Section: Winding Flux Modulation Pole and Rotor Designmentioning

confidence: 99%

Permanent magnet vernier machine: a review

El-Refaie

2019

IET Electric Power Applications

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“…NI ratio = P cuf P cua (25) where P cuf and P cua are the copper losses of field and armature windings, respectively. A higher DC/AC winding ampere turns ratio will lead to a smaller flux ratio and higher-power factor.…”

Section: Dc/ac Winding Ampere Turns Ratiomentioning

confidence: 99%

“…In fact, many SWF and stator PM-excited machines, e.g. transverse flux PM machines [19][20][21][22], flux reversal machines [23], VRMs [24,25], flux-modulated PM machines [26,27], are reported to suffer from low-power factor issue at full load condition (<0.55). As another SWF machine, VFRMs may also have the same problem.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of power factor in variable flux reluctance machines with MMF‐permeance model

Huang

Feng

Guo

et al. 2019

IET Electric Power Applications

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This study investigates the underlying mechanism of low-power factor issue of variable flux reluctance machines (VFRMs) from the perspective of magneto-motive force (MMF)-permeance model. On the basis of a simplified analytical model, the relationship between the design parameters and the power factor is identified and systematically summarised into three predictable ratios: the rotor permeance ratio, stator/rotor-pole ratio and DC/AC winding ampere turns ratio. Specifically, the smaller the rotor-pole arc, the air-gap length, the rotor-pole number and the AC/DC winding ampere turns ratio are, the higher the power factor will be. In addition, the weak coupling between the field and armature windings caused by the modulation effect of the salient rotor is responsible for the low-power factor issue of VFRMs, regardless of the control scheme, winding configuration or saturation effect. A 6-stator-pole/4-rotor-pole VFRM is prototyped and tested for verification.

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