Advanced High Torque Density PM Vernier Machine With Multiple Working Harmonics

Zou, Tianjie; Li, Dawei; Qu, Ronghai; Jiang, Dong; Li, Jian

doi:10.1109/tia.2017.2724505

Cited by 146 publications

(52 citation statements)

References 22 publications

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“…The back-EMF is more sinusoidal than the other PM machines due to the large rotor poles, few slots, and harmonic couple effects [3]. The magnitude of the fundamental of average torque and the induced voltage is increased by the flux-concentrating structure located on the rotor [27]. If the leakage flux leads to great reduction in the back-EMF, the idea would be justifiable [3].…”

Section: The Back-emfmentioning

confidence: 99%

“…Fractional-slot concentrated-winding PMVMs are becoming attractive in many applications due to winding harmonic reduction [8]. Since the split-pole PMVM is first presented, researches on novel topologies focus on concentrated winding in [8] and high-torque-density PM Vernier machine with multiple working harmonics in [9]. Wolfgang Gruber, Richard Remplbauer, Elisabeth, and Gubel designed new bearingless PMV slice motor with external rotor [10].…”

Section: Introductionmentioning

confidence: 99%

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A quantitative comparison among different types of auxiliary slot, auxiliary tooth, and the slot opening in split-pole Vernier machine

Alavijeh

Shamlou

2020

Electr Eng

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The Vernier permanent magnet machine is a high-torque, low-speed system suitable for direct-drive applications such as in-wheel electrical machines and wind generation turbines. In this paper, specific critical parameters of the electrical machine for auxiliary tooth and slot are investigated in different conditions. It should be noted that all the models are fully optimized and compared under the same condition by FEA analysis. The results illustrate that the stator with α β θ is the best choice for stator split pole. Also, the concentrated winding is wound around the main stator tooth and the magnets mounted on the rotor surface. Besides, all essential characteristics for an electric machine such as torque, cogging torque, power factor, and efficiency are investigated. Furthermore, many basic formulas for designing a Vernier machine are proposed. This comparison helps designers choose the best combination among α, β, and θ in the split-pole structures. There is a nomenclature to organize this manuscript for the reader. It should be noted that all the figures are baked by ANSYS Electronics Maxwell version 19.0. Moreover, all of them are modified by Origin software to show with high quality.

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Section: The Back-emfmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A quantitative comparison among different types of auxiliary slot, auxiliary tooth, and the slot opening in split-pole Vernier machine

Alavijeh

Shamlou

2020

Electr Eng

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“…The fundamental‐phase back‐electromotive force (back‐EMF) of the proposed machine has a relationship with the HSR speed Ω H directly, which can be expressed as

e_{ph} = 2 Ω_{H} R_{g_VM} L_{stk} N_{ph} B_{g_VM} k_{w} \sin (2 π f_{e} t - θ_{ph})

where R g_VM is the air‐gap radius adjacent to the inside of HSR, L stk is the axial length, N ph is the turns in series per phase, B g_VM is amplitude of fundamental air‐gap flux density adjacent to the inside of HSR, k w is the fundamental winding factor, θ ph is the initial angular position of each phase, and f e is the fundamental frequency of the back‐EMF. The synchronous speed produced by the armature windings is n e = 60 f e / P e , the HSR speed is n H = 60 f e /( G VM P e ), and the LSR speed is n L = 60 f e /( G r P e ).…”

Section: Machine Configuration and Operation Principlementioning

confidence: 99%

Design and analysis of a two‐stage transmission magnetic‐geared machine

Jin

Zhang

2019

IEEJ Transactions Elec Engng

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The purpose of this paper is to realize a two-stage transmission magnetic-geared (2-STMG) machine with high gear ratio. The proposed machine contains a concentric magnetic gear (CMG) and a Vernier machine (VM). Both the components meet the magnetic gearing effect and share a common high-speed rotor (HSR). The VM is the first stage, and the CMG is the second stage. The designed gear ratio of the proposed 2-STMG is 34. The magnetic flux is partially coupled to the HSR yoke. The cogging torque on the HSR is slightly higher than that on the low-speed rotor (LSR). A method is presented to detect the gear ratio of magnetic geared machines with the back-electromotive force (back-EMF). And the evaluated gear ratio of the prototype is found to be close to the design value. The amplitude of the fundamental back-EMF is nearly linear with the LSR speed, and the slope of the fitting curve is ∼0.16 V/rpm. The peak static torques on both rotors are positively correlated with the DC currents applied to windings but limited by saturation when current is larger than 4A. The 2-STMG machine is controllable, and the speed ratio of HSR to LSR is close to the gear ratio of the outer CMG.

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“…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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Advanced High Torque Density PM Vernier Machine With Multiple Working Harmonics

Cited by 146 publications

References 22 publications

A quantitative comparison among different types of auxiliary slot, auxiliary tooth, and the slot opening in split-pole Vernier machine

A quantitative comparison among different types of auxiliary slot, auxiliary tooth, and the slot opening in split-pole Vernier machine

Design and analysis of a two‐stage transmission magnetic‐geared machine

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

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