Design and Analysis of a Cost-Effective Magnetless Multiphase Flux-Reversal DC-Field Machine for Wind Power Generation

Lee, Christopher; Chau, K. T.; Liu, Chunhua

doi:10.1109/tec.2015.2443155

Cited by 45 publications

(23 citation statements)

References 26 publications

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“…According to (16), another limit on the optimization process is PM height, which is shown by h m−min ≤h m .…”

Section: Optimization Constraintsmentioning

confidence: 99%

“…The authors in [14] proposed using a flux barrier in the rotor and in [15] proposed the asymmetric stator pole to reduce the flux leakage. A magnetless FRM was first designed in [16], in which a four-phase DC field was used instead of PM for providing excitation control ability. An improved configuration was introduced in [17][18][19] for cogging torque reduction.…”

Section: Introductionmentioning

confidence: 99%

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Optimal design of a flux reversal permanent magnet machine as a wind turbinegenerator

Ghasemian¹,

Tahami²,

Nasiri‐Gheidari³

2020

Turk J Elec Eng & Comp Sci

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Flux reversal permanent magnet generators are well suited for use as wind turbine generators owing to their high torque generation ability and magnetic gear. However, they suffer from poor voltage regulation due to their high winding inductance. In this paper, a design optimization method is proposed for flux reversal generators in wind turbine applications. The proposed method includes a new multiobjective function. Cost, volume of the generator, and mass of the permanent magnet are considered in it independently and simultaneously. Besides the new objective function, the main superiority of this paper compared with published papers is considering winding inductance in optimization procedures as a constraint and analyzing the optimization results for different values of it. Also, for the first time, the equations for permanent magnet sizing are considered based on a demagnetization curve for designing a flux reversal generator. For this purpose, a step-by-step design procedure is proposed and sensitivity analysis is performed to determine the sensitivity of output parameters to specific electrical loading, the height of the permanent magnets, and the machine length-to-diameter ratio. Then a multiobjective optimization based on a genetic algorithm is carried out and the best combination of pole number and number of slots/pole/phase is obtained. Then, for this combination, the optimum value of the constraint is obtained, too. Then specifications and dimensions of the optimum flux reversal machine as a wind turbine generator is presented. Finally, a time-stepping finite element method is used to validate the design and optimization results.

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“…According to (16), another limit on the optimization process is PM height, which is shown by h m−min ≤h m .…”

Section: Optimization Constraintsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimal design of a flux reversal permanent magnet machine as a wind turbinegenerator

Ghasemian¹,

Tahami²,

Nasiri‐Gheidari³

2020

Turk J Elec Eng & Comp Sci

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show abstract

“…ERMANENT magnet (PM) machines have been widely used in domestic and industrial applications due to their excellent performance. However, with the increasing concerns about the cost, resource, and risk of demagnetization of PMs [1], many magnetless machines have been extensively investigated recently [2] [3].…”

Section: Introductionmentioning

confidence: 99%

Torque Density Enhancement of 6/4 Variable Flux Reluctance Machine With Second-Harmonic Current Injection

Feng

Huang

Zhu

et al. 2019

IEEE Trans. Energy Convers.

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Article:Feng, J., Huang, L., Zhu, Z.Q. orcid.org/0000-0001-7175-3307 et al. (2 more authors) (2019) Torque density enhancement of 6/4 variable flux reluctance machine with 2nd harmonic current injection. IEEE Transactions on Energy Conversion, 34 (2). pp.Abstract-Variable flux reluctance machines (VFRMs) are developed as magnetless electrical machines. To extend the application of VFRMs, the enhancement of torque density is a key during machine design. In this paper, a novel 2 nd harmonic current injection method is developed for torque density enhancement for 6-stator-slot/4-rotor-tooth (6/4) VFRM. By using the analytical method, the optimal current profile with injected 2 nd harmonic current is obtained. The average torque of 6/4 VFRM is improved by 20% with the proposed method under all load conditions. Moreover, the proposed current profile has fixed harmonic proportions and is easily applicable to machines with different specifications. All the conclusions are confirmed by both finite element analyses and experimental results.Index Terms-Harmonic current injection method, reluctance machine, torque density. J.H. Feng (S'06) received his B.S. and M.S.

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“…The modulation of the salient rotor to the static open-circuit PM field and the rotating armature reaction field makes them synchronous to each other in the air-gap, generating average electromagnetic torque [8]. There are three types of stator-PM machines, including doubly salient PM (DSPM) machines having yoke-inserted PMs [30], [31], switched flux PM (SFPM) machines having toothsandwiched PMs [32]- [39] and flux reversal PM (FRPM) machines having tooth-surface-mounted PMs [40]- [42]. Compared with the DSPM and SFPM machines, the FRPM machines have an integral stator lamination, which is better for manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Partitioned Stator Flux Reversal PM Machine and Magnetically Geared Machine Operating in Stator-PM and Rotor-PM Modes

Zhu

Zhan

2017

IEEE Trans. Energy Convers.

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A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP URL' above for details on accessing the published version and note that access may require a subscription.For more information, please contact the WRAP Team at: wrap@warwick.ac.uk 1Abstract-In this paper, the partitioned stator flux reversal permanent magnet (PM) (PS-FRPM) machine and the conventional magnetically geared (MG) machine operating in both stator-PM (SPM) and rotor-PM (RPM) modes are comparatively analyzed in terms of electromagnetic performance to provide design guides for a MG machine regarding: (a) a SPM or RPM type machine and (b) a higher or lower gear ratio machine. It is found that a SPM type machine is recommended, since both PS-FRPM and MG machines operating in SPM modes have a higher phase back-EMF and hence torque than their RPM counterparts, respectively, as a result of a similar phase flux-linkage but a higher electric frequency since the iron piece number is larger than the PM pole-pair number. Moreover, a smaller gear ratio machine is preferred from the perspective of a higher power factor and hence a lower inverter power rating, as the conventional MG machines with higher gear ratios suffer from larger fluxleakage, higher synchronous reactance and hence lower power factors, as well as higher iron losses, than the PS-FRPM machines. However, higher gear ratio machines feature lower cogging torques and torque ripples due to the smaller difference between the PM pole-pair number and iron piece number. Both prototypes of PS-FRPM machine operating in SPM mode and MG machine operating in RPM mode are built and tested to verify the FE predicted results.Index Terms-Flux modulated machine, flux reversal, magnetically geared (MG) machine, partitioned stator, permanent magnet (PM), power factor, rotor-permanent magnet, stator-permanent magnet.

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Design and Analysis of a Cost-Effective Magnetless Multiphase Flux-Reversal DC-Field Machine for Wind Power Generation

Cited by 45 publications

References 26 publications

Optimal design of a flux reversal permanent magnet machine as a wind turbinegenerator

Optimal design of a flux reversal permanent magnet machine as a wind turbinegenerator

Torque Density Enhancement of 6/4 Variable Flux Reluctance Machine With Second-Harmonic Current Injection

Comparative Analysis of Partitioned Stator Flux Reversal PM Machine and Magnetically Geared Machine Operating in Stator-PM and Rotor-PM Modes

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