A Novel Dual-Stator Hybrid Excited Permanent Magnet Vernier Machine With Halbach-Array PMs

Wei, Liangliang; Nakamura, Taketsune

doi:10.1109/tmag.2020.3012193

Cited by 31 publications

(19 citation statements)

References 17 publications

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“…This topology is further improved by having separate slots for the field windings. In this case, the field windings are either placed in the FMT slots [54], [55] as shown in FIGURE 8(b) or in a separate stator with a dual airgap structure [56]. However, the field windings have been used in continuous operation and thus generate a significant copper loss.…”

Section: Hybrid Excited Pm-v (Hepm-v) Machinesmentioning

confidence: 99%

Permanent Magnet Vernier Machines for Direct-Drive Offshore Wind Power: Benefits and Challenges

Padinharu

Zhu

et al. 2022

IEEE Access

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Permanent magnet Vernier (PM-V) machines, at low power levels (few kWs), have shown a great potential to improve the torque density of existing direct-drive PM machines without much compromising on efficiency or making the machine structure more complicated. An improved torque density is very desirable for offshore wind power applications where the size of the direct-drive machine is an increasing concern. However, the relatively poor power factors of the PM-V machines will increase the power converter rating and hence cost. The objective of this paper is to review the benefits and challenges of PM-V machines for direct-drive offshore wind power applications. The review has been presented considering the system-level (direct-drive generator + converter) performance comparison between the surface-mounted permanent magnet Vernier (SPM-V) machines and the conventional SPM machines. It includes the indepth discussion on the challenges facing the PM-V machines when they are scaled up for multi-MW offshore wind power application. Other PM-V topologies discussed in literature have also been reviewed to asses their suitability for offshore wind power application.

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Section: Hybrid Excited Pm-v (Hepm-v) Machinesmentioning

confidence: 99%

Permanent Magnet Vernier Machines for Direct-Drive Offshore Wind Power: Benefits and Challenges

Padinharu

Zhu

et al. 2022

IEEE Access

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“…To further improve the flux linkage between the stators and rotor, the authors of [17] presented PMVMs with Halbach-array magnet in slot opening and consequent poles in the rotor with the claim to improve the torque density by 55%. Recently, another novel topology of dual airgap PMVM with Halbach-array magnets in the rotor was presented in [18] for a 43% improvement in torque as compared to the conventional PMVM. Moreover, a dual rotor PMVM was introduced with 50% higher torque than the single airgap PMVM [2].…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of a Dual Airgap Radial Flux Permanent Magnet Vernier Machine with Yokeless Rotor

Siddiqi

Yazdan

et al. 2021

Energies

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This paper presents a novel topology of dual airgap radial flux permanent magnet vernier machine (PMVM) in order to obtain a higher torque per magnet volume and similar average torque compared to a conventional PMVM machine. The proposed machine contains two stators and a sandwiched yokeless rotor. The yokeless rotor helps to reduce the magnet volume by providing an effective flux linkage in the stator windings. This effective flux linkage improved the average torque of the proposed machine. The competitiveness of the proposed vernier machine was validated using 2D finite element analysis under the same machine volume as that of conventional vernier machine. Moreover, cogging torque, torque ripples, torque density, losses, and efficiency performances also favored the proposed topology.

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“…It is well-known that air gap stores most of the energy, and thus, the dual-stator (DS) structure can be adopted to further increase the torque density. The effective space utilization with dual air gap on the outer and inner side of the rotor makes it possible to generate even more torque for a given volume [6][7][8]. A problem with DS machines is the complicated mechanical configuration of the rotor.…”

Section: Introductionmentioning

confidence: 99%

“…Tangential force Rotor surface area = 2 (8) where T, r, and are torque, outer radius of the rotor, and stack length, respectively. The tangential force is 436% higher than that of the PMM.…”

mentioning

confidence: 99%

Performance Characteristics of a Dual-Stator, Spoke-Type Permanent Magnet Vernier Machine with Support Bar

Park

Lukman

Kang³

et al. 2021

Energies

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Permanent magnet Vernier machine (PMVM) is a strong candidate for direct-drive applications in low-speed region because its power characteristic is higher than conventional permanent magnet machine (PMM). In this paper, the design of a dual-stator PMVM (DSPMVM) with spoke-type rotor is introduced. As a radial motor with dual-stator configuration, one on the outer and inner side, the rotor is equipped with support bars for practical and simple manufacturing, which is the aim of this study. The characteristics and performance of the proposed machine with and without the support bar are examined with finite element analysis (FEA). The DSPMVM and the support were manufactured and tested through experiments to verify proposed structure. Both simulation and experiment results show that there is little to no difference in performance when the support bar is equipped. Furthermore, the average deviation between simulation and experiment results is approximately 7% which is within the acceptable range.

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A Novel Dual-Stator Hybrid Excited Permanent Magnet Vernier Machine With Halbach-Array PMs

Cited by 31 publications

References 17 publications

Permanent Magnet Vernier Machines for Direct-Drive Offshore Wind Power: Benefits and Challenges

Permanent Magnet Vernier Machines for Direct-Drive Offshore Wind Power: Benefits and Challenges

Design and Analysis of a Dual Airgap Radial Flux Permanent Magnet Vernier Machine with Yokeless Rotor

Performance Characteristics of a Dual-Stator, Spoke-Type Permanent Magnet Vernier Machine with Support Bar

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