A Novel Triple-Permanent-Magnet-Excited Vernier Machine with Double-Stator Structure for Low-Speed and High-Torque Applications

Liu, Xinbo; Zhong, Xu; Du, Yi; Chen, Xun

doi:10.3390/en11071713

Cited by 5 publications

(4 citation statements)

References 23 publications

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“…Unlike brushless DC (BLDC) machines, which exhibit trapezoidal EMF voltage, PMSMs generate sinusoidal EMF voltage [4,5]. Additionally, sinusoidal-type PMSMs exhibit lower torque ripple compared to their trapezoidal-type counterparts [6].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Screen Effects on Torque Ripple and Efficiency of Dual Air-Gap Surface Permanent Magnet Synchronous Motor

Jeong,

Heidari,

Kang

et al. 2023

Energies

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Electric motors with a double air-gap structure offer increased power or torque density compared to their single air-gap counterparts, achievable through double-stator or double-rotor configurations. In a previous study, the authors proposed a double-stator permanent magnet synchronous motor (PMSM) with a magnetic screen placed in the middle of the rotor to isolate the outer and inner motors. However, the analysis of the magnetic screen was not provided in that study, as the design was arbitrarily chosen. This research focuses on the effects of the magnetic screen size and selects the appropriate dimensions for optimal motor performance. Finite element analysis (FEA) is employed to assess the electromagnetic characteristics of the screen. Subsequently, the motor is manufactured and tested. The results show that the chosen magnetic screen size contributes to significant efficiency improvements. In particular, the motor achieved an efficiency of 95.2% during the qualification test, surpassing the efficiency obtained in the previous study.

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Section: Introductionmentioning

confidence: 99%

Magnetic Screen Effects on Torque Ripple and Efficiency of Dual Air-Gap Surface Permanent Magnet Synchronous Motor

Jeong,

Heidari,

Kang

et al. 2023

Energies

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“…By increasing the energy stored in the air gap, more power can be converted, resulting in improved performance. The DS structure is an effective technique Machines 2023, 11, 717 2 of 13 for achieving this, as it allows for a more efficient distribution of the air-gap magnetic flux, resulting in higher torque density and lower torque ripples [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Characteristics of Dual-Air-Gap Surface Permanent Magnet Synchronous Motor

Jeong

Heidari

Kang³

et al. 2023

Machines

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This paper introduces a novel dual-air-gap surface permanent magnet synchronous motor (DAG-SPMSM) and investigates its electromagnetic characteristics. The motor comprises two stators (inner and outer) and a single rotor with permanent magnets on both sides (inner and outer). The magnets are arranged in a zig-zag configuration to isolate the inner and outer stator and rotor magnets. Additionally, a magnetic shield is incorporated into the rotor to further isolate the rotor magnetic flux, which results in a localized short flux path that can reduce core loss. The insertion of the magnetic shield also affects the flux path, reducing torque ripple. The electromagnetic characteristics, such as flux path, flux density, and torque, are analyzed using finite element analysis. The effectiveness of using a magnetic screen is also evaluated, and simple experiments are conducted to validate the observed characteristics of the proposed motor.

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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%

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 Triple-Permanent-Magnet-Excited Vernier Machine with Double-Stator Structure for Low-Speed and High-Torque Applications

Cited by 5 publications

References 23 publications

Magnetic Screen Effects on Torque Ripple and Efficiency of Dual Air-Gap Surface Permanent Magnet Synchronous Motor

Magnetic Screen Effects on Torque Ripple and Efficiency of Dual Air-Gap Surface Permanent Magnet Synchronous Motor

Electromagnetic Characteristics of Dual-Air-Gap Surface Permanent Magnet Synchronous Motor

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

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