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A high-performance dual-stator permanent-magnet vernier machine for propulsion applications

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Abstract

This paper proposes two structures of dual-stator permanent-magnet vernier machines (VMs) for high-torque low-speed applications. The proposed structures consist of dual-sided rotor which is sandwiched by inner and outer stators. These topologies include 22 and 46 consequent-pole magnets in the rotor and 24 and 48 stator slots for Design A and Design B, respectively. Design A is an improved structure of dual stator VM and Design B is a novel topology of a dual stator VM that can deliver considerably higher back-EMF and torque than Design A. The only drawback in Design B is lower power factor. The characteristics and performance parameters of the proposed VMs are evaluated using FEA. Sensitivity analysis is used to figure out the optimum dimensions of the magnets. In fact, two combinations of slot/pole number of the vernier machines are investigated as Design A and Design B. The capabilities of the proposed vernier machines are presented in a fair comparison with other VMs namely as consequent pole dual rotor VM (CPDRVM), consequent pole dual stator VM (CPDSVM) and dual stator spoke array VM (DSSAVM). In this regard, the key machine features considered for comparison are back-EMF, torque, torque per magnet volume (TPMV), power factor, loss, and efficiency profiles. The proposed structure (Design B) generates higher torque and TPMV compared to the other studied machines while Design A can achieve a higher power factor.

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Abbreviations

Parameter:

Description

Back-EMF:

Back electromagnetic force

DSVM:

Dual-stator vernier machine

DSSAVM:

Dual-stator spoke-array vernier machine

CPDRVM:

Consequent pole dual rotor vernier machine

CPDSVM:

Consequent pole dual stator vernier machine

FEA:

Finite-element analysis

PM:

Permanent magnet

PMVM:

Permanent-magnet vernier machine

PF:

Power factor

TPMV:

Torque per magnet volume

VM:

Vernier machine

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Authors and Affiliations

  1. Department of Electrical and Electronics Engineering, Middle East Technical University, Ankara, Turkey

    Arash Allahyari

  2. College of Science and Engineering, Flinders University, Adelaide, Australia

    Amin Mahmoudi

  3. Faculty of Electrical Engineering, Shahid Beheshti University, Tehran, Iran

    Hossein Torkaman

  4. UniSA STEM, University of South Australia, Adelaide, Australia

    Solmaz Kahourzade

Authors
  1. Arash Allahyari
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  2. Amin Mahmoudi
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  3. Hossein Torkaman
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  4. Solmaz Kahourzade
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Correspondence to Arash Allahyari.

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Allahyari, A., Mahmoudi, A., Torkaman, H. et al. A high-performance dual-stator permanent-magnet vernier machine for propulsion applications. Electr Eng 104, 3253–3263 (2022). https://doi.org/10.1007/s00202-022-01539-y

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  • DOI: https://doi.org/10.1007/s00202-022-01539-y

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