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Energies
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General Design, Analysis and Advanced Control of Axial-Flux Electric Machine
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General Design, Analysis and Advanced Control of Axial-Flux Electric Machine

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "E: Electric Vehicles".

Deadline for manuscript submissions: closed (28 January 2022) | Viewed by 13526

Special Issue Editor

Prof. Dr. Mingyao Lin

E-Mail Website
Guest Editor
Department of Electrical Machine and Control, School of Electrical Engineering, Southeast University, Nanjing 210096, China
Interests: high efficiency PM machine design and control; electric (hybrid) vehicle drive and control; power electronics and power drives

Special Issue Information

Dear Colleagues,

The Guest Editor is inviting submissions for a Special Issue of Energies on the subject area of “General Design, Analysis and Advanced Control of Axial-Flux Electric Machine“. In recent years, the novel topology, electromagnetic design, equivalent megnetic circuit model, coupling multi-physical field analysis, multi-objective optimization and control method for the axial-flux electric machine are researched, and the performance of the axial-flux electric machine and system is improved greatly. Design, optimization and control techniques are important for the high power density, high efficiency and low torque pulsation axial-flux electric machine.

This Special Issue will deal with novel design, analysis and control techniques for axial-flux electric machine. Topics of interest for publication include, but are not limited to:

  • Novel topology;
  • Mathematical modelling and efficient calculation method;
  • Thermal management system;
  • New materials and application;
  • Power dencity and efficiency improvement methods;
  • Multi-physics analysis and multi-objective optimization;
  • Fault-tolerant operation and coordinate control;
  • Advanced control methods;
  • Position sensorless techniques;
  • Calculation and measurement of stray effects and losses;
  • System integrated techiniques.

Prof. Dr. Mingyao Lin
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Axial-flux electric machine
  • Electromagnetic design
  • Multi-physics modeling
  • Thermal management
  • Optimization techniques
  • Fault-tolerant operation
  • Control methods
  • Sensorless techniques
  • System integrated techniques

Published Papers (4 papers)

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Research

13 pages, 4072 KiB  
Article
Design and Analysis of Dual-Rotor Modular-Stator Hybrid-Excited Axial-Flux Permanent Magnet Vernier Machine
by Lun Jia, Mingyao Lin, Keman Lin, Wei Le and Anchen Yang
Energies 2022, 15(4), 1458; https://0-doi-org.brum.beds.ac.uk/10.3390/en15041458 - 16 Feb 2022
Cited by 3 | Viewed by 2147
Abstract
This paper proposes a new structure of the dual-rotor hybrid-excited axial-flux permanent magnet vernier machine (DR-HEAFPMVM) with the modular stator and the consequent-pole PM (CPM) rotor for low-speed, high torque density applications such as in-wheel electric vehicles. The tooth-wound non-overlapping armature windings and [...] Read more.
This paper proposes a new structure of the dual-rotor hybrid-excited axial-flux permanent magnet vernier machine (DR-HEAFPMVM) with the modular stator and the consequent-pole PM (CPM) rotor for low-speed, high torque density applications such as in-wheel electric vehicles. The tooth-wound non-overlapping armature windings and direct current (DC) excitation windings are, respectively, arranged in stator main-teeth and split-teeth to obtain the modulated and adjustable air-gap flux densities, resulting in high torque density and outstanding flux-weakening capability. First, the design considerations, operation principles, and air-gap flux density distributions of the proposed machine are elaborated based on the air-gap permeance function. Then, the influence of the pole ratios (PRs) and the DC excitation currents on the main electromagnetic performances of the DR-HEAFPMVM, such as the flux-weakening capability and back-electromotive force (back-EMF), on-load electromagnetic torque, loss distribution, and efficiencies, is investigated using the 3-D finite-element method (FEM). Results verify the feasibility of the flux adjustment of the DC excitation windings equipped in the split-tooth, and the design with a pole ratio of 8/1 tends to have higher torque density, higher machine efficiency, and considerable flux-weakening capability compared with the other two PRs. Full article
(This article belongs to the Special Issue General Design, Analysis and Advanced Control of Axial-Flux Electric Machine)
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15 pages, 5112 KiB  
Article
A Novel Stator Cooling Structure for Yokeless and Segmented Armature Axial Flux Machine with Heat Pipe
by Wei Le, Mingyao Lin, Keman Lin, Kai Liu, Lun Jia, Anchen Yang and Shuai Wang
Energies 2021, 14(18), 5717; https://0-doi-org.brum.beds.ac.uk/10.3390/en14185717 - 10 Sep 2021
Cited by 21 | Viewed by 3630
Abstract
The yokeless and segmented armature axial flux machine is considered an excellent topology for electric vehicles application. However, its performance is severely limited by the stator cooling system. The heat pipe, as the small size, lightweight, but highly efficient passive phase-change cooling element, [...] Read more.
The yokeless and segmented armature axial flux machine is considered an excellent topology for electric vehicles application. However, its performance is severely limited by the stator cooling system. The heat pipe, as the small size, lightweight, but highly efficient passive phase-change cooling element, has been attracting more and more attention in the thermal management methods of electric motors. Therefore, the relationship between the thermal performance of the heat pipe with temperature is measured in detail through an experimental test platform in this paper. Further, a novel stator cooling structure that combines the heat pipe with the housing water-cooling method is introduced to improve the temperature distribution of the stator. Computational fluid dynamics (CFD) simulation verifies that the proposed cooling structure can accelerate the release of heat from the stator and reduce the temperature of the stator significantly. Full article
(This article belongs to the Special Issue General Design, Analysis and Advanced Control of Axial-Flux Electric Machine)
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17 pages, 5471 KiB  
Article
Investigation of the Torque Production Mechanism of Dual-Stator Axial-Field Flux-Switching Permanent Magnet Motors
by Shuai Wang, Mingyao Lin, Keman Lin and Yong Kong
Energies 2021, 14(17), 5498; https://0-doi-org.brum.beds.ac.uk/10.3390/en14175498 - 03 Sep 2021
Viewed by 1280
Abstract
This paper studies the torque production mechanism of the dual-stator axial-field flux-switching permanent magnet (DSAFFSPM) machine. Due to the double-sided slotting design of such topology, more resultant air-gap working harmonics in the air-gap flux density are responsible for the torque production and the [...] Read more.
This paper studies the torque production mechanism of the dual-stator axial-field flux-switching permanent magnet (DSAFFSPM) machine. Due to the double-sided slotting design of such topology, more resultant air-gap working harmonics in the air-gap flux density are responsible for the torque production and the stator air-gap permeance is especially considered in the investigation. Based on the magnetic force (MMF)-permeance model, the composition and difference of the air-gap working harmonics are demonstrated. The DSAFFSPM machine torque contributions of the main working harmonics are analyzed theoretically and quantified by finite element analysis (FEA). The influence laws of the parameters on the working harmonics are shown and this effectively improves the motor operation performance. Finally, some experiments on the DSAFFSPM machine are carried out to validate the analytical and FEA results. Full article
(This article belongs to the Special Issue General Design, Analysis and Advanced Control of Axial-Flux Electric Machine)
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17 pages, 10055 KiB  
Article
Design and Analysis of a Novel Axial-Radial Flux Permanent Magnet Machine with Halbach-Array Permanent Magnets
by Rundong Huang, Chunhua Liu, Zaixin Song and Hang Zhao
Energies 2021, 14(12), 3639; https://0-doi-org.brum.beds.ac.uk/10.3390/en14123639 - 18 Jun 2021
Cited by 32 | Viewed by 5523
Abstract
Electric machines with high torque density are needed in many applications, such as electric vehicles, electric robotics, electric ships, electric aircraft, etc. and they can avoid planetary gears thus reducing manufacturing costs. This paper presents a novel axial-radial flux permanent magnet (ARFPM) machine [...] Read more.
Electric machines with high torque density are needed in many applications, such as electric vehicles, electric robotics, electric ships, electric aircraft, etc. and they can avoid planetary gears thus reducing manufacturing costs. This paper presents a novel axial-radial flux permanent magnet (ARFPM) machine with high torque density. The proposed ARFPM machine integrates both axial-flux and radial-flux machine topologies in a compact space, which effectively improves the copper utilization of the machine. First, the radial rotor can balance the large axial forces on axial rotors and prevent them from deforming due to the forces. On the other hand, the machine adopts Halbach-array permanent magnets (PMs) on the rotors to suppress air-gap flux density harmonics. Also, the Halbach-array PMs can reduce the total attracted force on axial rotors. The operational principle of the ARFPM machine was investigated and analyzed. Then, 3D finite-element analysis (FEA) was conducted to show the merits of the ARFPM machine. Demonstration results with different parameters are compared to obtain an optimal structure. These indicated that the proposed ARFPM machine with Halbach-array PMs can achieve a more sinusoidal back electromotive force (EMF). In addition, a comparative analysis was conducted for the proposed ARFPM machine. The machine was compared with a conventional axial-flux permanent magnet (AFPM) machine and a radial-flux permanent magnet (RFPM) machine based on the same dimensions. This showed that the proposed ARFPM machine had the highest torque density and relatively small torque ripple. Full article
(This article belongs to the Special Issue General Design, Analysis and Advanced Control of Axial-Flux Electric Machine)
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