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New Advances in Permanent Magnet Electrical Machines
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New Advances in Permanent Magnet Electrical Machines

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "F: Electrical Engineering".

Deadline for manuscript submissions: closed (31 May 2022) | Viewed by 17802
Submit your paper and select the Journal “Energies” and the Special Issue “New Advances in Permanent Magnet Electrical Machines” via: https://susy.mdpi.com/user/manuscripts/upload?journal=energies. Please contact the guest editor or the journal editor ([email protected]) for any queries.

Special Issue Editor

Dr. Florin Nicolae Jurca

E-Mail Website
Guest Editor
Department of Electrical Machines and DrivesTechnical University of Cluj Napoca, 400114 Cluj-Napoca, Romania
Interests: electrical machines with or without permanent magnets; various topologies (radial, axial, outer rotor or modular construction) of electrical machines; electrical propulsion systems for various types of electrical vehicles; generators for renewables-based systems
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Permanent magnet synchronous machines have become, since the beginning of the 1980s, the most important topologies of electric machines for industrial applications. Therefore, they are used in various applications ranging from microrobotics to electric propulsion. Today more than ever, due to the growing constraints of size and efficiency, it is necessary to develop electric machines that respond better to these challenges. Electric machines with permanent magnets remain the best candidates due to the possibility of being incorporated in various configurations according to specific applications in conditions of high efficiency.

This Special Issue aims to provide an opportunity for researchers to present their recent work on the permanent magnets’ electric machines. We welcome any article dealing with:

  • New design trends of permanent magnet electric machines;
  • Applications of new magnetic materials;
  • Permanent magnet electric machines for specific applications;
  • New topologies (rotational machines, linear machines, spherical machines, modular machines);
  • Demagnetization analysis;
  • Magnetic-geared electric machines;
  • Noise, vibration, and heat analysis on permanent magnet electric machines;
  • Control strategies;
  • New adaption techniques to estimate state variables and parameters;
  • Optimization techniques.

Dr. Florin Nicolae Jurca
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

  • permanent magnet
  • electric machines
  • novel topologies
  • new magnetic materials
  • magnetic-geared
  • thermal field analysis
  • NVH (noise, vibration, and harshness)

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Published Papers (7 papers)

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Research

13 pages, 3869 KiB  
Article
Three-Dimensional Numerical Characterization of High-Temperature Superconductor Bulks Subjected to Rotating Magnetic Fields
by Wafa Ali Soomro, Youguang Guo, Haiyan Lu, Jianguo Zhu, Jianxun Jin and Boyang Shen
Energies 2022, 15(9), 3186; https://doi.org/10.3390/en15093186 - 27 Apr 2022
Cited by 4 | Viewed by 1832
Abstract
High-temperature superconductor (HTS) bulks have shown very promising potential for industrial applications due to the ability to trap much higher magnetic fields compared to traditional permanent magnets. In rotating electrical machines, the magnetic field is a combination of alternating and rotating fields. On [...] Read more.
High-temperature superconductor (HTS) bulks have shown very promising potential for industrial applications due to the ability to trap much higher magnetic fields compared to traditional permanent magnets. In rotating electrical machines, the magnetic field is a combination of alternating and rotating fields. On the contrary, all studies on electromagnetic characterization of HTS presented in the literature so far have only focused on alternating AC magnetic fields and alternating AC loss due to the unavailability of robust experimental techniques and analytical models. This paper presents a numerical investigation on the characterization of HTS bulks subjected to rotating magnetic fields showing AC loss, current density distribution in three-dimensional axes, and trapped field analysis. A three-dimensional numerical model has been developed using H-formulation based on finite element analysis. An HTS cubic sample is magnetized and demagnetized with two-dimensional magnetic flux density vectors rotating in circular orientation around the XOY, XOZ, and YOZ planes. Full article
(This article belongs to the Special Issue New Advances in Permanent Magnet Electrical Machines)
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17 pages, 6306 KiB  
Article
Design Issues of a Rotating to Linear Motion Magnetic Converter for Short-Distance Transport Applications
by Mauro Andriollo, Simone Bernasconi and Andrea Tortella
Energies 2021, 14(24), 8464; https://doi.org/10.3390/en14248464 - 15 Dec 2021
Viewed by 2770
Abstract
This paper discusses some design issues of a magnetic rotating to linear motion converter (RLMC), suitable for the propulsion system of a short-distance low-capacity vehicle. It basically operates like a magnetic rack, which executes the contactless conversion of the motor torque into a [...] Read more.
This paper discusses some design issues of a magnetic rotating to linear motion converter (RLMC), suitable for the propulsion system of a short-distance low-capacity vehicle. It basically operates like a magnetic rack, which executes the contactless conversion of the motor torque into a propulsion thrust, deriving from the interaction of on-board permanent magnet (PM) modules and stationary ferromagnetic steel pieces. A design procedure is set up that deals with both the PM module arrangement and the geometric shape of the steel pieces to optimize different performance aspects. A simplified modeling based on 2D transient finite element analyses is carried out to determine the thrust profile and the RLMC losses, which are essential to assess its practical feasibility. Finally, the characteristics as functions of the load angle and speed are determined to enable the prediction of the dynamic power exchange and then of the net energy demand useful to size the on-board source. Full article
(This article belongs to the Special Issue New Advances in Permanent Magnet Electrical Machines)
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16 pages, 5985 KiB  
Article
Direct Fuzzy CMAC Sliding Mode Trajectory Tracking for Biaxial Position System
by Wei-Lung Mao, Yu-Ying Chiu, Bing-Hong Lin, Wei-Cheng Sun and Jian-Fu Tang
Energies 2021, 14(22), 7802; https://doi.org/10.3390/en14227802 - 22 Nov 2021
Cited by 1 | Viewed by 1691
Abstract
High-precision trajectory control is considered as an important factor in the performance of industrial two-axis contour motion systems. This research presents an adaptive direct fuzzy cerebellar model articulation controller (CMAC) sliding mode control (DFCMACSMC) for the precise control of the industrial XY-axis motion [...] Read more.
High-precision trajectory control is considered as an important factor in the performance of industrial two-axis contour motion systems. This research presents an adaptive direct fuzzy cerebellar model articulation controller (CMAC) sliding mode control (DFCMACSMC) for the precise control of the industrial XY-axis motion system. The FCMAC was utilized to approximate an ideal controller, and the weights of FCMAC were on-line tuned by the derived adaptive law based on the Lyapunov criterion. With this derivation in mind, the asymptotic stability of the developed motion system could be guaranteed. The two-axis stage system was experimentally investigated using four contours, namely, circle, bowknot, heart, and star reference contours. The experimental results indicate that the proposed DFCMACSMC method achieved the improved tracking capability, and so reveal that the DFCMACSMC scheme outperformed other schemes of the model uncertainties and cross-coupling interference. Full article
(This article belongs to the Special Issue New Advances in Permanent Magnet Electrical Machines)
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16 pages, 10275 KiB  
Article
Noise Reduction Design with Trapezoidal Back-EMF and Asymmetric Air-Gap for Single-Phase BLDC Refrigerator Cooling Fan Motor
by Jin-Hwan Lee and Sang-Yong Jung
Energies 2021, 14(17), 5467; https://doi.org/10.3390/en14175467 - 2 Sep 2021
Cited by 2 | Viewed by 2301
Abstract
In this study, a novel method for reducing the noise generated by single-phase claw-pole motors employed as refrigerator fan blowers is proposed. A single-phase claw-pole motor has the advantages of low manufacturing cost, easy manufacturing, and a high number of turns. However, in [...] Read more.
In this study, a novel method for reducing the noise generated by single-phase claw-pole motors employed as refrigerator fan blowers is proposed. A single-phase claw-pole motor has the advantages of low manufacturing cost, easy manufacturing, and a high number of turns. However, in such motors, current delays occur owing to a high inductance; therefore, it is necessary to merge the back-electromotive force and current phases into the same phase using the phase advance method. Additionally, a single-phase motor exhibits dead torque and zero torque at an electrical angle of 180° owing to its electrical characteristics, and the dead torque deteriorates the average torque and torque ripple characteristics of the motor. In this study, a novel method is proposed to make the air gap asymmetrical by tilting the claw to reduce the noise generated by single-phase claw-pole motors. An asymmetric air gap allows the cogging torque to eliminate the dead torque caused by alignment torques, causing the torque ripple to decrease. To validate the effectiveness of the proposed method, the proposed model is compared with a base model via three-dimensional finite element analysis. Furthermore, the two models are manufactured and a noise test is conducted in an anechoic chamber to compare the noise difference between the two models. Full article
(This article belongs to the Special Issue New Advances in Permanent Magnet Electrical Machines)
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17 pages, 25126 KiB  
Article
Design and Implement of Three-Phase Permanent-Magnet Synchronous Wave Generator using Taguchi Approach
by Chun-Yu Hsiao, Chin-Hsiang Lai, Zhu-Xuan Zheng and Guan-Yu Li
Energies 2021, 14(7), 2010; https://doi.org/10.3390/en14072010 - 5 Apr 2021
Cited by 2 | Viewed by 2945
Abstract
In this paper, the design and performance analysis of a high-efficiency permanent-magnet synchronous wave generator (PSWG) are presented. A systematic approach for the design of the outer rotor was proposed as a prototype model. The magnetic field, magnetic circuit characteristics, electrical characteristics of [...] Read more.
In this paper, the design and performance analysis of a high-efficiency permanent-magnet synchronous wave generator (PSWG) are presented. A systematic approach for the design of the outer rotor was proposed as a prototype model. The magnetic field, magnetic circuit characteristics, electrical characteristics of the generator, and optimal design parameters such as the pole–arc ratio and shoe outer length were determined using the Taguchi method, finite-element analysis (FEA) software, and rotor skewing techniques. The proposed six series and six parallel-connection winding configurations can provide an evenly distributed current for practical applications. A PSWG was designed and fabricated according to the proposed methodology. According to the experimental results by implementing the optimized design, the efficiencies of the proposed PSWG which used 3.6 Ω load at 300 rpm is 86.32% and the efficiency error between simulation and experiment is less than 1.8%. It verifies the feasibility of the proposed method to PSWG and the structural reliability optimization design. Full article
(This article belongs to the Special Issue New Advances in Permanent Magnet Electrical Machines)
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18 pages, 10848 KiB  
Article
Improvement in Torque Density by Ferrofluid Injection into Magnet Tolerance of Interior Permanent Magnet Synchronous Motor
by In-Jun Yang, Si-Woo Song, Dong-Ho Kim, Kwang-Soo Kim and Won-Ho Kim
Energies 2021, 14(6), 1736; https://doi.org/10.3390/en14061736 - 21 Mar 2021
Cited by 5 | Viewed by 2516
Abstract
In an interior permanent magnet synchronous motor, an adhesive such as bond is generally injected into the magnet tolerance to prevent vibration of the permanent magnet within the insertion space. In this case, a disadvantage is that the magnet tolerance does not contribute [...] Read more.
In an interior permanent magnet synchronous motor, an adhesive such as bond is generally injected into the magnet tolerance to prevent vibration of the permanent magnet within the insertion space. In this case, a disadvantage is that the magnet tolerance does not contribute to the performance. In this paper, ferrofluid is inserted to improve the torque density, utilizing the magnet tolerance. When inserting ferrofluid into the magnet tolerance, it is important to fix the magnet because conventional adhesives are not used, and it is important that the ferrofluid does not act as a leakage path within the insertion space. In this study, a new rotor configuration using a plastic barrier that satisfies these considerations was introduced. The analysis was conducted through finite element analysis (FEA), and this technique was verified by comparing the simulation results and the experimental results through a dynamo test. It was confirmed that the no-load back electromotive force in the final model increased through ferrofluid injection. Full article
(This article belongs to the Special Issue New Advances in Permanent Magnet Electrical Machines)
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14 pages, 9177 KiB  
Article
A Study on Core Skew Considering Manufacturability of Double-Layer Spoke-Type PMSM
by Dong-Woo Nam, Kang-Been Lee, Hyun-Jo Pyo, Min-Jae Jeong, Seo-Hee Yang, Won-Ho Kim and Hyung-Kwan Jang
Energies 2021, 14(3), 610; https://doi.org/10.3390/en14030610 - 26 Jan 2021
Cited by 11 | Viewed by 2611
Abstract
The spoke-type permanent magnet synchronous motor (PMSM), which is a general ferrite magnetic flux-concentrated motor, has a low portion of reluctance torque at the total torque magnitude. Therefore, as a way to increase the reluctance torque, there is a double-layer spoke-type PMSM that [...] Read more.
The spoke-type permanent magnet synchronous motor (PMSM), which is a general ferrite magnetic flux-concentrated motor, has a low portion of reluctance torque at the total torque magnitude. Therefore, as a way to increase the reluctance torque, there is a double-layer spoke-type PMSM that can maximize the difference in inductance between the d-axis and the q-axis. However, in the double-layer spoke-type PMSM, cogging torque, torque ripple, and total harmonic distortion (THD) increase with reluctance torque, which is the main cause of vibration and noise. In this paper, a method is proposed that provides the same effect as skew without dividing stages of the permanent magnet by dividing the core of the rotor into two types so that it is easy to manufacture according to the number of stages, unlike extant skew methods. Based on the method, the reduction in cogging torque and THD was verified by finite element analysis (FEA). Full article
(This article belongs to the Special Issue New Advances in Permanent Magnet Electrical Machines)
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