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Advanced Techniques for High-Performance Permanent Magnet Motors

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

Deadline for manuscript submissions: closed (20 August 2021) | Viewed by 15894

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Prof. Dr. Jin Hur

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Guest Editor

Faculty of Engineering, Incheon National University, Incheon 22012, Republic of Korea
Interests: High-performance electrical machines; motor fault detection and tolerance control; new concept actuators for special purposes; numerical analysis of electromagnetic fields; electric vehicles

Special Issue Information

Dear Colleagues,

The Guest Editor is inviting submissions to a Special Issue of Energies on the subject area of “Advanced Techniques for High-Performance Permanent Magnet Motors”.

Motor design technology for performance improvement is very important for optimal operation in various applications according to the load. There have been many emerging techniques for improving permanent magnet motors in recent years. In addition to introducing a permanent magnet motor with a new structure, various changes in the structure of an existing motor according to a load pattern have been proposed. Moreover, motor fault detection and fault tolerance control are also interesting topics for motor design and control researchers.

This Special Issue will deal with novel design and control techniques for permanent magnet motors. Topics of interest for publication include, but are not limited to:

Design optimization of permanent magnet motors;
Permanent-magnet Vernier machines;
Axial flux permanent magnet machines;
Robust design of permanent magnet motors;
Application of IoT and/or AI for motor design and control;
Control method of permanent magnet motors;
Fault detection of permanent magnet motors;
Fault tolerance control of permanent magnet motors;
Application of fault detection algorithms and their control.

Prof. Dr. Jin Hur
Guest Editor

Manuscript Submission Information

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Keywords

permanent magnet motors
robust design
optimization techniques
control methods
motor fault analysis
motor fault detection
tolerance control
IoT/AI

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Published Papers (6 papers)

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Research

15 pages, 3027 KiB

Open AccessArticle

Optimal Design of Step-Sloping Notches for Cogging Torque Minimization of Single-Phase BLDC Motors

by Yong-woon Park, Jae-sub Ko and Dae-kyong Kim

Energies 2021, 14(21), 7104; https://doi.org/10.3390/en14217104 - 1 Nov 2021

Cited by 3 | Viewed by 2153

Abstract

This paper presents a method for reducing the cogging torque for a sloping notch with two notches applied on the stator teeth. The accuracy of FEA was confirmed by a comparison with a previous model using an asymmetric notch for the experiment data and 3D FEA results, followed by a comparison of the cogging torque of a two notches model and a sloping notch model. The sloping notch model was modified to a step-sloping notch model in consideration of a potential manufacturing process. The optimal design for minimizing the cogging torque was developed considering the sloping degree, angle, position, and size of the notches. As the optimal design result, the cogging torque on the optimal model was reduced. Finally, the analysis and optimal design results were confirmed by FEA. Full article

(This article belongs to the Special Issue Advanced Techniques for High-Performance Permanent Magnet Motors)

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13 pages, 6432 KiB

Open AccessArticle

An Improved Finite-Control-Set Model Predictive Current Control for IPMSM under Model Parameter Mismatches

by Zehao Lyu, Xiang Wu, Jie Gao and Guojun Tan

Energies 2021, 14(19), 6342; https://doi.org/10.3390/en14196342 - 4 Oct 2021

Cited by 6 | Viewed by 1852

Abstract

The control performance of the finite control set model predictive current control (FCS-MPCC) for the interior permanent magnet synchronous machine (IPMSM) depends on the accuracy of the mathematical model. A novel robust model predictive current control method based on error compensation is proposed in order to reduce the parameter sensitivity and improve the current control robustness. In this method, the equivalent parameters are obtained from the known voltage and current information at the past time and the error between the predicted current and the actual current at the present time, which is utilized in the two-step prediction process to compensate the parameter mismatch error. Finally, the optimal voltage vector is selected by the cost function. The proposed method is compared with the traditional model predictive current control method through experiments. The experimental results show the effectiveness of the proposed method. Full article

(This article belongs to the Special Issue Advanced Techniques for High-Performance Permanent Magnet Motors)

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12 pages, 4503 KiB

Open AccessArticle

Improved Immune Algorithm Combined with Steepest Descent Method for Optimal Design of IPMSM for FCEV Traction Motor

by Ji-Chang Son, Myung-Ki Baek, Sang-Hun Park and Dong-Kuk Lim

Energies 2021, 14(13), 3904; https://doi.org/10.3390/en14133904 - 29 Jun 2021

Cited by 2 | Viewed by 1812

Abstract

In this paper, an improved immune algorithm (IIA) was proposed for the torque ripple reduction optimal design of an interior permanent magnet synchronous motor (IPMSM) for a fuel cell electric vehicle (FCEV) traction motor. When designing electric machines, both global and local solutions of optimal designs are required as design result should be compared in various aspects, including torque, torque ripple, and cogging torque. To lessen the computational burden of optimization using finite element analysis, the IIA proposes a method to efficiently adjust the generation of additional samples. The superior performance of the IIA was verified through the comparison of optimization results with conventional optimization methods in three mathematical test functions. The optimal design of an IPMSM using the IIA was conducted to verify the applicability in the design of practical electric machines. Full article

(This article belongs to the Special Issue Advanced Techniques for High-Performance Permanent Magnet Motors)

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19 pages, 13220 KiB

Open AccessArticle

Diagnosis and Robust Design Optimization of SPMSM Considering Back EMF and Cogging Torque due to Static Eccentricity

by Jin-Cheol Park, Soo-Hwan Park, Jae-Hyun Kim, Soo-Gyung Lee, Geun-Ho Lee and Myung-Seop Lim

Energies 2021, 14(10), 2900; https://doi.org/10.3390/en14102900 - 17 May 2021

Cited by 6 | Viewed by 2928

Abstract

Static eccentricity (SE) is frequently generated by manufacturing processes. As the nonuniformity of the air-gap length is caused by the SE, the torque ripple and cogging torque increase in the motor. This study analyzes the distorted back electromotive force (EMF) and cogging torque due to SE. Further, a motor design considering SE is performed for stable back EMF and low cogging torque. First, the SE was diagnosed and analyzed using the back EMF and cogging torque measured from the test results of the base model. In addition, the rotor position was calculated using the unbalanced back EMF due to the SE. The calculated rotor position is used when analyzing phenomena due to SE and applied to robust design. Subsequently, robust design optimization was performed to improve the unbalanced back EMF and cogging torque due to SE. Using finite element analysis (FEA) considering SE, the shape of the stator was designed based on the base model. The estimated rotor position from the base model was applied to the optimum model to confirm its robustness from SE’s effects. Finally, the base and optimum models were compared through the test results. Full article

(This article belongs to the Special Issue Advanced Techniques for High-Performance Permanent Magnet Motors)

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15 pages, 8250 KiB

Open AccessArticle

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

by Mudassir Raza Siddiqi, Tanveer Yazdan, Jun-Hyuk Im, Muhammad Humza and Jin Hur

Energies 2021, 14(8), 2311; https://doi.org/10.3390/en14082311 - 20 Apr 2021

Cited by 10 | Viewed by 3551

Abstract

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. Full article

(This article belongs to the Special Issue Advanced Techniques for High-Performance Permanent Magnet Motors)

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13 pages, 4916 KiB

Open AccessArticle

Application of Perovskite Layer to Rotor for Enhanced Stator-Rotor Capacitance for PMSM Shaft Voltage Reduction

by Muhammad Aqil, Jun-Hyuk Im and Jin Hur

Energies 2020, 13(21), 5762; https://doi.org/10.3390/en13215762 - 3 Nov 2020

Cited by 4 | Viewed by 2550

Abstract

Adjustable speed drives use Pulse Width Modulation (PWM) to switch DC-bus voltage for the synthesis of three-phase voltages to provide power to the permanent magnet synchronous motor (PMSM). This switching action produces very short rise and fall times and Common Mode Voltage (CMV) in the motor winding, exciting the parasitic capacitances inherent to the motor geometry. These parasitic capacitances give rise to shaft voltage due to a voltage divider action. Therefore, in this paper, first, motor parasitic capacitances and voltage divider action is explained. Second, the Barium Titanate (BTO) layer is coated onto the rotor to enhance stator-to-rotor compound capacitance and a simulation is performed showing the dependence of the shaft voltage on the permittivity of the perovskite (BTO) layer. The rotor BTO layer reduces the bearing voltage ratio as well. Third, experimental results are presented showing effectiveness of the application of the BTO layer to rotor and reduction of shaft voltage of the motor in anticipation to mitigate the damaging electric discharge machining (EDM) bearing currents. Likewise, the experiment shows that the magnetic design of the motor is not affected by the BTO layer to rotor. Full article

(This article belongs to the Special Issue Advanced Techniques for High-Performance Permanent Magnet Motors)

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