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Symmetry
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Research on Motor and Special Electromagnetic Device of Symmetry
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Research on Motor and Special Electromagnetic Device of Symmetry

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Computer".

Deadline for manuscript submissions: closed (31 January 2023) | Viewed by 12813

Special Issue Editors

Prof. Dr. Liyi Li

E-Mail Website1 Website2
Guest Editor
Department of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Interests: special electromagnetic device; control and drive of linear motors; linear electromagnetic launch; accumulation of electric energy; superconducting motors;
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Mingyi Wang

E-Mail Website
Guest Editor
School of Electrical Engineering and Automation, Harbin Institute of Technology, Herbin 150001, China
Interests: special electromagnetic device; control and drive of linear motors; linear electromagnetic launch; accumulation of electric energy; superconducting motors
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Xuzhen Huang

E-Mail Website
Guest Editor
College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Interests: special electromagnetic device; control and drive of linear motors; linear electromagnetic launch; accumulation of electric energy; superconducting motors
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Motor and special electromagnetic devices have been widely used in fields such as industrial production, transportation, high-end manufacturing, national defence and military industry, and they are an important energy power foundation for supporting social development. High-power density, high reliability, high adaptability, high precision, low emission and multifunctional composites are areas that are gradually developing at the forefront of the technological development of these devices. Future development and research will concentrate on technologies used in high-performance motors and special electromagnetic devices.

This Special Issue hopes to summarize the state-of-the-art technologies of high-performance motors and special electromagnetic devices, which include summarization of the latest structural research and analysis, operation and control, integration and optimization, etc. Papers that employ the symmetry or asymmetry concept in their methodologies in the fields of motors and special electromagnetic devices are welcomed. We also welcome scholars in related fields to contribute their latest research results to this Special Issue.

Topics of the research papers include but are not limited to: 

  • Modeling of motors and special electromagnetic devices;
  • Multi-physics coupling analysis and optimization;
  • Efficient temperature rises and cooling structure design;
  • Advanced drive technology;
  • Intelligent control strategy;
  • System high reliable operation;
  • Integrated design and analysis.

Prof. Dr. Liyi Li
Prof. Dr. Mingyi Wang
Prof. Dr. Xuzhen Huang
Guest Editors

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. Symmetry is an international peer-reviewed open access monthly 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 2400 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

  • motor
  • special electromagnetic device
  • modelling
  • electromagnetic structure
  • multi-field coupling
  • thermal characteristics
  • advanced drive
  • intelligent control
  • reliable operation
  • integration

Published Papers (5 papers)

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Research

16 pages, 2953 KiB  
Article
Study on Error Separation of Three-Probe Method
by Chengbao Zhong, Ming Zhuo, Zhong Cui and Jiqing Geng
Symmetry 2022, 14(5), 866; https://doi.org/10.3390/sym14050866 - 23 Apr 2022
Cited by 1 | Viewed by 1407
Abstract
With the advantage of in situ measurement, the three-probe method is commonly used to measure either the error motion of high-precision spindles or the roundness error of artifacts. The roundness error of artifacts or spindle errors can be obtained through solving error-separation equations. [...] Read more.
With the advantage of in situ measurement, the three-probe method is commonly used to measure either the error motion of high-precision spindles or the roundness error of artifacts. The roundness error of artifacts or spindle errors can be obtained through solving error-separation equations. Both the time- and frequency-domain solutions of the three-probe method are presented. In addition, the key points of solutions, i.e., the rounding error induced by inconsistency of sampling points, harmonic suppression, and averaging schemes of multiple revolutions into one circle, are described in detail. Experiments were conducted to compare the two solutions and quantify the influence of setup parameters, including rotational speed probe arrangement, consistency of sampling points, and number of revolutions. The results showed that the roundness error of the time-domain solution was inaccurate due to large rounding errors, while that of the frequency-domain solution with the previous average scheme was accurate. In contrast, the spindle error of the frequency-domain solution with the latter average scheme was more reliable. The findings provided a reference to recommend setup parameters depending on the aim of the three-probe method. Full article
(This article belongs to the Special Issue Research on Motor and Special Electromagnetic Device of Symmetry)
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14 pages, 11020 KiB  
Article
An Angle-Compensating, Complex-Coefficient PI Controller Used for Decoupling Control of a Permanent-Magnet Synchronous Motor
by Jing Guo, Tao Fan, Qi Li and Xuhui Wen
Symmetry 2022, 14(1), 101; https://doi.org/10.3390/sym14010101 - 7 Jan 2022
Cited by 4 | Viewed by 1700
Abstract
An asymmetric, cross-coupling effect, as well as digital control delays, in a permanent-magnet synchronous motor (PMSM) will deteriorate its current-control performance in the high-speed range, especially for electric motors used in electric vehicles (EVs) with features such as high-power density and a low [...] Read more.
An asymmetric, cross-coupling effect, as well as digital control delays, in a permanent-magnet synchronous motor (PMSM) will deteriorate its current-control performance in the high-speed range, especially for electric motors used in electric vehicles (EVs) with features such as high-power density and a low carrier/modulation frequency ratio. In this paper, an angle-compensating, complex-coefficient, proportional-integrator (ACCC-PI) controller is proposed, which aims to provide an excellent decoupling performance even with considerable digital control delay. Firstly, the current open and closed loop complex-coefficient transfer functions were established in the synchronous rotation coordinate system. The proposed method, along with existing ones, were then evaluated and theoretically compared. On this basis, the parameter-tuning method of the ACCC-PI controller was presented. Finally, simulation and experimental results proved the correctness of the theoretical analysis and the proposed method. Full article
(This article belongs to the Special Issue Research on Motor and Special Electromagnetic Device of Symmetry)
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13 pages, 51365 KiB  
Article
A Driver and Control Method for Primary Stator Discontinuous Segmented-PMLSM
by Mingyi Wang, Kai Kang, Chengming Zhang and Liyi Li
Symmetry 2021, 13(11), 2216; https://doi.org/10.3390/sym13112216 - 19 Nov 2021
Cited by 2 | Viewed by 1290
Abstract
In recent years, with the development of the permanent magnet linear synchronous motor (PMLSM), the application of PMLSM has not been limited only to the high-end equipment field; the primary stator discontinuous segmented-PMLSM (DSPMLSM), which consists of multiple primary stators and one mover, [...] Read more.
In recent years, with the development of the permanent magnet linear synchronous motor (PMLSM), the application of PMLSM has not been limited only to the high-end equipment field; the primary stator discontinuous segmented-PMLSM (DSPMLSM), which consists of multiple primary stators and one mover, has also been applied in long-distance transportation systems, such as electromagnetic launch, high precision material transport, etc. Compared with the symmetry phase parameters of conventional PMLSM, the stationary electrical parameters vary when the mover enters and leaves the primary stators (the inter-segment region). At the same time, due to the sectional power supply, there will be primary suction or pulling force when the mover enters and exits the inter-segment region, which will lead to large thrust fluctuation and result in lager position error. This paper proposed a related drive and control strategy about the DSPMLSM system, which improved the position tracking accuracy during the full range of DSPMLSM. First, the parameter variation between stator segments has been analyzed through finite element simulation of DSPMLSM. Then, a double closed-loop series control structure of position-current is designed, in which a PI-Lead controller was adopted for the position loop and a PI controller was adopted for the current loop. In order to improve the position tracking accuracy of DSPMLSM, a thrust fluctuation extended state observer (TFESO) was adopted to observe and compensate the complex thrust disturbances such as cogging force, friction and other unmodeled thrust fluctuation. At last, the DSPMLSM experimental stage was established, and the experimental results show that the proposed driver and control theory can effectively improve the position tracking accuracy of the whole stroke of DSPMLSM. Full article
(This article belongs to the Special Issue Research on Motor and Special Electromagnetic Device of Symmetry)
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22 pages, 9180 KiB  
Article
Research on Fault Diagnosis of IPMSM for Electric Vehicles Based on Multi-Level Feature Fusion SPP Network
by Bohai Liu, Qinmu Wu, Zhiyuan Li and Xiangping Chen
Symmetry 2021, 13(10), 1844; https://doi.org/10.3390/sym13101844 - 2 Oct 2021
Cited by 6 | Viewed by 1477
Abstract
At this stage, the fault diagnosis of the embedded permanent magnet synchronous motor (IPMSM) mostly relies on the analysis of related signals when the motor is running. It requires designers to deeply understand the motor drive system and fault characteristic signals, which leads [...] Read more.
At this stage, the fault diagnosis of the embedded permanent magnet synchronous motor (IPMSM) mostly relies on the analysis of related signals when the motor is running. It requires designers to deeply understand the motor drive system and fault characteristic signals, which leads to a high threshold for fault diagnosis. This study proposes an IPMSM fault diagnosis method based on a multi-level feature fusion spatial pyramid pooling (SPP) network, which can directly diagnose motor faults through motor operating current data. This method uses the finite element software Altair Flux to build symmetrical normal motor and demagnetization faulty motor models, as well as an asymmetrical eccentric fault model; conduct a joint simulation with MATLAB-Simulink to obtain fault current data; convert the collected current data into grayscale images, using the data set expansion method to form training and test data sets; and improve the convolutional neural network (CNN) network structure, that is, adding jump connections after each pooling layer and adding a spatial pyramid pooling layer after the last pooling layer to form a new CNN structure. Experimental results show that the new CNN can extract different levels and different scales of motor fault features hidden in the image, and can effectively diagnose different types of IPMSM faults. Compared with the traditional CNN, the new CNN has a higher fault diagnosis accuracy, up to 98.16%, 2.3% higher. Full article
(This article belongs to the Special Issue Research on Motor and Special Electromagnetic Device of Symmetry)
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11 pages, 3344 KiB  
Article
A Novel Closed-Loop Control Method for Li-Ion Batteries Connected in Series Power Supply Based on the Time Sequences Recalculation Algorithm
by Qiang Tan, Yinghui Gao, Kun Liu, Xuzhe Xu, Yaohong Sun and Ping Yan
Symmetry 2021, 13(8), 1463; https://doi.org/10.3390/sym13081463 - 10 Aug 2021
Cited by 2 | Viewed by 1284
Abstract
The charging time of Li-ion batteries connected in series (LBCSs) power supply is the main concern in an electromagnetic propulsion system. However, the capacity loss of a Li-ion battery is inevitable due to the repetitive operation of LBCSs power supply, which leads to [...] Read more.
The charging time of Li-ion batteries connected in series (LBCSs) power supply is the main concern in an electromagnetic propulsion system. However, the capacity loss of a Li-ion battery is inevitable due to the repetitive operation of LBCSs power supply, which leads to the decrease in the average current. Thus, the voltages of symmetrically distributed pulse capacitors of LBCSs power supply will not reach the setting value in the specified time. This paper proposes a novel closed-loop control method to solve the problem. By collecting the pulse capacitor voltage and the circuit current, the time sequences of Li-ion batteries are recalculated in real time in a closed-loop to increase the average current. The time-domain model of the circuit topology of the LBCSs power supply and an innovative closed-loop control method based on the time sequences recalculation algorithm are described first. Then, the circuit model is built in PSIM for simulation analyses. Finally, a series of experiments are conducted to confirm the effectiveness of the method on the megawatt LBCSs power supply platform. Both the simulation and experimental results validate that the proposed method not only shortens the charging time, but also increases the average current. In practical experiments, the charging time is shortened by 4.5% and the average current is increased by 4.8% using the proposed method at the capacity loss of 50 V. Full article
(This article belongs to the Special Issue Research on Motor and Special Electromagnetic Device of Symmetry)
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