Pub Date : 2023-07-12DOI: 10.30941/CESTEMS.2023.00034
G. Kovács
The magnetic field generated in the air gap of the cage asynchronous machine and the harmonics of the magnetomotive forces creating that magnetic field, as well as the related differential leakage, attenuation, asynchronous parasitic torques have been discussed in great detail in the literature, but always separately, for a long time. However, systematization of the phenomenon still awaits. Therefore, it is worth summarizing the completeness of the phenomena in a single study – with a new approach at the same time - in order to reveal the relationships between them. The role of rotor slot number is emphasized much more than before. An existing, commonly used, but still impractical basic figure has been modified to more clearly demonstrate the response of the rotor for the harmonics of the stator. The need to treat differential leakage, asynchronous parasitic torques and attenuation together will be demonstrated: new formula for asynchronous parasitic torque is derived; the long-used characteristic curves for differential leakage and attenuation used separately so far was merged into one, correct curve in order to provide a correct design guide for the engineers.
{"title":"Harmonics in the Squirrel Cage Induction Motor Analytic Calculation - Part I: Differential Leakage, Attenuation, Asynchronous Parasitic Torques","authors":"G. Kovács","doi":"10.30941/CESTEMS.2023.00034","DOIUrl":"https://doi.org/10.30941/CESTEMS.2023.00034","url":null,"abstract":"The magnetic field generated in the air gap of the cage asynchronous machine and the harmonics of the magnetomotive forces creating that magnetic field, as well as the related differential leakage, attenuation, asynchronous parasitic torques have been discussed in great detail in the literature, but always separately, for a long time. However, systematization of the phenomenon still awaits. Therefore, it is worth summarizing the completeness of the phenomena in a single study – with a new approach at the same time - in order to reveal the relationships between them. The role of rotor slot number is emphasized much more than before. An existing, commonly used, but still impractical basic figure has been modified to more clearly demonstrate the response of the rotor for the harmonics of the stator. The need to treat differential leakage, asynchronous parasitic torques and attenuation together will be demonstrated: new formula for asynchronous parasitic torque is derived; the long-used characteristic curves for differential leakage and attenuation used separately so far was merged into one, correct curve in order to provide a correct design guide for the engineers.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873789/10272303/10181100.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68150002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-12DOI: 10.30941/CESTEMS.2023.00032
Xuan Tu;Xinguo Hou;Jinghong Zhao;Sinian Yan;Yiyong Xiong
In the linear induction motor control system, the optical grating speed transducer is susceptible to strong magnetic field interference. What's more, it may reduce motor integration and raise device costs. Therefore a speed identification method to replace grating speed transducer is studied in this article. This speed identification method for linear induction motor mainly adopts Model Reference Adaptive Method (Abbreviated as MRAS) and Popov Hyperstability Theory. The research content of this paper can be divided into four parts. First, the mathematical model of the motor based on the model reference adaptive system structure is deduced. Second, the adaptive law of the estimated speed is solved by Popov hyper-stability theory, which ensures the stability of the system. Third, the simulation model of the linear induction motor speed identification control system based on model reference adaptation is built in the MATLAB environment. Finally, the simulation test and analysis are carried out. The simulation results show that the speed identification control system can track the actual speed of the linear induction motor well in the no-load operation and the load operation, and the stability of the system is guaranteed in the full speed range.
{"title":"Speed Identification of Speed Sensorless Linear Induction Motor Based on MRAS","authors":"Xuan Tu;Xinguo Hou;Jinghong Zhao;Sinian Yan;Yiyong Xiong","doi":"10.30941/CESTEMS.2023.00032","DOIUrl":"https://doi.org/10.30941/CESTEMS.2023.00032","url":null,"abstract":"In the linear induction motor control system, the optical grating speed transducer is susceptible to strong magnetic field interference. What's more, it may reduce motor integration and raise device costs. Therefore a speed identification method to replace grating speed transducer is studied in this article. This speed identification method for linear induction motor mainly adopts Model Reference Adaptive Method (Abbreviated as MRAS) and Popov Hyperstability Theory. The research content of this paper can be divided into four parts. First, the mathematical model of the motor based on the model reference adaptive system structure is deduced. Second, the adaptive law of the estimated speed is solved by Popov hyper-stability theory, which ensures the stability of the system. Third, the simulation model of the linear induction motor speed identification control system based on model reference adaptation is built in the MATLAB environment. Finally, the simulation test and analysis are carried out. The simulation results show that the speed identification control system can track the actual speed of the linear induction motor well in the no-load operation and the load operation, and the stability of the system is guaranteed in the full speed range.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873789/10272303/10181099.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68150008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-12DOI: 10.30941/CESTEMS.2023.00041
Chengcheng Liu;Fan Yang;Wenfeng Zhang;Youhua Wang
Soft magnetic composite (SMC) material is an ideal soft magnetic material employed for developing 3D magnetic flux electromagnetic equipment, due to its advantages of 3D magnetic isotropy characteristic, low eddy current loss, and simple manufacturing process. The permanent magnet claw pole machine (PMCPM) with SMC cores is a good case that the SMC to be adopted for developing 3D flux electrical machines. In this paper, a novel axial-radial flux permanent magnet claw pole machine (ARPMCPM) with SMC cores and ferrite magnets is proposed. Compared with the traditional PMCPM, the proposed ARPMCPM is designed with only one spoke PM rotor and its whole structure is quite compact. For the performance prediction, the 3D finite element method (FEM) is used. Meanwhile, for the performance evaluation, a previously developed axial flux claw pole permanent magnet machine (AFCPM) is employed as the benchmark machine and all these machines are optimized by using the combined multilevel robust Taguchi method. It can be seen that the proposed ARPMCPM is with higher torque/weight density and operation efficiency.
{"title":"Design Optimization of a Novel Axial-Radial Flux Permanent Magnet Claw Pole Machine with SMC Cores and Ferrite Magnets","authors":"Chengcheng Liu;Fan Yang;Wenfeng Zhang;Youhua Wang","doi":"10.30941/CESTEMS.2023.00041","DOIUrl":"10.30941/CESTEMS.2023.00041","url":null,"abstract":"Soft magnetic composite (SMC) material is an ideal soft magnetic material employed for developing 3D magnetic flux electromagnetic equipment, due to its advantages of 3D magnetic isotropy characteristic, low eddy current loss, and simple manufacturing process. The permanent magnet claw pole machine (PMCPM) with SMC cores is a good case that the SMC to be adopted for developing 3D flux electrical machines. In this paper, a novel axial-radial flux permanent magnet claw pole machine (ARPMCPM) with SMC cores and ferrite magnets is proposed. Compared with the traditional PMCPM, the proposed ARPMCPM is designed with only one spoke PM rotor and its whole structure is quite compact. For the performance prediction, the 3D finite element method (FEM) is used. Meanwhile, for the performance evaluation, a previously developed axial flux claw pole permanent magnet machine (AFCPM) is employed as the benchmark machine and all these machines are optimized by using the combined multilevel robust Taguchi method. It can be seen that the proposed ARPMCPM is with higher torque/weight density and operation efficiency.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10181103","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84539763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-20DOI: 10.30941/CESTEMS.2023.00036
Shengnan Wu;Qifeng Zhao;Wenming Tong
In this paper, a new type of harmonic injection permanent magnet shape optimization method is proposed to suppress the torque ripple of surface-mounted permanent magnet synchronous motor. The sinusoidal waveform shaping of the axial section of the permanent magnet is added with the third harmonic shaping, and the sine wave and the third harmonic are derived. The optimal ratio is 6:1. The permanent magnet no shaping, sinusoidal shaping and sinusoidal combined third harmonic shaping are compared. The results show that the sinusoidal combined third harmonic shaping design can effectively suppress the torque ripple of the surface mounted permanent magnet synchronous motor and obtain a relatively large output torque. At the same time, a method of using permanent magnet segmentation to approximately equivalently replace sine combined with third harmonic shaping design is proposed, which effectively saves the manufacturing cost of permanent magnets and provides design and research ideas for more economical and effective optimization of surface-mounted permanent magnet motors.
{"title":"Permanent Magnet Axial Section Shaping Optimization Surface-Mounted Permanent Magnet Synchronous Motor","authors":"Shengnan Wu;Qifeng Zhao;Wenming Tong","doi":"10.30941/CESTEMS.2023.00036","DOIUrl":"10.30941/CESTEMS.2023.00036","url":null,"abstract":"In this paper, a new type of harmonic injection permanent magnet shape optimization method is proposed to suppress the torque ripple of surface-mounted permanent magnet synchronous motor. The sinusoidal waveform shaping of the axial section of the permanent magnet is added with the third harmonic shaping, and the sine wave and the third harmonic are derived. The optimal ratio is 6:1. The permanent magnet no shaping, sinusoidal shaping and sinusoidal combined third harmonic shaping are compared. The results show that the sinusoidal combined third harmonic shaping design can effectively suppress the torque ripple of the surface mounted permanent magnet synchronous motor and obtain a relatively large output torque. At the same time, a method of using permanent magnet segmentation to approximately equivalently replace sine combined with third harmonic shaping design is proposed, which effectively saves the manufacturing cost of permanent magnets and provides design and research ideas for more economical and effective optimization of surface-mounted permanent magnet motors.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10158483","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82965491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-20DOI: 10.30941/CESTEMS.2023.00033
Ling Feng;Zhaohui Wang;Jianghua Feng;Wensheng Song
In the field of high-power electric drives, multiphase motors have the advantages of high power-density, excellent fault tolerance and control flexibility. But their decoupling control and modulation process are much more complicated compared with three-phase motors due to the increased degree of freedom. Finite control set model predictive control can reduce the difficulties of controlling six-phase motors because it does not require modulation process. In this paper, a cascaded model predictive control strategy is proposed for the optimal control of high-power six-phase permanent magnet synchronous motors. Firstly, the current prediction model of torque and harmonic subspaces are established by decoupling the six-phase spatial variables. Secondly, a cascaded cost function with fault-tolerant capability is proposed to eliminate the weighting factor in the cost function. And finally, the proposed strategy is demonstrated through theoretical analysis and experiments. It is validated that the proposed method is able to maintain excellent steady-state control accuracy and fast dynamic response while significantly reduce the control complexity of the system. Besides, it can easily achieve fault-tolerant operation under open-phase fault.
{"title":"Cascaded Model Predictive Control of Six-Phase Permanent Magnet Synchronous Motor with Fault Tolerant Ability","authors":"Ling Feng;Zhaohui Wang;Jianghua Feng;Wensheng Song","doi":"10.30941/CESTEMS.2023.00033","DOIUrl":"https://doi.org/10.30941/CESTEMS.2023.00033","url":null,"abstract":"In the field of high-power electric drives, multiphase motors have the advantages of high power-density, excellent fault tolerance and control flexibility. But their decoupling control and modulation process are much more complicated compared with three-phase motors due to the increased degree of freedom. Finite control set model predictive control can reduce the difficulties of controlling six-phase motors because it does not require modulation process. In this paper, a cascaded model predictive control strategy is proposed for the optimal control of high-power six-phase permanent magnet synchronous motors. Firstly, the current prediction model of torque and harmonic subspaces are established by decoupling the six-phase spatial variables. Secondly, a cascaded cost function with fault-tolerant capability is proposed to eliminate the weighting factor in the cost function. And finally, the proposed strategy is demonstrated through theoretical analysis and experiments. It is validated that the proposed method is able to maintain excellent steady-state control accuracy and fast dynamic response while significantly reduce the control complexity of the system. Besides, it can easily achieve fault-tolerant operation under open-phase fault.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873789/10272303/10158482.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68150001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-20DOI: 10.30941/CESTEMS.2023.00031
Xiping Liu;Siting Zhu;Dabin Liu;Jianwei Liang
In this article, a new variable leakage flux reverse salient-pole motor (VLF-RSPM) is raised to widen the speed range. The innovation is to realize both reverse salient-pole characteristics and variable leakage flux characteristics by using a method of adding magnetic bridges and magnetic barriers. Firstly, the evolution of the topological structure and working principle of the motor are introduced. Secondly, based on 2D Finite Element Analysis (FEA), the electromagnetic properties and noise of the motor are analyzed in detail, and the electromagnetic properties are contrasted with that of the conventional V-type synchronous motor (CVTSM). The results show that VLF-RSPM has the advantages of small torque ripple, strong magnetic weakening ability, low noise, high efficiency, and low risk of permanent magnet demagnetization under different conditions. In addition, it is verified that the proposed motor extends the speed range.
{"title":"Design and Analysis of Wide Speed Regulation of Variable Leakage Flux Reverse Salient-Pole Motor","authors":"Xiping Liu;Siting Zhu;Dabin Liu;Jianwei Liang","doi":"10.30941/CESTEMS.2023.00031","DOIUrl":"https://doi.org/10.30941/CESTEMS.2023.00031","url":null,"abstract":"In this article, a new variable leakage flux reverse salient-pole motor (VLF-RSPM) is raised to widen the speed range. The innovation is to realize both reverse salient-pole characteristics and variable leakage flux characteristics by using a method of adding magnetic bridges and magnetic barriers. Firstly, the evolution of the topological structure and working principle of the motor are introduced. Secondly, based on 2D Finite Element Analysis (FEA), the electromagnetic properties and noise of the motor are analyzed in detail, and the electromagnetic properties are contrasted with that of the conventional V-type synchronous motor (CVTSM). The results show that VLF-RSPM has the advantages of small torque ripple, strong magnetic weakening ability, low noise, high efficiency, and low risk of permanent magnet demagnetization under different conditions. In addition, it is verified that the proposed motor extends the speed range.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873789/10272303/10158481.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68150009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-06DOI: 10.30941/CESTEMS.2023.00021
Lavanya Balasubramanian;Nurul Azim Bhuiyan;Asad Javied;Ashraf A. Fahmy;Fawzi Belblidia;Johann Sienz
This paper explores some design parameters of an interior permanent magnet synchronous motor that contribute to enhancing motor performance. Various geometry parameters such as magnet dimension, machine diameter, stator teeth height, and number of poles are analyzed to compare overall torque, power, and torque ripples in order to select the best design parameters and their ranges. Pyleecan, an open-source software, is used to design and optimize the motor for electric vehicle applications. Following optimization with Non-dominated Sorting Genetic Algorithm (NSGA-II), two designs A and B were obtained for two objective functions and the corresponding torque ripples values of the design A and B were later reduced by 32% and 77%. Additionally, the impact of different magnet grades on the output performances is analyzed.
{"title":"Design and Optimization of Interior Permanent Magnet (IPM) Motor for Electric Vehicle Applications","authors":"Lavanya Balasubramanian;Nurul Azim Bhuiyan;Asad Javied;Ashraf A. Fahmy;Fawzi Belblidia;Johann Sienz","doi":"10.30941/CESTEMS.2023.00021","DOIUrl":"https://doi.org/10.30941/CESTEMS.2023.00021","url":null,"abstract":"This paper explores some design parameters of an interior permanent magnet synchronous motor that contribute to enhancing motor performance. Various geometry parameters such as magnet dimension, machine diameter, stator teeth height, and number of poles are analyzed to compare overall torque, power, and torque ripples in order to select the best design parameters and their ranges. Pyleecan, an open-source software, is used to design and optimize the motor for electric vehicle applications. Following optimization with Non-dominated Sorting Genetic Algorithm (NSGA-II), two designs A and B were obtained for two objective functions and the corresponding torque ripples values of the design A and B were later reduced by 32% and 77%. Additionally, the impact of different magnet grades on the output performances is analyzed.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873789/10172142/10144998.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68147987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.30941/CESTEMS.2023.00042
Yaping Zhang;Jian Ge;Wei Xu;Hao Tang;Yang Gao;Xiaoliang Chen;Shihu Su;Zhen Bao
With advantages of strong drive capability, nested-loop secondary linear machine (NLS-LM) has great potentiality in linear metro. For its secondary structure with multiple loops, it is difficult to calculate the electromagnetic thrust of NLS-LM reasonably. Hence, in this paper, one thrust calculation method is proposed considering variable loop inductance and transient loop current. Firstly, to establish the secondary winding function, the modeling domain is confined to a limited range, and the equivalent loop span is employed by analyzing the coupling relationship between primary and secondary. Then, in order to obtain the secondary flux density, the transient secondary current is solved based on the loop impedance and induced voltage. Finally, the electromagnetic thrust can be calculated reasonably by the given primary current sheet and the calculated secondary flux density. Comprehensive simulations and experiments have demonstrated the effectiveness of the proposed method.
{"title":"Winding Function Theory Based Thrust Calculation on Nested-loop Secondary Linear Machine Adapted to Linear Metro","authors":"Yaping Zhang;Jian Ge;Wei Xu;Hao Tang;Yang Gao;Xiaoliang Chen;Shihu Su;Zhen Bao","doi":"10.30941/CESTEMS.2023.00042","DOIUrl":"https://doi.org/10.30941/CESTEMS.2023.00042","url":null,"abstract":"With advantages of strong drive capability, nested-loop secondary linear machine (NLS-LM) has great potentiality in linear metro. For its secondary structure with multiple loops, it is difficult to calculate the electromagnetic thrust of NLS-LM reasonably. Hence, in this paper, one thrust calculation method is proposed considering variable loop inductance and transient loop current. Firstly, to establish the secondary winding function, the modeling domain is confined to a limited range, and the equivalent loop span is employed by analyzing the coupling relationship between primary and secondary. Then, in order to obtain the secondary flux density, the transient secondary current is solved based on the loop impedance and induced voltage. Finally, the electromagnetic thrust can be calculated reasonably by the given primary current sheet and the calculated secondary flux density. Comprehensive simulations and experiments have demonstrated the effectiveness of the proposed method.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873789/10172142/10172145.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68147996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Content","authors":"","doi":"","DOIUrl":"https://doi.org/","url":null,"abstract":"","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873789/10172142/10172144.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68147997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-21DOI: 10.30941/CESTEMS.2023.00029
Mingjie Wang;Dawei Li;Ronghai Qu
Better torque performance and higher reliability have long been the focus of research for slotted limited-angle torque motors (LATMs), which are primarily used to position first-stage valves in electrohydraulic servosystems. This paper presents a high reliability axial-flux slotted LATM with quasi-Halbach array for torque performance improvement including constant torque range (CTR) and output torque. Firstly, the structure with two sets of windings and the operation principle of the proposed slotted LATM is analyzed. Secondly, a brief design procedure is presented, the structure selections of open slot and double-stator single-rotor (DSSR) interior rotor with surface mounted quasi-Halbach permanent magnet (PM) array are illustrated, and the geometric parameters are optimized to obtain the optimal design of the proposed slotted LATM. Then, 3-D finite-element method (FEM) is employed to compare the proposed slotted LATM with the conventional surface mounted PM slotted LATM in terms of cogging torque, no-load back EMF, and output torque, and the results show that the proposed LATM with quasi-Halbach array has a 10% improvement in output torque and a 25% improvement in CTR. Meanwhile, the flux linkages and torque performance of the two sets of windings under various conditions verify good magnetic isolation. Finally, prototypes of two different rotor types are manufactured and a series of experiments are performed to validate the analysis.
{"title":"Analysis of an Axial-Flux Slotted Limited-Angle Torque Motor with Quasi-Halbach Array for Torque Performance Improvement","authors":"Mingjie Wang;Dawei Li;Ronghai Qu","doi":"10.30941/CESTEMS.2023.00029","DOIUrl":"https://doi.org/10.30941/CESTEMS.2023.00029","url":null,"abstract":"Better torque performance and higher reliability have long been the focus of research for slotted limited-angle torque motors (LATMs), which are primarily used to position first-stage valves in electrohydraulic servosystems. This paper presents a high reliability axial-flux slotted LATM with quasi-Halbach array for torque performance improvement including constant torque range (CTR) and output torque. Firstly, the structure with two sets of windings and the operation principle of the proposed slotted LATM is analyzed. Secondly, a brief design procedure is presented, the structure selections of open slot and double-stator single-rotor (DSSR) interior rotor with surface mounted quasi-Halbach permanent magnet (PM) array are illustrated, and the geometric parameters are optimized to obtain the optimal design of the proposed slotted LATM. Then, 3-D finite-element method (FEM) is employed to compare the proposed slotted LATM with the conventional surface mounted PM slotted LATM in terms of cogging torque, no-load back EMF, and output torque, and the results show that the proposed LATM with quasi-Halbach array has a 10% improvement in output torque and a 25% improvement in CTR. Meanwhile, the flux linkages and torque performance of the two sets of windings under various conditions verify good magnetic isolation. Finally, prototypes of two different rotor types are manufactured and a series of experiments are performed to validate the analysis.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873789/10272303/10106622.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68150005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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