Pub Date : 2023-01-30DOI: 10.30941/CESTEMS.2023.00015
Liang Xu;Yang Li;Wenxiang Zhao;Guohai Liu
This paper proposes a new consequent-pole permanent magnet vernier machine (CPMVM), which can be regarded as a combination of two conventional CPMVM with opposite polarities. Based on the simplified axial magnetic circuit model, it is verified that the proposed CPMVM can reduce the unipolar leakage flux. In order to reduce the torque ripple of machine and improve the output torque of machine, the flux barrier is placed on the rotor of the proposed machine. Then, the parameters of the proposed CPMVM are optimized and determined. Moreover, the electromagnetic performance, including no-load air-gap flux density, average torque and torque ripple, flux linkage, back-electromotive force, cogging torque, average torque, torque ripple, power factor and loss, is compared with conventional surface-mounted permanent magnet vernier machine (SPMVM) and CPMVM. Finally, it is demonstrated that proposed CPMVM with flux barrier can effectively reduce the unipolar leakage flux and greatly reduce the torque ripple of machine. Also, compared with the SPMVM, the proposed CPMVM with flux barrier saves more than 45% of the permanent magnet material without reducing output torque.
{"title":"Reduction of Unipolar Leakage Flux and Torque Ripple in Consequent-pole PM Vernier Machine","authors":"Liang Xu;Yang Li;Wenxiang Zhao;Guohai Liu","doi":"10.30941/CESTEMS.2023.00015","DOIUrl":"https://doi.org/10.30941/CESTEMS.2023.00015","url":null,"abstract":"This paper proposes a new consequent-pole permanent magnet vernier machine (CPMVM), which can be regarded as a combination of two conventional CPMVM with opposite polarities. Based on the simplified axial magnetic circuit model, it is verified that the proposed CPMVM can reduce the unipolar leakage flux. In order to reduce the torque ripple of machine and improve the output torque of machine, the flux barrier is placed on the rotor of the proposed machine. Then, the parameters of the proposed CPMVM are optimized and determined. Moreover, the electromagnetic performance, including no-load air-gap flux density, average torque and torque ripple, flux linkage, back-electromotive force, cogging torque, average torque, torque ripple, power factor and loss, is compared with conventional surface-mounted permanent magnet vernier machine (SPMVM) and CPMVM. Finally, it is demonstrated that proposed CPMVM with flux barrier can effectively reduce the unipolar leakage flux and greatly reduce the torque ripple of machine. Also, compared with the SPMVM, the proposed CPMVM with flux barrier saves more than 45% of the permanent magnet material without reducing output torque.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":"7 1","pages":"35-44"},"PeriodicalIF":0.0,"publicationDate":"2023-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873789/10091481/10032060.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68173250","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 : 2023-01-17DOI: 10.30941/CESTEMS.2023.00002
Zhaoyang Qu;Zhuoran Zhang;Jincai Li;Heng Shi
In order to enhance the transient performance of aircraft high voltage DC (HVDC) generation system with wound rotor synchronous machine (WRSM) under a wide speed range, the nonlinear PI multi-loop control strategy is proposed in this paper. Traditional voltage control method is hard to achieve the dynamic performance requirements of the HVDC generation system under a wide speed range, so the nonlinear PI parameter adjustment, load current feedback and speed feedback are added to the voltage and excitation current double loop control. The transfer function of the HVDC generation system is derived, and the relationship between speed, load current and PI parameters is obtained. The PI parameters corresponding to the load at certain speed are used to shorten the adjusting time when the load suddenly changes. The dynamic responses in transient processes are analyzed by experiment. The results illustrate that the WRSM HVDC generator system with this method has better dynamic performance.
{"title":"Investigation of Nonlinear PI Multi-loop Control Strategy for Aircraft HVDC Generator System with Wound Rotor Synchronous Machine","authors":"Zhaoyang Qu;Zhuoran Zhang;Jincai Li;Heng Shi","doi":"10.30941/CESTEMS.2023.00002","DOIUrl":"https://doi.org/10.30941/CESTEMS.2023.00002","url":null,"abstract":"In order to enhance the transient performance of aircraft high voltage DC (HVDC) generation system with wound rotor synchronous machine (WRSM) under a wide speed range, the nonlinear PI multi-loop control strategy is proposed in this paper. Traditional voltage control method is hard to achieve the dynamic performance requirements of the HVDC generation system under a wide speed range, so the nonlinear PI parameter adjustment, load current feedback and speed feedback are added to the voltage and excitation current double loop control. The transfer function of the HVDC generation system is derived, and the relationship between speed, load current and PI parameters is obtained. The PI parameters corresponding to the load at certain speed are used to shorten the adjusting time when the load suddenly changes. The dynamic responses in transient processes are analyzed by experiment. The results illustrate that the WRSM HVDC generator system with this method has better dynamic performance.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":"7 1","pages":"92-99"},"PeriodicalIF":0.0,"publicationDate":"2023-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873789/10091481/10018847.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68171832","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}
This paper is an introduction to mesh based generated reluctance network modeling using triangular elements. Many contributions on mesh based generated reluctance networks using rectangular shaped elements have been published, but very few on those generated from a mesh using triangular elements. The use of triangular elements is aimed at extending the application of the approach to any shape of modeled devices. Basic concepts of the approach are presented in the case of electromagnetic devices. The procedure for coding the approach in the case of a flat linear permanent magnet machine is presented. Codes developed under MATLAB environment are also included.
{"title":"Introduction to Mesh Based Generated Lumped Parameter Models for Electromagnetic Problems using Triangular Elements","authors":"Haidar Diab;Salim Asfirane;Nicolas Bracikowski;Frédéric Gillon;Yacine Amara","doi":"10.30941/CESTEMS.2023.00012","DOIUrl":"https://doi.org/10.30941/CESTEMS.2023.00012","url":null,"abstract":"This paper is an introduction to mesh based generated reluctance network modeling using triangular elements. Many contributions on mesh based generated reluctance networks using rectangular shaped elements have been published, but very few on those generated from a mesh using triangular elements. The use of triangular elements is aimed at extending the application of the approach to any shape of modeled devices. Basic concepts of the approach are presented in the case of electromagnetic devices. The procedure for coding the approach in the case of a flat linear permanent magnet machine is presented. Codes developed under MATLAB environment are also included.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":"7 1","pages":"21-34"},"PeriodicalIF":0.0,"publicationDate":"2023-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873789/10091481/10018857.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68173248","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 : 2023-01-17DOI: 10.30941/CESTEMS.2023.00010
Da Li;XuSheng Wu;Wei Gao;Di Luo;Jianxin Gao
The demand for electric vehicles has increased over the past few years. Wireless power transfer for electric vehicles provides more flexibility than traditional plug-in charging technology. Charging couplers are critical components in wireless power transfer systems. The thermal effect produced by the magnetic coupler in work will cause the temperature of the device to rise rapidly, affecting the work efficiency, transfer power, operation reliability, and service life. This paper modeled and analyzed each component's temperature distribution characteristics and thermal behavior. Firstly, the magnetic coupler's mutual inductance and magnetic circuit model are established, and the thermal model of the magnetic coupler analyzes the heat generation process. The thermal models of the coupler under three different magnetic core distributions are established, and the temperature rise of each component is obtained. The temperature rise of different parts of the coupler is verified by the temperature rise test structure of the experiment.
{"title":"Coupler Loss Analysis of Magnetically Coupled Resonant Wireless Power Transfer System","authors":"Da Li;XuSheng Wu;Wei Gao;Di Luo;Jianxin Gao","doi":"10.30941/CESTEMS.2023.00010","DOIUrl":"https://doi.org/10.30941/CESTEMS.2023.00010","url":null,"abstract":"The demand for electric vehicles has increased over the past few years. Wireless power transfer for electric vehicles provides more flexibility than traditional plug-in charging technology. Charging couplers are critical components in wireless power transfer systems. The thermal effect produced by the magnetic coupler in work will cause the temperature of the device to rise rapidly, affecting the work efficiency, transfer power, operation reliability, and service life. This paper modeled and analyzed each component's temperature distribution characteristics and thermal behavior. Firstly, the magnetic coupler's mutual inductance and magnetic circuit model are established, and the thermal model of the magnetic coupler analyzes the heat generation process. The thermal models of the coupler under three different magnetic core distributions are established, and the temperature rise of each component is obtained. The temperature rise of different parts of the coupler is verified by the temperature rise test structure of the experiment.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":"7 1","pages":"63-72"},"PeriodicalIF":0.0,"publicationDate":"2023-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873789/10091481/10018855.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68173246","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 : 2023-01-17DOI: 10.30941/CESTEMS.2023.00004
Yiyan Su;Deliang Liang;Peng Kou
The most critical obstacle for four-wheel independently driven electric vehicles (4WID-EVs) is the driving range. Being the actuators of 4WID-EVs, motors account for its major power consumption. In this sense, by properly distributing torques to minimize the power consumption, the driving range of 4WID-EV can be effectively improved. This paper proposes a model predictive control (MPC)-based torque distribution scheme, which minimizes the power consumption of 4WID-EVs while guaranteeing its tracking performance of planar motions. By incorporating the motor model considering iron losses, the optimal torque distribution can be achieved without an additional torque controller. Also, for this reason, the proposed control scheme is computationally efficient, since the power consumption term to be optimized, which is expressed as the product of the motor voltages and currents, is much simpler than that derived from the efficiency map. With reasonable simplification and linearization, the MPC problem is converted to a quadratic programming problem, which can be solved efficiently. The simulation results in MATLAB and CarSim co-simulation environments demonstrate that the proposed scheme effectively reduces power consumption with guaranteed tracking performance.
{"title":"MPC-based Torque Distribution for Planar Motion of Four-wheel Independently Driven Electric Vehicles: Considering Motor Models and Iron Losses","authors":"Yiyan Su;Deliang Liang;Peng Kou","doi":"10.30941/CESTEMS.2023.00004","DOIUrl":"https://doi.org/10.30941/CESTEMS.2023.00004","url":null,"abstract":"The most critical obstacle for four-wheel independently driven electric vehicles (4WID-EVs) is the driving range. Being the actuators of 4WID-EVs, motors account for its major power consumption. In this sense, by properly distributing torques to minimize the power consumption, the driving range of 4WID-EV can be effectively improved. This paper proposes a model predictive control (MPC)-based torque distribution scheme, which minimizes the power consumption of 4WID-EVs while guaranteeing its tracking performance of planar motions. By incorporating the motor model considering iron losses, the optimal torque distribution can be achieved without an additional torque controller. Also, for this reason, the proposed control scheme is computationally efficient, since the power consumption term to be optimized, which is expressed as the product of the motor voltages and currents, is much simpler than that derived from the efficiency map. With reasonable simplification and linearization, the MPC problem is converted to a quadratic programming problem, which can be solved efficiently. The simulation results in MATLAB and CarSim co-simulation environments demonstrate that the proposed scheme effectively reduces power consumption with guaranteed tracking performance.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":"7 1","pages":"45-53"},"PeriodicalIF":0.0,"publicationDate":"2023-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873789/10091481/10018849.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68173249","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 : 2023-01-17DOI: 10.30941/CESTEMS.2023.00001
Can Tan;Wei Liu;Yingying Rao;Weizhao Tang;Libing Jing
In order to improve the operation efficiency of coaxial magnetic gear (CMG), in this paper, a CMG model with slotted in magnetic modulation ring is proposed. In this model, the permanent magnets (PMs) of internal and external rotors are distributed in Halbach array, the inner rotor PMs are equally divided into 3 small pieces, and the outer rotor PMs are equally divided into 2 small pieces. At the same time, the static magnetic modulation ring iron blocks are slotted, each iron block has 3 slots, the width of the slot is 0.4°, and the depth of the single side slot is 1mm. Finally, a two-dimensional model is established, and the eddy current loss and iron loss of the model are optimized, compared with the conventional CMG model, it is found that the changed pattern can increase the internal and external output torque by 4% and 4.12%, respectively. The eddy current loss is reduced by 66.57%, and the iron loss is reduced by 8.9%, which significantly improve the operation efficiency of the CMG.
{"title":"Loss Analysis of Magnetic Gear with Slotted in Magnetic Modulation Ring","authors":"Can Tan;Wei Liu;Yingying Rao;Weizhao Tang;Libing Jing","doi":"10.30941/CESTEMS.2023.00001","DOIUrl":"https://doi.org/10.30941/CESTEMS.2023.00001","url":null,"abstract":"In order to improve the operation efficiency of coaxial magnetic gear (CMG), in this paper, a CMG model with slotted in magnetic modulation ring is proposed. In this model, the permanent magnets (PMs) of internal and external rotors are distributed in Halbach array, the inner rotor PMs are equally divided into 3 small pieces, and the outer rotor PMs are equally divided into 2 small pieces. At the same time, the static magnetic modulation ring iron blocks are slotted, each iron block has 3 slots, the width of the slot is 0.4°, and the depth of the single side slot is 1mm. Finally, a two-dimensional model is established, and the eddy current loss and iron loss of the model are optimized, compared with the conventional CMG model, it is found that the changed pattern can increase the internal and external output torque by 4% and 4.12%, respectively. The eddy current loss is reduced by 66.57%, and the iron loss is reduced by 8.9%, which significantly improve the operation efficiency of the CMG.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":"7 1","pages":"110-117"},"PeriodicalIF":0.0,"publicationDate":"2023-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873789/10091481/10018606.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68171834","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 : 2023-01-17DOI: 10.30941/CESTEMS.2023.00011
Yunlu Li;Guiqing Ma;Junyou Yang;Yan Xu
Since the high penetration of renewable energy complicates the dynamic characteristics of the AC power electronic system (ACPES), it is essential to establish an accurate dynamic model to obtain its dynamic behavior for ensure the safe and stable operation of the system. However, due to the no or limited internal control details, the state-space modeling method cannot be realized. It leads to the ACPES system becoming a black-box dynamic system. The dynamic modeling method based on deep neural network can simulate the dynamic behavior using port data without obtaining internal control details. However, deep neural network modeling methods are rarely systematically evaluated. In practice, the construction of neural network faces the selection of massive data and various network structure parameters. However, different sample distributions make the trained network performance quite different. Different network structure hyperparameters also mean different convergence time. Due to the lack of systematic evaluation and targeted suggestions, neural network modeling with high precision and high training speed cannot be realized quickly and conveniently in practical engineering applications. To fill this gap, this paper systematically evaluates the deep neural network from sample distribution and structural hyperparameter selection. The influence on modeling accuracy is analyzed in detail, then some modeling suggestions are presented. Simulation results under multiple operating points verify the effectiveness of the proposed method.
{"title":"Systematic Evaluation of Deep Neural Network Based Dynamic Modeling Method for AC Power Electronic System","authors":"Yunlu Li;Guiqing Ma;Junyou Yang;Yan Xu","doi":"10.30941/CESTEMS.2023.00011","DOIUrl":"https://doi.org/10.30941/CESTEMS.2023.00011","url":null,"abstract":"Since the high penetration of renewable energy complicates the dynamic characteristics of the AC power electronic system (ACPES), it is essential to establish an accurate dynamic model to obtain its dynamic behavior for ensure the safe and stable operation of the system. However, due to the no or limited internal control details, the state-space modeling method cannot be realized. It leads to the ACPES system becoming a black-box dynamic system. The dynamic modeling method based on deep neural network can simulate the dynamic behavior using port data without obtaining internal control details. However, deep neural network modeling methods are rarely systematically evaluated. In practice, the construction of neural network faces the selection of massive data and various network structure parameters. However, different sample distributions make the trained network performance quite different. Different network structure hyperparameters also mean different convergence time. Due to the lack of systematic evaluation and targeted suggestions, neural network modeling with high precision and high training speed cannot be realized quickly and conveniently in practical engineering applications. To fill this gap, this paper systematically evaluates the deep neural network from sample distribution and structural hyperparameter selection. The influence on modeling accuracy is analyzed in detail, then some modeling suggestions are presented. Simulation results under multiple operating points verify the effectiveness of the proposed method.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":"7 2","pages":"137-143"},"PeriodicalIF":0.0,"publicationDate":"2023-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873789/10172142/10018856.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68147992","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}
In view of the large current peak and torque ripple in the actual current chopping control of switched reluctance motor, a segmented PWM duty cycle analysis method of switched reluctance motor based on current chopping control is proposed in this paper. The method realizes the control of the winding current by adjusting the average voltage of the two ends of the winding in one cycle through the PWM duty cycle. At the same time, according to the inductance linear model, the conduction phase is divided into a small inductance region and an inductance rising region, and the analytical formulas of PWM duty cycle in the two regions are deduced respectively. Finally, through matlab/simulink simulation and motor platform experiment, the current chopping control is compared with the segmented PWM duty cycle analysis method in this paper. Simulation and experimental results show that the segmented PWM duty cycle analysis method can effectively reduce the current peak and torque ripple, and has high practical application value.
{"title":"An Analytic Method of Segmented PWM Duty Cycle for Switched Reluctance Motor","authors":"Chaozhi Huang;Yuliang Wu;Hongwei Yuan;Wensheng Cao;Yongmin Geng","doi":"10.30941/CESTEMS.2023.00008","DOIUrl":"https://doi.org/10.30941/CESTEMS.2023.00008","url":null,"abstract":"In view of the large current peak and torque ripple in the actual current chopping control of switched reluctance motor, a segmented PWM duty cycle analysis method of switched reluctance motor based on current chopping control is proposed in this paper. The method realizes the control of the winding current by adjusting the average voltage of the two ends of the winding in one cycle through the PWM duty cycle. At the same time, according to the inductance linear model, the conduction phase is divided into a small inductance region and an inductance rising region, and the analytical formulas of PWM duty cycle in the two regions are deduced respectively. Finally, through matlab/simulink simulation and motor platform experiment, the current chopping control is compared with the segmented PWM duty cycle analysis method in this paper. Simulation and experimental results show that the segmented PWM duty cycle analysis method can effectively reduce the current peak and torque ripple, and has high practical application value.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":"7 2","pages":"163-170"},"PeriodicalIF":0.0,"publicationDate":"2023-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873789/10172142/10018853.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68147994","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 : 2023-01-17DOI: 10.30941/CESTEMS.2023.00009
Lei Yuan;Yunhao Jiang;Lu Xiong;Pan Wang
The research on high-performance vector control of permanent magnet synchronous motor (PMSM) drive system plays an extremely important role in electrical drive system. To further improve the speed control performance of the system, a fast non-singular end sliding mode (FNTSM) surface function based on traditional NTSM control is developed. The theoretical analysis proves that the FNTSM surface function has a faster dynamic response and more finite-time convergence. In addition, for the self-vibration problem caused by high sliding mode switching gain, an FNTSM control method with anti-disturbance capability was designed based on the linear disturbance observer (DO), i.e. the FNTSMDO method was employed to devise the PMSM speed regulator. The comparative simulation and experiment results with traditional PI control and NTSM control methods indicate that the FNTSMDO method could improve the dynamic performance and anti-interference of the system.
{"title":"Sliding Mode Control Approach with Integrated Disturbance Observer for PMSM Speed System","authors":"Lei Yuan;Yunhao Jiang;Lu Xiong;Pan Wang","doi":"10.30941/CESTEMS.2023.00009","DOIUrl":"https://doi.org/10.30941/CESTEMS.2023.00009","url":null,"abstract":"The research on high-performance vector control of permanent magnet synchronous motor (PMSM) drive system plays an extremely important role in electrical drive system. To further improve the speed control performance of the system, a fast non-singular end sliding mode (FNTSM) surface function based on traditional NTSM control is developed. The theoretical analysis proves that the FNTSM surface function has a faster dynamic response and more finite-time convergence. In addition, for the self-vibration problem caused by high sliding mode switching gain, an FNTSM control method with anti-disturbance capability was designed based on the linear disturbance observer (DO), i.e. the FNTSMDO method was employed to devise the PMSM speed regulator. The comparative simulation and experiment results with traditional PI control and NTSM control methods indicate that the FNTSMDO method could improve the dynamic performance and anti-interference of the system.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":"7 1","pages":"118-127"},"PeriodicalIF":0.0,"publicationDate":"2023-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873789/10091481/10018854.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68171835","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 : 2023-01-17DOI: 10.30941/CESTEMS.2023.00006
Tingting Jiang;Liang Xu;Jinghua Ji;Wenxiang Zhao
As members of doubly salient magnetless linear machines, linear variable flux reluctance (LVFR) and wound field flux reversal (LWFFR) machines inherit the merits of conventional magnetless linear machines such as low cost, high flux adjustment capability and high reliability. Furthermore, like linear switched reluctance machine, they have a very simple and compact long secondary, which are very attractive for long stroke applications. However, low force capability is their major defect. To solve this issue, new LVFR and LWFFR machine topologies were proposed in recent work, while lacking studies on their force improvement mechanism and further force evaluation. In this paper, LVFR and LWFFR machines with improved force performance are comparatively studied with the emphasis on their force capabilities. The operation principle of the two machines is analyzed based on magnetic field harmonics produced by flux modulation. Contributions of air-gap flux density harmonic components to no-load back electromagnetic forces of the two machines are analyzed and the average force equation is derived. Moreover, force capabilities of the both machines are investigated by means of the time-stepping finite-element analysis to verify the theoretical analysis.
{"title":"Comparative Study of Linear Variable Flux Reluctance Machine with Linear Wound Field Flux Reversal Machine","authors":"Tingting Jiang;Liang Xu;Jinghua Ji;Wenxiang Zhao","doi":"10.30941/CESTEMS.2023.00006","DOIUrl":"https://doi.org/10.30941/CESTEMS.2023.00006","url":null,"abstract":"As members of doubly salient magnetless linear machines, linear variable flux reluctance (LVFR) and wound field flux reversal (LWFFR) machines inherit the merits of conventional magnetless linear machines such as low cost, high flux adjustment capability and high reliability. Furthermore, like linear switched reluctance machine, they have a very simple and compact long secondary, which are very attractive for long stroke applications. However, low force capability is their major defect. To solve this issue, new LVFR and LWFFR machine topologies were proposed in recent work, while lacking studies on their force improvement mechanism and further force evaluation. In this paper, LVFR and LWFFR machines with improved force performance are comparatively studied with the emphasis on their force capabilities. The operation principle of the two machines is analyzed based on magnetic field harmonics produced by flux modulation. Contributions of air-gap flux density harmonic components to no-load back electromagnetic forces of the two machines are analyzed and the average force equation is derived. Moreover, force capabilities of the both machines are investigated by means of the time-stepping finite-element analysis to verify the theoretical analysis.","PeriodicalId":100229,"journal":{"name":"CES Transactions on Electrical Machines and Systems","volume":"7 1","pages":"73-80"},"PeriodicalIF":0.0,"publicationDate":"2023-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873789/10091481/10018851.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68173245","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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