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Ping Zheng - One of the best experts on this subject based on the ideXlab platform.

  • Research on Thrust Fluctuation and Thermal Field of Tubular Permanent Magnet Linear Machine
    2019 22nd International Conference on Electrical Machines and Systems (ICEMS), 2019
    Co-Authors: Shijie Yang, Ping Zheng
    Abstract:

    A tubular permanent magnet Linear Machine (TPMLM) is designed for a free-piston Stirling power generating system. As the system requires high stability and dynamic performance of the Machine, a design method of stator teeth is introduced to reduce the thrust fluctuation and improve the Machine performances by changing the radial length and axial width of side teeth. Besides, the temperature field model of the proposed Machine based on finite element method (FEM) is established, and the validity of the design is verified.

  • Thermal analysis and experimental verification of a staggered-teeth transverse-flux permanent-magnet Linear Machine
    IET Electric Power Applications, 2018
    Co-Authors: Shukuan Zhang, Luming Cheng, Ping Zheng, Bin Yu, Mingqiao Wang
    Abstract:

    To overcome the inherent demerit of low power factor existing in transverse-flux permanent-magnet (TFPM) Machines, a tubular staggered-teeth TFPM Linear Machine is presented here. Linear alternator integrated with free-piston Stirling engines could offer a great potential in a wide variety of applications ranging from solar energy generation to space power supply. The thermal behaviour of the Machine is studied using a three-terminal lumped-parameter thermal network (LPTN) to solve the problem of temperature overestimation of the traditional LPTN. The determination of thermal resistances and thermal parameters are introduced in detail. The temperatures of various components of the Machine under different load conditions are calculated by both the three-terminal LPTN model and the numerical thermal model. Sensitivity analysis is carried out to study the influence of critical thermal parameters on the temperature rise of the Machine. On this basis, the effectiveness of the forced air cooling is investigated. A prototype is fabricated and temperature experiment indicates that there is a good agreement between measurement and calculation.

  • A tubular hybrid Halbach/axially-magnetized permanent-magnet Linear Machine
    AIP Advances, 2017
    Co-Authors: Luming Cheng, Ping Zheng
    Abstract:

    A single-phase tubular permanent-magnet Linear Machine (PMLM) with hybrid Halbach/axially-magnetized PM arrays is proposed for free-piston Stirling power generation system. Machine topology and operating principle are elaborately illustrated. With the sinusoidal speed characteristic of the free-piston Stirling engine considered, the proposed Machine is designed and calculated by finite-element analysis (FEA). The main structural parameters, such as outer radius of the mover, radial length of both the axially-magnetized PMs and ferromagnetic poles, axial length of both the middle and end radially-magnetized PMs, etc., are optimized to improve both the force capability and power density. Compared with the conventional PMLMs, the proposed Machine features high mass and volume power density, and has the advantages of simple control and low converter cost. The proposed Machine topology is applicable to tubular PMLMs with any phases.

  • Research on a tubular flux-switching permanent-magnet Linear Machine
    2017 20th International Conference on Electrical Machines and Systems (ICEMS), 2017
    Co-Authors: Ping Zheng, Guangyuan Qiao
    Abstract:

    A tubular flux-switching permanent-magnet Linear Machine (PMLM) is proposed and designed for free-piston energy converter. The influences of several main structure parameters on the Machine performances are investigated. The power, power density and efficiency are improved by optimizing the structure parameters. Further, characteristic of the detent force is studied and the detent force is reduced by choosing proper combinations of the structure parameters. Finally, with poor heat dissipating condition considered, thermal field distribution of the proposed Machine is evaluated by 3D finite element analysis (FEA), which ensures safe operation of the Machine.

  • Design and analysis of a single-phase oscillating permanent-magnet Linear Machine
    2017 20th International Conference on Electrical Machines and Systems (ICEMS), 2017
    Co-Authors: Mingqiao Wang, Guangyuan Qiao, Yuan Wang, Ping Zheng
    Abstract:

    Stirling power generating system, which has the advantages of multiple energies applicable and high efficiency, is promising for aerospace applications. As the main part of Stirling power generating system, single-phase oscillating permanent-magnet Linear Machine (PMLM) is investigated in this paper. Firstly, the electromagnetic performances, such as no-load back electromotive force (EMF) and thrust, are analyzed by finite element method. The influences of main parameters, including PM thickness, inner and outer diameter of mover iron core and tooth width, on performance are further investigated to obtain the optimal scheme. The proposed scheme can reach the power density of 0.177kW/kg. To ensure safe operation, the thermal field distribution law of the single-phase oscillating PMLM is investigated.

Bin Yu - One of the best experts on this subject based on the ideXlab platform.

  • Thermal analysis and experimental verification of a staggered-teeth transverse-flux permanent-magnet Linear Machine
    IET Electric Power Applications, 2018
    Co-Authors: Shukuan Zhang, Luming Cheng, Ping Zheng, Bin Yu, Mingqiao Wang
    Abstract:

    To overcome the inherent demerit of low power factor existing in transverse-flux permanent-magnet (TFPM) Machines, a tubular staggered-teeth TFPM Linear Machine is presented here. Linear alternator integrated with free-piston Stirling engines could offer a great potential in a wide variety of applications ranging from solar energy generation to space power supply. The thermal behaviour of the Machine is studied using a three-terminal lumped-parameter thermal network (LPTN) to solve the problem of temperature overestimation of the traditional LPTN. The determination of thermal resistances and thermal parameters are introduced in detail. The temperatures of various components of the Machine under different load conditions are calculated by both the three-terminal LPTN model and the numerical thermal model. Sensitivity analysis is carried out to study the influence of critical thermal parameters on the temperature rise of the Machine. On this basis, the effectiveness of the forced air cooling is investigated. A prototype is fabricated and temperature experiment indicates that there is a good agreement between measurement and calculation.

  • Thermal analysis of a novel cylindrical transverse-flux permanent-magnet Linear Machine
    Energies, 2015
    Co-Authors: Bin Yu, Shukuan Zhang, Jidong Yan, Luming Cheng, Ping Zheng
    Abstract:

    This paper presents a novel staggered-teeth cylindrical transverse-flux permanent-magnet Linear Machine (TFPMLM), which aims to improve the power factor and force density. Due to the compact structure and high performance requirement, thermal problems should be seriously considered. The three-dimensional (3-D) temperature field model is established. The determination of convection heat transfer coefficients is discussed. Equivalent thermal conductivities of stator core and winding are given to simplify the analysis. With the thermal effect of the adhesive coatings among permanent magnets (PMs) and mover yoke taken into account, the temperature field distribution and variation rules of the TFPMLM are obtained using the finite volume method (FVM). The influences of slot filling factor and air flow velocity on the temperature field distribution are analyzed. It is found that the hottest spot of the TFPMLM appears in the middle of the end winding; and there is no risk of demagnetization for PMs.

  • A novel single-phase flux-switching permanent magnet Linear generator used for free-piston Stirling engine
    Journal of Applied Physics, 2014
    Co-Authors: Ping Zheng, Yi Sui, Chengde Tong, Jingang Bai, Bin Yu, Fei Lin
    Abstract:

    This paper investigates a novel single-phase flux-switching permanent-magnet (PM) Linear Machine used for free-piston Stirling engines. The Machine topology and operating principle are studied. A flux-switching PM Linear Machine is designed based on the quasi-sinusoidal speed characteristic of the resonant piston. Considering the performance of back electromotive force and thrust capability, some leading structural parameters, including the air gap length, the PM thickness, the ratio of the outer radius of mover to that of stator, the mover tooth width, the stator tooth width, etc., are optimized by finite element analysis. Compared with conventional three-phase moving-magnet Linear Machine, the proposed single-phase flux-switching topology shows advantages in less PM use, lighter mover, and higher volume power density.

  • Flux leakage analysis of transverse-flux PM Linear Machine
    2014 17th International Conference on Electrical Machines and Systems (ICEMS), 2014
    Co-Authors: Bin Yu, Ping Zheng, Bing Xu, Jing Zhang
    Abstract:

    A novel cylindrical transverse-flux permanentmagnet Linear Machine (TFPMLM) is proposed in this paper. It aims to solve the problems of high flux leakage and low power factor existing in the traditional TFPMLM, with good manufacturability. As the main reason of low power factor, the flux leakage of transverse flux Machine is investigated. The flux leakages of different schemes are compared. A favorable scheme is achieved.

  • Research on a novel tubular transverse-flux permanent-magnet Linear Machine for free-piston energy converter
    2011 International Conference on Electrical Machines and Systems, 2011
    Co-Authors: Bin Yu, Chong Xiao, Zhiyi Song, Ping Zheng
    Abstract:

    This paper investigates a novel tubular transverse-flux permanent-magnet Linear Machine (TFPLM) for a free-piston energy converter, which has advantages in efficiency, emissions and reliability for serial hybrid electric vehicles. Most importantly, the novel structure solves the problems of low power factor and complex process which exist in conventional transverse-flux permanent-magnet Machines (TFPMs). In this paper, a staggered structure is applied for the adjacent stator teeth of a transverse-flux Machine. This kind of structure has two topologies: three phases in the axial direction and three phases in the circumference direction. To minimize flux leakage, stator and permanent magnet dimensions are optimized by three-dimensional finite-element method (3-D FEM). As the key technology of TFPMLM, the method to increase power factor and force density has been investigated. And low thrust fluctuation, high power factor and force density are achieved by further optimization. The simulation results prove that the Machine has both higher power factor and high efficiency.

Mei Zhao - One of the best experts on this subject based on the ideXlab platform.

  • Development and Analysis of Novel Flux-Switching Transverse-Flux Permanent Magnet Linear Machine
    IEEE Transactions on Industrial Electronics, 2019
    Co-Authors: Mei Zhao, Hongyong Yang, Mingming Xu, Guanlong Deng, Ping Zhang
    Abstract:

    The flux-switching transverse-flux permanent magnet Linear Machine (FSTFPMLM) is proposed in this paper, combining the advantages of the transverse-flux Linear Machine and the flux-switching Linear Machine. First, the structure and operating principle of the FSTFPMLM is presented. Second, the magnetic field of a simplified FSTFPMLM is numerically computed by the three-dimensional (3-D) finite-element method (FEM). Third, the thrust characteristics of the Machine, including the thrust force, cogging force, and force ripple, are numerically analyzed. The influence of structure parameters on the thrust characteristics has been analyzed by the 3-D FEM. The law of thrust, cogging force, and force ripple as the pole pitch ratio between primary and secondary, and the ratio between the tooth width and pole pitch of the secondary variable provides the guidance to design FSTFPMLM, which aims to achieve a larger thrust, smaller cogging and force ripple using less permanent magnet materials. The thrust force capabilities of FSTFPMLM are compared with other topologies of Linear Machines. Finally, the prototype and experimental setup have been developed, and the calculated results and the measured results are in good agreement.

  • Design and Reduction of Thrust Ripple in Transverse Flux Permanent Magnet Linear Machine
    2018 IEEE International Magnetics Conference (INTERMAG), 2018
    Co-Authors: Yu Shuail, Mei Zhao, Hongyong Yang, Ningiun Feng, Dianli Ho
    Abstract:

    This paper proposed a tubular transverse flux permanent magnet Linear Machine with the quasi-distributed stator segments, due to the problem of larger thrust force ripple in the Machine, which has some merits higher force density and better controllable characteristic etc. Firstly, the structure and operating principle of tubular transverse flux permanent magnet Linear Machine was presented. Secondly, the influence of the quasi-distributed stator segments on the motor performance is analyzed in detail. Special attention is paid to the Back-EMF, cogging force and electromagnetic force etc. The paper investigates the influence of different arrangements in the transverse flux permanent magnet Linear Machine, including theoretical analysis and numerical calculation. The results show that the thrust ripple can be decreased by the quasi-distributed stator segments in transverse flux permanent magnet Linear Machine.

  • Design and Reduction of Thrust Ripple in Transverse Flux Permanent Magnet Linear Machine
    2016 International Conference of Asian Union of Magnetics Societies (ICAUMS), 2016
    Co-Authors: Mei Zhao, Yunliang Zhang
    Abstract:

    This paper proposed a tubular transverse flux permanent magnet Linear Machine with the class distribution of the stator laminations group arrangement, due to the problem of larger thrust force ripple in the Machine, which has some merits higher force density and better controllable characteristic etc. Firstly, the structure and operating principle of tubular transverse flux permanent magnet Linear Machine was presented. Secondly, the influence of the class distribution of the stator laminations group arrangement on the motor performance is analyzed in detail. Special attention is paid to the Back-EMF, cogging force and electromagnetic force etc. The paper investigates the influence of different arrangements in transverse flux permanent magnet Linear Machine, including theoretical analysis and numerical calculation. The results show that the thrust ripple can be decreased by the class distribution of the stator laminations group arrangement in transverse flux permanent magnet Linear Machine.

  • The thermal characteristics investigation of transverse flux tubular Linear Machine for electromagnetic launcher
    2012 16th International Symposium on Electromagnetic Launch Technology, 2012
    Co-Authors: Mei Zhao, Ji Bin Zou, Yong-xiang Xu, Wei-yan Liang
    Abstract:

    This paper investigates the thermal characteristics of the transverse flux tubular Linear Machine (TFTLM) for electromagnetic launcher (EML), including numerical calculation and temperature rise in the short-time overload test. Firstly, it estimates the various components of heat sources i.e. electromagnetic losses, including core loss in the stator as well as copper loss and eddy-current losses in the mover, and then presents the heat parameters according to the convective heat exchanges. Secondly, it establishes numerical model of the three-dimensional (3-D) for the transient temperature field in TFTLM. The validity of the numerical analysis is proved by the temperature rise in the short-time overload test.

  • The thrust characteristic investigation of transverse flux tubular Linear Machine for electromagnetic launcher
    IEEE Transactions on Plasma Science, 2011
    Co-Authors: Mei Zhao, Ji Bin Zou, Ji Ming Zou, Yong-xiang Xu, Qian Wang
    Abstract:

    This paper investigates the thrust characteristics of the transverse flux tubular Linear Machine, including theoretical analysis and numerical calculation. The influence of structure parameters on the thrust force and cogging force characteristics is analyzed in detail. Special attention is paid to the length of stator segment, air-gap length, and pole-arc coefficient. The analysis results provide a foundation for the optimum design of electromagnetic launcher.

Hao Chen - One of the best experts on this subject based on the ideXlab platform.

  • A Novel Tubular Switched Reluctance Linear Machine Shielding From Longitudinal End Magnetic Effect
    IEEE Transactions on Applied Superconductivity, 2020
    Co-Authors: Hao Chen, Wenmin Zhao, Zhongzheng Yuan, Jiacheng Tian
    Abstract:

    Traditional Linear Machines are under great influence of longitudinal end effect because of their finite stacking lengths in transverse and longitudinal directions. Longitudinal end effect causes imbalance of phase performance so that Linear Machine's force fluctuation is aggravated. The negative impact of longitudinal end effect on a flat type switched reluctance Linear Machine (SRLM) is verified in this paper. In order to avoid this problem, a novel tubular switched reluctance Linear Machine (TSRLM) is proposed, which can shield from unexpected impact of end effect. In structure, there is no transverse cut in tubular Linear Machines, so tubular Linear Machines can evade the influence of the transverse end effect. The equivalent magnetic circuit of this TSRLM is analyzed in this paper, which proves that the TSRLM is also not influenced by longitudinal end effect. A prototype is manufactured, and its corresponding hardware platform is established. A series of simulations and experiments verify that there is no deviation performance among phases in the proposed TSRLM. Accordingly, the traditional longitudinal end effect in Linear Machines caused by longitudinal cuts can be thoroughly evaded in proposed TSRLM.

  • Three-Dimensional Magnetic Equivalent Circuit Research of Double-Sided Switched Reluctance Linear Machine
    IEEE Transactions on Applied Superconductivity, 2020
    Co-Authors: Hao Chen
    Abstract:

    This paper proposes a three-dimensional magnetic equivalent circuit (3D MEC) method to analyze the flux linkage characteristics and electromagnetic force characteristics of double-sided switched reluctance Linear Machine (DSRLM). The 3D finite element model (3D FEM) of DSRLM is established to analyze the magnetic field line distribution of the motor. The magnetic field distribution of two representative positions (unaligned and aligned position) is mainly analyzed, and the reluctance of each part was obtained by the magnetic flux tube method. According to the similarity principle, the magnetic flux tube with irregular shape is equivalent to a simple magnetic circuit that is easy to calculate. According to the similarity of the magnetic circuit and electric circuit, the 3D MEC model of DSRLM was established. The Gauss-Seidel iteration method is used in MATLAB to solve the flux linkage-current curves at two representative positions. Then the flux linkage curves calculated by the MEC method are compared with the 3D-FEM results and experimental results. After that, the flux linkage curves obtained by MEC are used to solve the electromagnetic force curves. And the electromagnetic force curves are compared with the curves obtained by FEM and experiment. It can be found that the error is within an acceptable range, indicating that the scheme is more feasible.

  • High-precision non-Linear modelling method for a switched reluctance Linear Machine by interpolation with using variant sigmoid function
    IET Electric Power Applications, 2020
    Co-Authors: Hao Chen, Haiying Wang, Shuyan Zhao, Xing Wang, Vitor Pires, João Martins, Yassen Gorbounov
    Abstract:

    This study presents a non-Linear modelling method for a switched reluctance Linear Machine (SRLM), which achieves high modelling precision while requiring no prior knowledge regarding the specific structural dimensions of an SRLM. The proposed modelling method provides accurate flux linkage data based on limited experimental measurements through an interpolation process using a variant sigmoid function. The accuracy of the interpolation process is further increased by considering mutual coupling among the three phases. The performance of the proposed method is validated experimentally by comparing it with the performances of the Fourier series method and the two-dimensional finite element method. The results demonstrate that the proposed method achieves greater modelling precision than the other methods considered in modelling an SRLM.

  • Flux Characteristics Analysis of a Double-Sided Switched Reluctance Linear Machine Under the Asymmetric Air Gap
    IEEE Transactions on Industrial Electronics, 2018
    Co-Authors: Hao Chen
    Abstract:

    This paper analyzes the flux characteristics and normal force of the double-sided switched reluctance Linear Machine (SRLM) under the asymmetric air gap. The magnetic equivalent circuit (MEC) of the Machine and the details of the flux paths configuration at six distinct mover positions under the asymmetric air gap are included. Then, six special mover position magnetization curves are calculated by solving the MEC with the method of Gauss-Seidel. The magnetic flux-linkage model and thrust model based on six distinct mover positions are established by analytical polynomial. Three-dimensional (3-D) finite-element method (FEM) simulation and the experimental study with the prototype hardware are carried out to validate the accuracy of the MEC model calculated for the flux linkage and normal force. The six distinct mover positions flux linkage and normal force calculated by the MEC are consistent with the 3-D FEM calculated data and experimental data. It indicates that the proposed method to calculate the flux linkage and the normal force is feasible and effective. The dynamic analysis is also conducted. The simulated phase current waveforms are also consistent with the experimental results. It indicates that the presented method can be used to simulate the phase current under the asymmetry air gap effectively. The normal force under different asymmetry rates is analyzed, which provides the theoretical basis for reducing the unbalanced force of the double-sided SRLM.

  • Electromagnetic Analysis of Flux Characteristics of Double-Sided Switched Reluctance Linear Machine
    IEEE Transactions on Applied Superconductivity, 2016
    Co-Authors: Hao Chen, Qian Wang
    Abstract:

    This paper analyzed the flux characteristics of the double-sided switched reluctance Linear Machine. The magnetic equivalent circuit is given. The magnetization curves at six special mover positions are respectively calculated by the flux tube method, the magnetic flux paths distribution of air gap segments are presented, and the details of the magnetic reluctance component of each path are described. The calculated magnetization curves at six special mover positions is used as the switches for training the magnetic flux linkage model based on the BP neural networks with a GA algorithm. The mathematical mapping relationship between the mover position and the phase current to the magnetic flux linkage is established, and the magnetic flux linkage at certain mover position and certain phase current is calculated by the mathematical mapping relationship. Simulation and the experimental study with the prototype hardware are carried out on the magnetization curves at six special mover positions and three velocities of the mover. It is shown that the magnetization curves at six special mover positions calculated by magnetic equivalent circuit are consistent with the 3-D FEM calculated data and the experimental data, and the simulated phase current waveforms are also consistent with the experimental results. The magnetic equivalent circuit, the analytical calculation of the magnetization curves at six special mover positions, and the BP neural networks magnetic flux linkage model with GA algorithm are validated.

Qinfen Lu - One of the best experts on this subject based on the ideXlab platform.

  • A Novel Doubly-Fed Flux Reversal Linear Machine With Armature Windings Wound on Both Stator and Mover Teeth
    IEEE Access, 2020
    Co-Authors: Manying Chen, Lijian Wu, Liu Zhang, Qinfen Lu
    Abstract:

    A novel doubly-fed flux reversal Linear Machine (DF-FRLM) is proposed in this paper, which has two sets of armature windings wound on stator and mover teeth, respectively. The proposed DF-FRLM can exhibit significantly higher thrust force than the conventional FRLM by fully utilizing the stator slot space. The configuration and operation principle of a 6/5 mover/stator-pole DF-FRLM are described. In order to obtain maximum thrust force, the major design parameters of both conventional FRLM and proposed DF-FRLM are optimized by 2D finite element (FE) method. The optimized DF-FRLM and FRLM are investigated and compared in terms of the electromagnetic performance. It is found that the average thrust force of the optimized DF-FRLM is 1.23 times that of the optimized FRLM. In addition, the optimized DF-FRLM can achieve 34.4% higher average thrust force compared to the conventional FRLM whose geometry parameters are the same as that of the optimized DF-FRLM. Furthermore, a periodic model of the DF-FRLM is used to analyze the influence of the longitudinal end effect on the Machine electromagnetic performance. Finally, experimentation is carried out to verify the 2D FE simulation result.

  • A Novel Hybrid-Excitation Switched-Flux Linear Machine With Partitioned-Excitations
    IEEE Transactions on Magnetics, 2019
    Co-Authors: Zhiqiang Zeng, Qinfen Lu
    Abstract:

    This article proposes a novel hybrid-excitation switched-flux Linear Machine with partitioned-excitations (PE-HESFLM), which places the armature windings and field winding into different primaries. It can be geometrically taken as the combination of a conventional flux-switching Linear Machine and an additional primary for accommodating the field winding. Therefore, the proposed Machine can exhibit increased armature and field slot areas so that the competition for space between these two winding types is effectively mitigated, which in return translates to improved thrust density and flux-adjusting capability. First, the configurations of the proposed PE-HESFLM are introduced, following which different slot/pole combinations are globally optimized based on genetic algorithm (GA). Finally, the electromagnetic performances are comparatively investigated. It is shown that the proposed Machine can effectively improve the thrust density and flux-adjusting capability, so that the proposed Machine configuration is a particularly good candidate for applications which require wide-speed capability.

  • Investigation of a Partitioned-Primary Hybrid-Excited Flux-Switching Linear Machine With Dual-PM
    IEEE Transactions on Industry Applications, 2019
    Co-Authors: Zhiqiang Zeng, Qinfen Lu, Yiming Shen, Bocheng Wu, David Gerada, Christopher Gerada
    Abstract:

    A novel partitioned-primary hybrid-excited flux-switching Linear Machine with dual-PM excitation (DP-PPHEFSLM) is proposed and investigated in this paper. Unlike conventional single-primary hybrid-excited topologies, this proposed topology separates armature windings and field windings into two different parts of the partitioned-primary, with each part also having sandwiched or buried PMs. Due to greatly increased armature and field slot areas, it thus solves the problem of a crowded primary, which is typically encountered with conventional structures. Besides, the thrust density is further increased by skillfully positioning PMs on both primary parts. In this paper, first, the topology, operation principles, and viable primary/secondary pole-number combinations of the proposed Machine are elaborately addressed. Based on 2D finite-element method (FEM), the proposed Machines are globally optimized using genetic algorithms and their electromagnetic performances further investigated. Moreover, the proposed Machine is compared with conventional topologies in terms of electromagnetic performances, which shows that the proposed Machine exhibits multiple merits such as higher thrust density, improved space utilization, and more flexible flux control capability. Finally, a 6/7 DP-PPHEFSLM prototype Machine is manufactured and tested to validate the 2D FEM-predicted results.

  • A Novel Tubular Partitioned Stator Flux-Reversal Permanent Magnet Linear Machine for Direct-Drive Wave Energy Generation
    IEEE Transactions on Magnetics, 2019
    Co-Authors: Lei Zhao, Qinfen Lu
    Abstract:

    A novel tubular partitioned stator flux-reversal permanent magnet Linear Machine (PS-FRPMLM) is proposed for direct-drive wave energy generation. It consists of four flat PS-FRPMLMs and a moving aluminum tube, which not only combines the merits of permanent magnet Machines and flux-reversal Machines but also overcomes the space constraint between the permanent magnets and electric loadings. First, the topology and the operation principle are presented. Then, the proposed Machines with different slot/pole combinations, i.e., 6/4, 6/5, 6/7, and 6/8, are optimized to obtain the maximum no-load electromotive force (EMF). Furthermore, the performances of these proposed Machines are compared with those of conventional tubular FRPMLMs in both no-load and on-load states. The results show that this novel structure possesses lower cogging force, better PM utilization, and higher efficiency in the on-load state, which proves it to be suitable for application in direct-drive wave energy generation. Finally, a prototype of a single flat PS-FRPMLM is tested to verify the predicted finite element (FE) results.

  • Analysis of a Novel Double-sided Dual-PM Hybrid-excitation Switched-flux Linear Machine.
    2018 IEEE International Magnetics Conference (INTERMAG), 2018
    Co-Authors: Zhiqiang Zeng, Qinfen Lu
    Abstract:

    Hybrid-excitation switched-flux Linear Machine (HESFLM) has been studied increasingly due to the advantages of high force density, flexible flux controllability, robust secondary, etc. Existing HEFSLM structures have excitation winding, armature winding, and PMs entirely accommodated on the single-primary [1], [2]. Consequently, both flux-regulation capability and PM force density are restricted. In order to solve the aforementioned problem, this paper proposes a novel double-sided dual-PM HESFLM (DSDP-HESFLM) featuring dual-PM and double-sided primaries, hence both excitation and armature windings can be separately amounted with corresponding slot areas augmented simultaneously [3-5]. As a result, electromagnetic performances can be improved effectively. Based on 2-D finite-element (FE) analysis, the operating principles of the proposed Machine from both generator- and motor-oriented perspectives are systematically investigated, and then its electromagnetic performances are studied.

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