Flux leakage analysis of transverse-flux PM linear machine

Yu, Bin; Zheng, Ping; Xu, Bing; Zhang, Jing; Han, Li

doi:10.1109/icems.2014.7013879

Cited by 2 publications

(4 citation statements)

References 7 publications

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“…Therefore, many optimization researches have been conducted to overcome these drawbacks. The flux leakage analysis of the TFPMLEMs pointed out that reduction of the armature flux leakage can increase the power factor, and different stator topologies are investigated [16,30]. During the design process, a three dimensional (3D) finite element analysis (FEA) is necessary due to the complex geometry and fully 3D flux path [31].…”

Section: Different Flux Type Permanent Magnet Lemsmentioning

confidence: 99%

A Review of the Design and Control of Free-Piston Linear Generator

et al. 2018

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The Free-piston linear generator (FPLG) is a novel energy converter which can generate electrical energy and is regarded as a potential technology for solving the restriction of the short driving range of electric vehicles. Getting rid of the crank and flywheel mechanism, FPLG obtains some advantages of a variable compression ratio, compact size, and highly-efficient power generation. Linear electric machine (LEM) design and piston motion control are two key technologies of FPLG. However, they are currently the main obstacles to the favorable performance of FPLG. LEM being used to drive the piston motion or generate electric energy is an integrated design including a motor/generator. Various types of LEMs are investigated, and suitable application scenarios based on advantages and disadvantages are discussed. The FPLG's controller is used to ensure stable operation and highly-efficient output. However, cycle-to-cycle variations of the combustion process and motor/generator switching make it difficult to improve the performance of the piston motion control. Comments on the advantages and disadvantages of different piston motion control methods are also given in this paper.The piston moves freely between TDC and bottom dead center (BDC), and its motion is determined by the resultant force that is acting upon it, including gas pressure force, electro-magnetic force, and rebound force [8][9][10]. The piston motion must be controlled by an electronic control system-an electronic crankshaft, which is an integrated control of combustion parameters or control variables of the LEM and rebound devices [5]. Moreover, there are cycle-to-cycle variations and periodic large disturbances during the combustion process. As a result, piston motion control is still the biggest challenge of FPLG [11]. Besides, LEM is not only used as a power output unit but also a control unit for adjusting the movement of the piston. For the FPLG, LEM requires high reliability, high precision, high efficiency, and so on. Various structures of LEM designed by many teams around the world have been investigated, but none of these meet all of the requirements due to the short stroke, high frequency, and high acceleration.In order to lucubrate the current existing problems, this paper reviews the key technologies of LEM design and FPLG motion control. Firstly, several basic structures of FPLG are introduced, and both their advantages and disadvantages are analyzed. Afterwards, according to the different types of structure, corresponding advantages and disadvantages of LEMs are presented. With respect to the existing LEMs, they are classified according to the different flux path and topology structures in the third section. Finally, different starting methods are introduced based on the FPLG's structure. In terms of power generation stage, piston motion control strategies are divided into three forms and introduced based on their control variables. They include three categories: active combustion parameters control, active LEM control, and the mixed cont...

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Section: Different Flux Type Permanent Magnet Lemsmentioning

confidence: 99%

A Review of the Design and Control of Free-Piston Linear Generator

et al. 2018

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“…The arrangement of PMs are shown in Figure 3, where v refers to the motion direction. On the basis of the optimization with the targets of minimizing the flux leakage and maximizing the force density [14][15][16], an optimum design for the TFPMLM is obtained, and the basic parameters are listed in Table 1. …”

Section: Structure Of the Transverse-flux Permanent-magnet Linear Macmentioning

confidence: 99%

“…In [15], optimizations of the leakage factor for two staggered-teeth topologies and the performance comparison between them are carried out; in addition, the methods to improve force density and power factor for the staggered-teeth TFPMLM are researched. In [16], a comprehensive analysis of flux leakage, no-load and load characteristics with different axial thicknesses of stator core is made; furthermore, a cut-tip stator tooth is adopted to cripple the thrust ripple and increase the power factor. Compared with the TFPMLM employing soft magnetic composite (SMC) to achieve the complex structure and three-dimensional (3-D) flux path, the stator core of staggered-teeth TFPMLM is laminated by electrical-steel sheets, which results in a relatively simple manufacturing process and high reliability [17,18].…”

Section: Introductionmentioning

confidence: 99%

“…A novel staggered-teeth TFPMLM is proposed in order to solve the problems of high flux leakage and low power factor existing in the conventional TFPMLM [14][15][16]. For the staggered-teeth TFPMLM, the three phases can be arranged in axial direction or circumferential direction, and cylindrical topologies are particularly competitive for free-piston energy converter applications.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Analysis of a Novel Cylindrical Transverse-Flux Permanent-Magnet Linear Machine

Zhang

Jin

et al. 2015

Energies

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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.

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Flux leakage analysis of transverse-flux PM linear machine

Cited by 2 publications

References 7 publications

A Review of the Design and Control of Free-Piston Linear Generator

A Review of the Design and Control of Free-Piston Linear Generator

Thermal Analysis of a Novel Cylindrical Transverse-Flux Permanent-Magnet Linear Machine

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