Research on the Magnetic Characteristic of a Novel Transverse-Flux PM Linear Machine Used for Free-Piston Energy Converter

Zheng, Ping; Tong, Chengde; Chen, Gang; Liu, Ranran; Sui, Yi; Shi, Weichao; Cheng, Shijie

doi:10.1109/tmag.2010.2096534

Cited by 31 publications

(13 citation statements)

References 8 publications

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“…And numerical optimization results of 3D FEA concluded that the FSPMLEMs were uncompetitive compared to the TFPMLEMs due to the large flux leakage even with improved tooth structure. However, complex structure and low power factor for TFPMLEMs remain to be solved [23,31,34]. Compared to SMPMLEMs, both of them suffered from a large moving mass which would result in low motion frequency and low dynamic response.…”

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 simulation results of all three efficiency curves were applied to estimate the controller coefficient in (4). Each reference operating point of the SMPC was differed by each REX efficiency curves.…”

Section: Vehicle Simulation With Power Management Controlmentioning

confidence: 99%

“…Unlike conventional engines that the piston motion is deter mined by the crank system, the piston motion of free piston engine is determined by the instantaneous force balance on the mover, which the piston motion may vary for different operat ing conditions. Numerous linear generators for integration in the free piston engine have been analyzed [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Design considerations of a linear generator for a range extender application

Seo

Riemer

Appunn

et al. 2015

Archives of Electrical Engineering

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Abstract:The free piston linear generator is a new range extender concept for the application in a full electric vehicle. The free piston engine driven linear generators can achieve high efficiency at part and full load which is suitable for the range extender application. This paper presents requirements for designing a linear generator deduced from a basic analysis of a free piston linear generator.

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“…In the past decade, transverse-flux permanent-magnet linear machine (TFPMLM) has been widely employed in the applications of electrical power generation [1][2][3][4][5], magnetic levitation [6,7], electromagnetic launcher [8,9], etc. [10].…”

Section: Introductionmentioning

confidence: 99%

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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Research on the Magnetic Characteristic of a Novel Transverse-Flux PM Linear Machine Used for Free-Piston Energy Converter

Cited by 31 publications

References 8 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

Design considerations of a linear generator for a range extender application

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

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