3D analyses of a novel Transverse Flux machine for a free piston energy converter

Cosic, Alija; Sadarangani, Chandur; Leksell, Mats

doi:10.1109/icelmach.2008.4799878

Cited by 6 publications

(6 citation statements)

References 2 publications

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“…The segregated stator core pieces generate flux leakage and fringing between these pieces, which are absent in traditional machines. In [51], values of about 50% magnet leakage flux and about 70% armature flux leakage have been reported. The other reason is the low generation of induced voltage due to improper utilization of PMs in the TFPM machine which causes leakage between adjacent poles.…”

Section: F Power Factormentioning

confidence: 99%

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A Review on Transverse Flux Permanent Magnet Machines for Wind Power Applications

et al. 2020

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Transverse flux permanent magnet (TFPM) machines are a potential candidate for directdrive wind power application due to high torque and power densities. The operating principle of TFPM machines is firstly described with various topologies available in literature, with the placement of magnets as a criterion for the classification of TFPM machine topologies. This review includes characteristics, power factor improvement, cogging torque minimization, material consideration, modelling techniques, and scalability. Different wind turbine concepts with direct-drive machines, control techniques and power converter topologies are also considered in this paper. INDEX Permanent magnet, topologies, transverse flux, and wind power.

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Section: F Power Factormentioning

confidence: 99%

“…In the 1970s, some articles on the linear TFPM machine for railway application by E. R. Laithwaite et al gave new life to this idea. Finally, a publication by H. Weh drew broad attention to this machine [51]. The force-producing magnetic circuit is positioned in a plane orthogonal to the direction of motion.…”

Section: Transverse Flux Pm Machinementioning

confidence: 99%

A Review on Transverse Flux Permanent Magnet Machines for Wind Power Applications

et al. 2020

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“…The more the winding is turned, the higher the induced voltage generated by the magnetic lines of force cut by the electromagnetic coil with the reciprocating motion of the piston. Based on the above parameters modeled in the 3D software [25,26], the isometric side view and half section view of the 3D model of the PMPMEE were obtained, as shown in Figure 1. When the PMPMEE is in regular operation, it uses the thermal energy generated in the combustion chamber to drive the reciprocating motion of the piston, which in turn directly drives the linear electric power structure to output electrical energy.…”

Section: Structure and Principle Of Pmpmeementioning

confidence: 99%

Design Optimization of Electrodynamic Structure of Permanent Magnet Piston Mechanical Electric Engine

2021

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To meet the demand of multiple power requirements, and enhance power utilization, a new type of dual-element electricity unit is designed in this study, which is a permanent magnet piston mechanical electric engine. Based on the analysis method of traditional internal combustion engines and linear generators, the working principle of the engine and the magnetic field distribution in the electrodynamic structure are analyzed, the machine dynamics model and electrodynamics model of the engine are established, then the theoretical evaluation is additionally established using finite elements. Based on this, an optimization model is constructed with the electrodynamic shape dimension as the optimization variable, with the intention of growing the output power. The optimization of the engine electrodynamic shape is executed via the use of the finite aspect approach and the NLPQL optimization algorithm integrated. The results show that the optimized engine output electricity expanded to 8.40 w, which is 18.81% greater than before optimization. An experimental prototype is developed, and the output voltage of the prototype is measured to verify the precept and overall performance of the new structure.

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“…LEM is an essential component which converts mechanical energy into electrical energy, and it also can be operated as a motor to start the engine and keep the compression ratio consistent through position control. During the design phase, both LEM performance and manufacturing technology should be taken into consideration [20,21]. Previous studies have pointed out that low moving mass is important to improve the operation frequency, and optimization of the LEM efficiency can significantly reduce the fuel consumption [22].…”

Section: Classification Of Fplg: Different 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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3D analyses of a novel Transverse Flux machine for a free piston energy converter

Cited by 6 publications

References 2 publications

A Review on Transverse Flux Permanent Magnet Machines for Wind Power Applications

A Review on Transverse Flux Permanent Magnet Machines for Wind Power Applications

Design Optimization of Electrodynamic Structure of Permanent Magnet Piston Mechanical Electric Engine

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

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