A Tubular PM Linear Generator With a Coreless Moving-Coil for Free-Piston Engines

Free-piston engine coupled with linear generator is a new kind of thermoelectric energy converter. It has been highly concerned due to its high efficiency and low emission in recent years. In this paper, a tubular moving-coil linear generator is developed for the application of free-piston engines. The two-dimensional finite-element model of the linear generator is established, and its electromagnetic characteristics are analyzed. A power converter is designed to control the operating state and the electric current of the linear generator. A prototype is developed and used in a free-piston engine with a bore of 102 mm, and the main performance parameters are tested. According to the simulated and tested results, the linear generator can realize the stable running of free-piston engines. The peak power of the linear generator in a cycle is about 16.77 kW, and the averaged generating power of a cycle is 3.37 kW at the working frequency of 10 Hz. The generating efficiency at peak power of a cycle is about 95.2%, the averaged generating efficiency of a cycle is about 87.5%.

[1]  S. Jang,et al.  Armature reaction effect and inductance of moving coil linear oscillatory actuator with unbalanced magnetic circuit , 2001 .

[2]  Jiabin Wang,et al.  A Linear Permanent Magnet Generator for a Free-Piston Energy Converter , 2005, IEEE International Conference on Electric Machines and Drives, 2005..

[3]  P. Zheng,et al.  Research on a Tubular Longitudinal Flux PM Linear Generator Used for Free-Piston Energy Converter , 2007, IEEE Transactions on Magnetics.

[4]  Siqin Chang,et al.  Improved Moving Coil Electric Machine for Internal Combustion Linear Generator , 2010, IEEE Transactions on Energy Conversion.

[5]  Siqin Chang,et al.  Prototype testing and analysis of a novel internal combustion linear generator integrated power system , 2010 .

[6]  Yang Wang,et al.  Numerical analysis of two-stroke free piston engine operating on HCCI combustion , 2011 .

[7]  Wei Hua,et al.  Design and Analysis of Linear Stator Permanent Magnet Vernier Machines , 2011, IEEE Transactions on Magnetics.

[8]  Liang Yan,et al.  Armature Reaction Field and Inductance of Coreless Moving-Coil Tubular Linear Machine , 2014, IEEE Transactions on Industrial Electronics.

[9]  R. Mikalsen,et al.  Recent commercial free-piston engine developments for automotive applications , 2015 .

[10]  Guohong Tian,et al.  Development and validation of a free-piston engine generator numerical model , 2015 .

[11]  Hidemasa Kosaka,et al.  Development of Free Piston Engine Linear Generator System Part3 -Novel Control Method of Linear Generator for to Improve Efficiency and Stability , 2016 .

[12]  Hui-hua Feng,et al.  An experimental research on the combustion and heat release characteristics of a free-piston diesel engine generator , 2017 .

[13]  Tony Roskilly,et al.  Research on the operation characteristics of a free-piston linear generator: Numerical model and experimental results , 2017 .

[14]  Zongxuan Sun,et al.  Trajectory-based combustion control for renewable fuels in free piston engines , 2017 .

[15]  Minqiang Hu,et al.  Research on a Direct-Drive Wave Energy Converter Using an Outer-PM Linear Tubular Generator , 2017, IEEE Transactions on Magnetics.

[16]  Mike Barnes,et al.  Fast Operating Moving Coil Actuator for a Vacuum Interrupter , 2017, IEEE Transactions on Energy Conversion.

[17]  Tao Xia,et al.  Design and Analysis of a Field-Modulated Tubular Linear Permanent Magnet Generator for Direct-Drive Wave Energy Conversion , 2017, IEEE Transactions on Magnetics.

[18]  Torben Ole Andersen,et al.  Modeling and Validation of Moving Coil Actuated Valve for Digital Displacement Machines , 2018, IEEE Transactions on Industrial Electronics.

[19]  R. Nie,et al.  Three-Dimensional Electromagnetic Analysis of Tubular Permanent Magnet Linear Launcher , 2018, IEEE Transactions on Applied Superconductivity.