Investigation of a 7-pole/6-slot Halbach-magnetized permanent-magnet linear alternator used for free-piston stirling engines

2012 ◽  
Vol 111 (7) ◽  
pp. 07E711 ◽  
Author(s):  
Ping Zheng ◽  
Chengde Tong ◽  
Jing Zhao ◽  
Bin Yu ◽  
Lin Li ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Free Piston ◽  
Stirling Engines ◽  
Linear Alternator

A Comparative Study of Permanent Magnet Linear Alternator and Hydraulic Free-Piston Engines

2011 ◽  
Author(s):  
Ali Sadighi ◽  
Ke Li ◽  
Zongxuan Sun
Keyword(s):  
Comparative Study ◽  
Permanent Magnet ◽  
Fuel Efficiency ◽  
Hydraulic Pump ◽  
Combustion Chambers ◽  
Free Piston ◽  
Hcci Combustion ◽  
Free Piston Engine ◽  
Linear Alternator ◽  
Homogenous Charge Compression Ignition

This paper presents a comparative study of two possible power-generating units for the free-piston engine (FPE): Permanent-magnet linear alternator (PMLA) and linear hydraulic pump. The FPE discussed in this paper is a linear, opposed-piston, opposed-cylinder (OPOC) engine that operates with a homogenous charge compression ignition (HCCI) combustion. Lack of crankshaft in the FPE allows lower friction loss, variable compression ratio, and higher modularity compared to a conventional engine. Also the OPOC configuration enables high-frequency operation of the FPE, which results in high power density. The FPE is also well suited for HCCI operation, which offers improved fuel efficiency and emissions. The chemical power released in the combustion chambers can be transformed to fluid or electric power. This could be done via a hydraulic pump or a linear alternator. In this paper these two systems are studied and compared as the power-generating device for the FPE.

Modeling and Experimental Characterization of a Permanent Magnet Linear Alternator for Free-Piston Engine Applications

2009 ◽  
Author(s):  
Hans T. Aichlmayr ◽  
Peter Van Blarigan
Keyword(s):  
Mathematical Model ◽  
Permanent Magnet ◽  
Experimental Validation ◽  
Experimental Characterization ◽  
Piston Engine ◽  
Free Piston ◽  
Free Piston Engine ◽  
Linear Alternator ◽  
The Mathematical Model

Sandia National Laboratories is developing a prototype 30kW free-piston internal-combustion-based linear generator for vehicular applications. This paper describes the development and experimental validation of a mathematical model for the permanent magnet linear alternator that will be used by the prototype. A magnetic-flux versus mover-position function is used to correlate individual coil fluxes to the motion of the mover. This function is derived from a finite element electromagnetic simulation of the linear alternator. The mathematical model of the alternator is compared to experiments with prototype hardware driving 0.5–2kW loads; excellent correspondence to measured voltage and current waveforms is found.

scholarly journals Numerical Analysis and Parametric Study of a 7 kW Tubular Permanent Magnet Linear Alternator

2021 ◽  
Vol 13 (13) ◽  
pp. 7192
Author(s):  
Chin-Hsiang Cheng ◽  
Surender Dhanasekaran
Keyword(s):  
Permanent Magnet ◽  
Power Density ◽  
High Reliability ◽  
Fem Analysis ◽  
Electrical Energy ◽  
Load Test ◽  
Stroke Length ◽  
Free Piston ◽  
Linear Alternator ◽  
Material Choice

Free-Piston Stirling Engines (FPSEs) are known for their easy maintenance, longer lifetimes, high reliability, quiet operation due to no crankshafts, and having fewer seals compared to the traditional Stirling engine. Free-piston systems are popular in the conversion of thermal energy into electrical energy and are compatible with many types of heat sources. This research paper concentrates on the development of a Permanent Magnet Linear Alternator (PMLA) and parametrically analyzing it to predict its limitations and performance over variable operable conditions and material choices. Operable conditions including stroke length and frequency of the translator, and material choice for the stator and magnets, are varied in this study to analyze the machine and put it to test for its extreme limitations. Spacing between slots is introduced to reduce the overall mass of the stator and increase the power density. The load test is carried out with varied parameters. It induces a load EMF of 2.4 kV, yields a power of 7 kW, and has a power density of 314 W/kg by FEM analysis in peak variations. This study enumerates the performance variation of a PMLA over these varied conditions and illustrates the limitations of such power-dense machines.

Design and Experimental Analysis of a 3 kW Single-Phase Linear Permanent Magnet Generator for Stirling Engines

2018 ◽  
Vol 54 (11) ◽  
pp. 1-5 ◽  
Author(s):  
Kyu-Seok Lee ◽  
Sung-Ho Lee ◽  
Jung-Hyung Park ◽  
Jang-Young Choi ◽  
Kyu-Ho Sim
Keyword(s):  
Permanent Magnet ◽  
Experimental Analysis ◽  
Single Phase ◽  
Stirling Engines ◽  
Permanent Magnet Generator

scholarly journals Cogging force reduction in linear tubular flux switching permanent-magnet machines

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 243-248
Author(s):  
Doudou Sarr Lo ◽  
Yacine Amara ◽  
Georges Barakat ◽  
Ferhat Chabour
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Energy Conversion ◽  
Permanent Magnet ◽  
Permanent Magnet Machines ◽  
Free Piston ◽  
Force Reduction ◽  
Element Method

Abstract The aim of this paper is to explore the possibility of using linear tubular flux switching permanent magnet machines in a free piston energy conversion (FPEC) system. In FPEC systems, acceleration and therefore speed are often relatively high, which impose to have a reduced number of poles, meanwhile the cogging force will be relatively high. In order to reduce the cogging force two techniques are combined. The analysis is done using finite element method.

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