Temperature rises characteristics of modern double sided flat permanent magnet linear generator for free piston engines for hybrid vehicles (original) (raw)

2024, IJRAME PUBLICATIONS

This paper presents the development of a thermal model for a novel flat, double-sided linear generator designed for use in free-piston engines. The study conducted in this paper examines the influence of temperature on the performance of the permeant magnet linear generator, an integral and pivotal component within the system. This research places particular emphasis on the Neodymium Iron Boron (NdFeB) permanent magnet, which serves as a source of magnetic field for the linear generator. In this study, an internal combustion engine that tends to produce heat is connected to a generator. Considering the temperatures rise from both the combustion process and the thermal contributions of current-carrying conductors and frictional forces. Utilizing Computational Fluid Dynamics (CFD) method, a thermal model of the (NdFeB) magnet within the linear generator is constructed and analyzed. Furthermore, the temperature field is examined to ensure that the linear generator operates under stable conditions without the risk of demagnetization.

Linear Permanent Magnet Electric Generator for Free Piston Engine Applications

As a response to the major climatic changes due to global warming and the foreseen oil shortages once the natural reserves will perish, most vehicle manufacturers began research programs on alternative fuel vehicles. The Hybrid Electric Vehicles, as an intermediate step to full electric vehicles, can incorporate Free Piston Engine – Linear Electric Generator systems to produce the required electric energy. A novel six-side, 3 phase, linear generator with permanent magnets on the translator is proposed. For designing the generator a different approach is used: geometric dimensions and electric parameters are determined based on an Equivalent Magnetic Circuit implemented in National Instruments' LabVIEW. Based on these values a three dimensional finite elements analysis model of the linear generator is created to validate the method. Index Terms—permanent magnet machines, linear electric generators, free piston engine

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A Review on Design and Development of Free Piston Linear Generators in Hybrid Vehicles

IOP Conference Series: Materials Science and Engineering, 2019

The rapid exploitation of fossil fuels due to their indiscriminate use has brought us to a situation when we cannot sustain the use of fuels like petrol and diesel for more than 30 years from now. Governments and energy companies around the world are looking for some alternative source of energy to power the vehicles. A lot of research is being carried out in this field and many researchers have concluded that hybrid vehicles can be a boon to eradicating the dependence on conventional fuels and move towards battery-aided power trains for running the vehicles. Today, there are a few electric vehicles on roads but in the near future the roads are going to be flooded by them. To propel them, we need batteries which should be charged at some intervals. In absence of battery charging stations, we would need range extending devices on the vehicles itself. A Free Piston Linear Generator (FPLG) is an electric generator which produces electricity by virtue of oscillation of a free piston in ...

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A coupled model of the Linear Joule Engine integrated with a tubular permanent magnet linear alternator

2016

Linear Joule Engine uses double acting free piston mechanism in its split compression and expansion cylinders, which decreases friction losses in comparison of crankshaft engines, and increases compression and expansion efficiencies in comparison of rotary heat engines. The penalty of the setup, especially split cylinders, is the increased volume of the engine. To keep a couple kilowatt engine generator in a compact size, it is proposed to integrate a permanent magnet linear alternator fully into the compressor of the Linear Joule Engine. The double acting piston in the compressor has embedded permanent magnet and works as the translator, while the compressor cylinder bore is mounted with coils as the stator. In the paper, a coupled dynamic model of the Linear Joule Engine and the integrated linear alternator is firstly presented. The coupled model bridges mechanical and electrical parts of the novel engine generator, and provides dynamic performance prediction of the design. © 2016...

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Design of a permanent magnet linear generator

1st International Forum On Strategic Technology "e-Vehicle Technology", IFOST 2006, 2006

This paper present our experience in the design of a permanent magnet generator. The generator has a long translator and a permanent magnet mover as magnetic field source. It generates a three phase electrical current. The generator is proposed to be operated using a dual chamber free piston internal combustion linear engine. The finished product is to be placed in a hybrid electric vehicle to generate electricity to run the motors and to charge the batteries [1],[2]. The machine design is performed using a 2D finite element analysis. The generator produces a three phase voltage and the power output is 7 kW. This paper also presents the fabrication of the prototype. © 2006 IEEE. http://ieeexplore.ieee.org/ielx5/4107286/4107287/04107367.pdf?tp=&arnumber=4107367&isnumber=4107287

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Transient Thermal Modeling Of An Axial Flux Permanent Magnet (Afpm) Machine Using A Hybrid Thermal Model

2010

This paper presents the development of a hybrid thermal model for the EVO Electric AFM 140 Axial Flux Permanent Magnet (AFPM) machine as used in hybrid and electric vehicles. The adopted approach is based on a hybrid lumped parameter and finite difference method. The proposed method divides each motor component into regular elements which are connected together in a thermal resistance network representing all the physical connections in all three dimensions. The element shape and size are chosen according to the component geometry to ensure consistency. The fluid domain is lumped into one region with averaged heat transfer parameters connecting it to the solid domain. Some model parameters are obtained from Computation Fluid Dynamic (CFD) simulation and empirical data. The hybrid thermal model is described by a set of coupled linear first order differential equations which is discretised and solved iteratively to obtain the temperature profile. The computation involved is low and th...

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