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Créteil, France

Harmand S.,University of Lille Nord de France | Harmand S.,University of Valenciennes and HainautCambresis | Sonan R.,University of Lille Nord de France | Sonan R.,University of Valenciennes and HainautCambresis | And 4 more authors.
Applied Thermal Engineering | Year: 2011

This paper presents a theoretical investigation of a Flat Heat Pipe (spreader) designed for the cooling of multiple electronic components in transient state. This model is a transient model, coupling 3D thermal model with a 2D hydrodynamic one through the mass flux of evaporation-condensation, which occurs in a mass conservation equation. The model makes it possible to obtain the FHP wall transient temperatures, the transient pressures, velocities and temperatures in both liquid and vapor phases. A comparison of the behaviour of the FHP and an equivalent solid plate submitted to a transient thermal cycle shows that the FHP enhanced the electronic components cooling for the long thermal cycle duration when the solid plate is more efficient for the very short transient thermal cycles. The FHP provides also a very low thermal resistance, which helps to minimise the temperature gradient and then the hot spots and overheating. © 2011 Elsevier Ltd. All rights reserved.

Caron G.,Lille University of Science and Technology | Henneron T.,Lille University of Science and Technology | Piriou F.,Lille University of Science and Technology | Mipo J.-C.,Valeo Electrical Systems
IEEE Transactions on Magnetics | Year: 2016

In numerical computation, the finite-element method associated with external electric circuits is often used to evaluate electromagnetic devices with voltage sources. To study the solution of the steady state, the computation time can be prohibitive due to a large transient state compared with the time step used to discretize the time domain. In this paper, a method based on the waveform relaxation method is developed in order to impose the steady state of the solution in the case of a nonlinear magnetostatic problem coupled with electric circuit equations. © 1965-2012 IEEE.

Wang Z.,University of Michigan | Henneron T.,University Lille1 | Piriou F.,University Lille1 | Mipo J.-C.,Valeo Electrical Systems
IEEE Transactions on Magnetics | Year: 2015

Galerkin projection, which transfers field distribution between different meshes, has proven its utility for various applications of finite element analysis. In this framework, the authors propose a field projection method that considers nonlinear magnetic properties. The formulations given are based on the energy conservation between different meshes. © 2015 IEEE.

Jandaud P.-O.,University of Lille Nord de France | Harmand S.,University of Lille Nord de France | Fakes M.,Valeo Electrical Systems
Journal of Physics: Conference Series | Year: 2012

In this paper, flow inside an electric machine called starter-alternator is studied parametrically with CFD in order to be used by a thermal lumped model coupled to an optimization algorithm using Particle Swarm Optimization (PSO). In a first case, the geometrical parameters are symmetric allowing us to model only one side of the machine. The optimized thermal results are not conclusive. In a second case, all the parameters are independent. In this case, the flow is strongly influenced by the dissymmetry. Optimization results are this time a clear improvement compared to the original machine. © Published under licence by IOP Publishing Ltd.

Li L.,CNRS Grenoble Electrical Engineering Lab | Kedous-Lebouc A.,CNRS Grenoble Electrical Engineering Lab | Foggia A.,CNRS Grenoble Electrical Engineering Lab | Mipo J.-C.,Valeo Electrical Systems
IEEE Transactions on Magnetics | Year: 2010

This paper presents a study on magnetic materials for claw pole machines which are widely used nowadays in the automobile industry for their simple manufacturing and cost reasons. The finite element analysis with the loss surface model is used to evaluate the iron losses for three categories of material: M800-50A, M330-35A, and AFK502. Comparisons are made in terms of output current, efficiency, as well as iron loss as main characteristics of the machine. On the other hand, the experimental method of loss separation provides a clear idea of the loss distribution in the machines, from which the iron loss can be deduced. A qualitative comparison is made between the two methods, which proves to be coherent. © 2010 IEEE.

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