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Дисертації з теми "Circuit équivalent magnétique"
Benmessaoud, Youcef. "Circuit équivalent magnétique non-linéaire adaptatif : 2-D et 3-D avec prise en compte des courants induits." Thesis, Bourgogne Franche-Comté, 2020. http://www.theses.fr/2020UBFCD064.
Повний текст джерелаIn the face of climate change, the automotive industry has aroused particular interest in reducing CO2 emissions.The electrification of vehicles seems to be an essential solution to meet European standards and standardizations. New technological challenges are imposed and spread across the entire electric drive chain, from the battery to the electric motor. In this context, Agence de l’Environnement et la Maitrise de l’Energie is setting a colossal budget to encourage energy transition. In this context, the Conception Optimal des Chaines de traction Electrique project was handled, and whose main coordinator is RENAULT. The thesis fits into the first axis of the project, which aims to model the electric motor component.The main objective of the thesis is two-dimensional and three-dimensional semi-analytical modeling taking into account to eddy-current while the electromagnetic analysis of the electric machine. 2-D and 3-D models based on the method of magnetic equivalent circuits have been developed. Subsequently coupled to ananalytical model allowing the estimation of eddy-current losses within the massive conductive parts. This model would be of assistance during thermal analyzes of static or dynamic electromagnetic devices
Blache, François. "Modélisation électronique et électromagnétique d'un transformateur haute fréquence à circuit magnétique en fonte." Phd thesis, Grenoble INPG, 1995. http://tel.archives-ouvertes.fr/tel-00599667.
Повний текст джерелаGazdac, Ana Maria. "Design and control of the dual rotor permanent magnet induction machine for electric traction." Amiens, 2013. http://www.theses.fr/2013AMIE0109.
Повний текст джерелаThe present thesis proposes a new concept of electrical machine, the dual-rotor Permanent Magnet Induction Machine, as an alternative to existing electrical machines for electric traction applications. The concept of dual-rotor Permanent Magnet Induction Machine (PMIM), its operating principle, advantages and disadvantages compared to classical machines as well as design and sizing methodologies are studied. Two analytical pre-sizing methods are thus proposed in this thesis: Stator Geometry Based Method (SGBM) where the sizing algorithm begins from a given stator geometry and Output Power Based Method (OPBM) where the sizing algorithm starts from an imposed output power. The analytical approach is complemented by a study using the Finite Element Method for comparing the PMIM with the IM (Induction Machine) and the PMSM (Permanent Magnet Synchronous Machine) based on their performance, electromagnetic torque, losses and output power. Analysis of the influence of different types of magnetic and conductive materials on the performance of the PMIM is also performed, as well as an investigation on its thermal behavior. The last part of the thesis focuses on the control of the PMIM which required a prior identification of parameters of the equivalent electric circuit. The control strategy, which is based on the Field Oriented Control and is composed of two loops, one asynchronous loop for the cage rotor and one synchronous loop for the PM rotor, is then proposed to validate the dynamic behavior of the PMIM. The validation is done by comparing the results obtained by co-simulation (FEM and External control) and Park model. All obtained results allow building a prototype of the PMIM
Cogitore, Bruno. "Recherche de circuits équivalents pour les composants magnétiques haute fréquence." Grenoble INPG, 1994. http://www.theses.fr/1994INPG0059.
Повний текст джерелаBernot, Alix. "Modélisation et optimisation d'une machine électrique homopolaire en poudre de fer." Thesis, CentraleSupélec, 2015. http://www.theses.fr/2015SUPL0025/document.
Повний текст джерелаThis thesis presents the study of a claw-pole transverse flux electric machine. At first, SMC material properties and transverse flux structures are studied, leading to the choice of a structure combining a claw-pole stator and a permanent magnet rotor. The machine is modelled by the means of a magnetic equivalent circuit, with a reluctance network, developed with the help of finite elements simulation. The model is then changed with the introduction of the hypothesis that the flux is bent inside the airgap; it is then validated by the test of a prototype.The architecture of the machine is optimized after a detailed analysis of the flux circulation, leading to the identification of the tooth-tip saturation issue. After finite element simulation of the improved machine, a prototype is later tested, which confirms the gain brought by the new architecture.An alternative version of the machine, with a field winding attached to the stator and a massive rotor is then proposed. This machine promises to be cost-effective to build and robust thanks to its massive rotor. An analytical model of the machine is introduced, along with a finite element simulation, to end with the test of a prototype which confirms the possibilities of this new concept. An improved version of the machine with a rotor with isolated teeth is finally studied, with an analytical model and a finite element leading to the validation of the interest of this evolution
Yang, May tia. "Etude des performances en bruit de capteurs magneto(élasto)électriques en mode non-linéaire." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMC266/document.
Повний текст джерелаThe MagnetoElectric effect traduces the polarization of a dielectric element and the magnetization of a dielectric under respectively a magnetic field and an electric field. This property allows the development of Magneto(Elasto)Electric sensors for measuring a magnetic or an electric field. Several analyses regarding the material coupling (shape, size, dimensions…) have been made in order to increase the performances in terms of sensibility and in terms of noise of these sensors. The best noise levels (in term of spectral density) measured for these types of sensors are respectively 5 pT/sqrt(Hz), 0.2 pT/sqrt(Hz) and around 50 fT/sqrt(Hz) at 1 Hz, at white noise zone and at resonant frequency.Some laboratories, including the GREYC, are interested more specifically on the studies of the ultimate performances of magnetic sensor by optimizing the conditioning electronics and by using their nonlinear properties. This thesis lies in this framework. It had for objective, to study the performances of the Magneto(Elasto)Electric sensor in nonlinear mode and at low frequencies. For these, some original conditioning structures have been developed in terms of polarization, excitation and servo system. The theoretical study of these performances show the sensor intrinsic noise can reach lower than pT/sqrt(Hz) at 1 Hz for the studied sensor if the obtained performances are not limited by the conditioning electronics and their sensitivity. This study has been the object of this thesis work
Zhuang, Xin. "Etude et mise en œuvre de capteurs magnétiques à très haute sensibilité à base d’hétérostructures magnéto(élasto)électriques." Caen, 2013. http://www.theses.fr/2013CAEN2007.
Повний текст джерелаThe purpose of this dissertation was to study and to optimize magnetic sensors based on magnetoelectric (ME) composites and associated detection units for noise reduction. It is to take those first critical steps of understanding the origins of different noise sources and their interactions with the detection system. The analysis has been made especially by measuring the equivalent magnetic noise spectral density. Next step, the study on the ME sensor with constitutive equations, contribution of various noise sources and the amplification system allows establishing a complete electro-mechanical model of sensors under research. Various numerical simulations drawn from this model allow estimating the observed phenomena, improving sensor performances and adapting to the electronic implementation for best. Therefore, this work allows optimizing the achieved device by considering the geometry and the properties of magnetostrictive and piezoelectric materials implemented in ME sensors. The lowest noise performance is 5 pT/√Hz at 1 Hz for achieved ME sensors
Cuellar, Quispe Carlos Enrique. "HF characterization and modeling of magnetic materials for the passive components used in EMI filters." Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10061/document.
Повний текст джерелаThe switching semiconductor devices in static-converters are the main source of electromagnetic interference (EMI). Reduction of these emissions can be achieved by different techniques including the use of EMI filters which design requires the use of magnetic cores. These must have adequate physical properties allowing the EMI filter to fulfill its task within a specified frequency range whatever the operating conditions (saturation, temperature…). Therefore, in the present work, some methodologies and models are developed in order to be able to design the EMI filter within its real conditions of operation. First, the magnetic core is considered in small-signal conditions and a method is proposed to measure the complex magnetic permeability in high frequency (HF). Two models, analytical and lumped-circuit network, are developed to account for the HF characteristics. In a second step, the material is considered saturable as the EMI filter can be subjected to more important currents, leading to the modification of its main characteristics. Then, a non-linear modeling approach, with and without hysteresis effect, including a material capacitance is considered for modeling the magnetic core. Additionally, a technique is proposed to characterize in HF the magnetic hysteresis loop from a single turn flat coil configuration.Finally, an improved current injection method, with new designed current probes, is used to characterize the input impedance of a converter. The impedance, combined with the developed small-signal and high-signal material models, is used to predict the insertion loss of an EMI filter. Simulation results are validated by the experiment
Benlamine, Raouf. "Etude et réalisation d'une machine électrique à forte densité de couple et fort rapport de sur-couple pour des applications de traction automobile." Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2014/document.
Повний текст джерелаThe societal and environmental context in France and Europe during the last few years has been largely favorable to the electrification of transportation means, mainly vehicles, in order to reduce CO2 emissions. The authorities are working hard to make the electrified vehicles more affordable, by providing substantial premiums during the purchase of “clean” vehicles. For their part, the automakers are looking to reduce the cost of electric and hybrid electric vehicles by offering technical solutions that can reduce the manufacturing cost of the car components, mainly batteries, thermal and electric motors, while ensuring high performances. The main objective of this thesis is to study and realize an electric machine, which satisfies very restrictive specifications in terms of axial size and torque density in order to be used as a traction motor for a hybrid electric vehicle. In addition, this machine must be innovative, with a high reliability, low cost and automated manufacturing process. Thus, a state of art about the various electric machines has been achieved. Depending on the requirements of our application, an axial flux machine with buried permanent magnets and concentrated winding has been selected. Initially, a simplified analytical model has been developed and coupled to an optimization tool. The obtained geometrical and electrical parameters have been adjusted using a numerical model based on the 3D finite element. Various modifications have been applied to the initial machine due to the modification of the geometrical and performance specifications. Electromagnetic performances such as torque and power have been analyzed for various operating points. Losses in the permanent magnets have been calculated using a hybrid numerical 3D model based on the finite difference and finite element, which allows to reduce the computation time compared to transient 3D finite element. In order to validate the different results, a prototype of the machine has been realized. This machine has also been modeled using a quasi-3D magnetic equivalent circuits. This semi-analytical model is generic regarding the geometrical and electrical parameters, with an adaptive discretization. Furthermore, the saturation and the slotting effects have been taken into account. The magnetic flux density, the flux linkage and the electromagnetic torque have been calculated with this model, ensuring high accuracy and reduced time computation compared to 3D finite element
Leseigneur, Christelle. "Développement d'un modèle d'immunité rayonnée pour la caractérisation de dispositifs électroniques." Rouen, 2010. http://www.theses.fr/2010ROUES030.
Повний текст джерелаEMC requirements are becoming stricter and must be taken into account during the design phase of electronic devices. For that reason, it is necessary to have models representing electromagnetic behavior of printed circuit boards and components. This thesis, performed at IRSEEM, aims to develop radiated immunity models of electronic circuits. These models should allow a preliminary design of near-field coupling between a non-uniform electromagnetic wave and an electronic circuit. The purpose is to obtain a resolution faster than the one available in electromagnetic commercial software currently on the market. To do so, a first analyze of the coupling between non-uniform waves generated by an electric or a magnetic probe with a transmission line was realized. An analytical calculation of the field radiated by the probes is proposed. Then, using the Image Theory and an approximation of the Taylor model we are able to predict the induced voltage in the line due to radiated fields. Then we suggest two methods for analyzing the coupling between an electronic system (source of disturbance) and a transmission line (victim). In both cases the induced voltage in the line is calculated using the transmission lines theory and the Taylor or Agrawal model. The exciting field can be calculated by : - a set of elementary sources (electric and magnetic dipoles), modeling the source, and the Images' Theory - a decomposition of the radiated field into a sum of plane waves using the plane-wave spectrum and the reflection properties of plane waves. In both cases we have validated our approach by simulations and measurements using passive or active circuits. Both methods give good results and allow to estimate induced perturbation