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The aim of the reduction method is to integrate the reduced model in a multi-physical electric machine optimization procedure and use the obtained model in real-time monitoring of machine critical parts. In this paper, an electric machine thermal model reduction method is proposed. Using the lumped parameter thermal network (LPTN) method, a thermal model is developed in order to represent the thermal...
This paper presents a step-by-step procedure to study the impact of each thermal phenomenon occurring in electric machines on their internal temperature distribution. First, the Monte-Carlo method is chosen as a global sensitivity analysis technique. This method is applied on a thermal network of a prototype consisting of a permanent magnet based integrated starter-generator machine (ISG). Accordingly,...
Embedded automotive application has one of the harshest environment for electrical machine, especially in terms of thermal requirement. In this study, thermal evaluation of a small synchronous reluctance (Syncrel) machine intended to be used as clutch actuator is presented. A lumped parameter (LP) thermal model was built and validated experimentally. The results of the model subjected to a standardized...
Design and performance of mechatronic systems depends on many factors and subsystems like gears, hydraulic components and electric motors. These latter are considered as a principle device in electromechanical power conversion, thus their design becomes of a prime importance. This paper aims to build electric motor models along with its control strategy and power electronics component in order to...
This paper presents a new methodology for identifying, by means of inverse methods, the convective heat exchange coefficients between an electric machine and ambient air. The inverse method that we use involves minimizing the residual between the machine's internal losses and the total amount of heat extracted to ambient air in a thermal steady-state condition. First, we start by establishing the...
Machine slot thermal behavior is one of the most complex issues in electrical machine thermal modeling. It may however take advantages of various studies on composite winding homogenization to make the slot modeling less complex. In order to reduce computation time of winding, many has developed and adopted winding homogenization method. The composite windings are assimilated to a single homogenous...
In high speed application requiring field weakening operation, iron losses could be really significant and have several origins: the frequency linked to the speed and the flux density waveform in the iron. In field weakening operation, the fundamental of flux densities waveforms decreases and could have a mitigating effect on the iron losses. However the harmonic content increases too and could have...
With the ever increasing pressures in automotive industries to develop smaller and more efficient electrical motors for their applications, it becomes necessary to have a thermal model at the design stage. This study proposes a fast, precise and practical thermal model construction that requires minimal development time for a synchronous reluctance machine which is to be used in automotive applications...
Heating of machines is a key characterisitic of their behaviour. Heat sources come mainly from energy losses during electromechanical conversions (electrical in copper, magnetic in iron, aerolic and mechanical in bearings). Temperatures changes can be described thanks to thermal conduction, convection and radiation equations. Thus it is necessary to build a thermal model adapted to the simulation...
The optimal design of electrical machines is an important issue in a context of industrial competitiveness particularly in the automotive, in order to minimize the use of scarce material and to save energy. In addition, a "really" optimal design needs to dispose sufficiently accurate and fast models of the main physical phenomena involved in an electromechanical conversion. This work deals...
Automotive alternator efficiency has become of a prime importance for the reduction of car's consumption. The paper shows the experimental repartition of various losses. It is shown that, especially for high speed operation, the iron losses become an important part of the total losses. These iron losses are very difficult to determine because classic models are not adapted. Concerning the stator losses,...
Most methods for state-of-charge or state-of-health prognostics are impedance based. Impedance models must be as simple as possible to be implemented on embedded applications but as accurate as possible to represent the main electrochemical phenomena. The parameters of such models can be identified using impedance spectroscopy. However, the electrochemical features change in relation to numerous parameters,...
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