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The leakage reactance of large turbogenerators is an important electrical parameter. Standard IEC 60034-4 gives measurements on the stator only which can be translated straightforwardly in computational electromagnetics. Several previous studies on this subject can be found in literature. In our opinion, they do not take into account accurately enough the actual leakage flux. Indeed a part of the...
Thermal design and management of electric machines is important for achieving higher specific power outputs and, the heat transfer in the air gaps within them require further study. Research into convective heat transfer in the gaps between the rotor and the stator has generally centered on the rotor due to interest from turbomachinery applications. This paper focuses on rotating electric machines...
Knowledge of the internal temperatures of an electric machine under real-time operating conditions would be extremely useful in order to determine its torque capabilities. This knowledge is also useful for full-scale electric or hybrid electric vehicle (EV/HEV) simulation and optimization. In this paper, we present a technique for developing computationally-efficient thermal models for electric machines...
Knowledge of the internal temperatures of an electric machine under real-time operating conditions would be extremely useful in order to determine its torque capabilities. This knowledge is also useful for full-scale electric vehicle simulation and optimization. In this paper we present a technique for developing computationally-efficient thermal models for electric machines that can be used for real-time...
It is a known fact, that three-dimensional FE-Simulations are very slow, which prevents their usability in larger system models. In this paper, a Matlab/Simulink model for a TFM is developed to enable fast simulations of complete drive systems with power converters and other components. The model is derived by incorporating precomputed FEM data into a Matlab function, thereby allowing a 4.2 million...
A general method to model rotary machines using finite-element method (FEM) of transient magnetic field computation is presented. The merits of the proposed methods are that the nonlinear iteration on the rotor position is avoided; a curvilinear element is used in the two sides of the sliding surface; the methods being proposed to deal with matching boundaries and periodic boundaries are very general,...
A new approach for simulating electric machines by combining the finite element method with an analytical model of the air gap is presented. Although the initial setup of the model makes the approach more computationally intensive than traditional finite element analysis (FEA) for the simulation of a single rotor position, the simulation of subsequent rotor positions is dramatically faster than traditional...
The physics-based phase variable model has been developed for several types of machines and transformers. The parameters (inductance/flux linkage) of the physics-based phase variable model were determined using the solutions of field computation to actually reproduce their variations during the machine operation. The developed physics-based phase variable model has the advantage over the conventional...
Traditional modeling tools such as MATLAB/simulink for the dynamic characteristic simulation of electrical machine has been constrained to cumbersome and complex calculation to obtain the causal relation between input and output of the block. This paper introduces a new modeling and simulation platform-Mworks based on the Modelica language, which enables convenient and efficient modeling and simulation...
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