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The paper analyses the models of claw pole alternators realized in practice, as well as the models that are more difficult to realize constructively, but, based on simulations and numerical analysis of the field, they are compared to the classic model to increase the production of electrical energy. After numerical analysis, the program created with Magnet 6.1 can automatically change and it creates...
Due to their high efficiency and reliability, permanent magnet synchronous machines are widely used in automotive applications. The present paper deals with the design and analysis of a special topology of a permanent magnet synchronous machine (PMSM) suited for integrated starter-alternator (ISA). A preliminary design procedure is presented and the results are introduced in FEM based software in...
The paper presents a new method for simulation of the cogging torque in a PM machine. The method benefits the numerical functions for modeling the magnetic system of the electrical machine. To compute the cogging torque by the numerical functions, it is necessary to model the permanent magnets and permeance of the machine. In this paper, we introduce two improved numerical functions to model them...
This paper deals with the numerical analysis of a three-phase Small Power High Speed Induction Motor (SPHSIM) with copper rotor cage. The 2D numerical simulations are carried out using the Finite Element Method (FEM) based professional software package Flux. Two numerical approaches of the studied SPHSIM were used in the study, a 2D plane-parallel model and a skewed 2D one. The numerical results are...
Sensorless control of permanent magnet synchronous machines (PMSM) is often carried out by evaluating current ripples resulting from the supply of high-frequency voltage test pulses. Simulations of a sensorless drive are usually based on a state-space model with constant q and d inductances and no mutual inductances. In this paper, this technique is improved by calculating the inductance matrix from...
In this study, a hollow shaft with a hot-fitted motor rotor is considered. The study involves two stages. First, the modal testing is carried out on a bare hollow shaft. The fundamental natural frequencies are used as a reference to ensure the adequacy of the subsequent finite element model of the hollow shaft. Secondly, the modal testing is conducted on the rotor-hollow shaft assembly. The modal...
Gas Foil Bearings (GFBs) are a proven alternative to rolling element bearings for high speed applications. In order to supplies much higher damping and much bigger load capacity, the Large assembly preload is often added in GFBs now, especially in the multi-leaf foil bearings. According to the structure characteristics of the multi-leaf foil journal bearing with large assembly preload, the nonlinear...
This article, first, proposes a dynamic model for flexible rotor using a commercial multi-body dynamic analysis tool, ADAMS. This model is used as a plant model. A novel phase adjusting control technique for rotor is, then, introduced and modeled by SIMULINK. Finally, two models are combined and analyzed. The conclusion of this study is that (a) SIMULINK model for multi-body dynamic rotor is constructed...
In this work a LQR scheme for vibration control in a rotor system is presented. The rotor system has two disks in an asymmetrical configuration along the shaft and its model is obtained by applying finite element techniques. A reduced order model of seven degrees of freedom is experimentally validated for the synthesis of active LQR control laws, using both an output feedback (one disk displacement)...
This paper shows the reliability of fault detection on electrical machines by analysis of the low frequency magnetic stray field. It is based on our own experience about magnetic discretion of naval electrical propulsion machine. We try to apply the techniques developed in previous works on the subject to faults detection. In this paper we focus on rotor defaults in a synchronous generator (eccentricity...
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