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Due to the increasing demand for highly efficient power electronic converters, a detailed design targeting each individual circuit component like magnetic components is getting more and more important. Several electric and calorimetric methods for the loss measurement of magnetic components are known from literature. Nevertheless, only the last approach can be used to properly perform measurements...
This paper presents a new torque ripple minimization technique for a Switched Reluctance Generator (SRG). Although the SRG has many advantageous characteristics as a generator, it has not been widely employed in the industry. One of the most notorious disadvantages of the SRG is its high torque ripple. In this paper, a non-unity Torque Sharing Function (TSF) is proposed to minimize the torque ripple...
Multiple phase bidirectional DC/DC converters are developed and analyzed for optimal inductor operation, high efficiency and a low current ripple. Partial-load operational mode is investigated as well. The different opportunities to degrease the size of the inductors and current ripple and to increase the efficiency are discussed.
In this paper, a systematic procedure is presented, how to predict the AC resistance of litz-wire windings considering air gap fringing fields. For this purpose, an equivalent complex permeability model is derived for hexagonally packed wires. It is shown, how finite element method (FEM) can be used to determine the real as well as the imaginary part of the complex permeability with the copper filling...
Partial discharges (PD) are widely known to occur in medium- and high-voltage applications. Recently, it has been observed that owing to the use of modern variable frequency converters, an environment that contributes to partial discharges is also found in low-voltage motors. Low-voltage machines are vulnerable to partial discharges because their winding insulation is not designed to withstand the...
This paper proposes an effective approach to detect, isolate, and identify fault severity and post fault operation of permanent magnet synchronous motors (PMSM) in the presence of stator winding turn fault. The paper proposes fault tolerant operation of PMSM under post condition with stator winding turn fault by using grounded neutral point through controllable impedance using artificial neural network...
The paper considers on-board battery charging of electrical vehicles (EVs) using a multiphase voltage source and a multiphase propulsion motor. The multiphase inverter and the multiphase machine are fully integrated into the charging process. The proposed integrated on-board battery charger has an advantage of unity power factor operation with no torque production in the machine during the charging...
During the first steps of machines design, engineers have to choose the topology the most appropriate to the specifications. The topology includes the number of stator's slots, the number of rotor's poles and the winding associated. Traditionally, designers choose one of the common used topology in the industry and consequently, a lot of solutions are not studied. In fact, the performances of the...
It is necessary to take the parasitic elements of passive components into consideration in order to predict generated EMI noise of converters and power electronic systems. Parasitic capacitances in magnetic components usually form the major coupling path. Therefore these capacitances must be known in order to predict the noise generation by simulation. This paper presents a dynamically adapting equivalent...
In power electronic converters soft switching is an efficient way to reduce losses. A resonant tank in series with the windings of the isolation transformer in a Modular Double-Cascade converter is presented. Positive effects such as switching loss reduction, prevention of flux walking and saturation of transformer core are analyzed and discussed.
This paper presents a new carrier signal based approach for motion sensorless control of electrically excited synchronous machines. In the case of permanent magnet synchronous machines sensorless control at standstill and low speed is mostly done by injecting a high-frequency voltage and evaluating the resulting current response. Hence, the stator is used as the transmitter and as the receiver of...
The development of micro-inductors is still a challenge to improve the integration level of low power DC-DC converters. The temperature rise due to self-heating or higher ambient temperature represents a risk for system operation. Unfortunately, the use of a heat sink increases the size of the converter and it is more difficult to extract the heat flow dissipated from a smaller area. The increase...
This work proposes a model for induction machines in natural coordinates “abc”, developed considering the nonlinear characteristics of saturation. Traditionally, the models for the induction machine including this effect make use of linear transformations. However, the nonlinearity of saturation does not allow the use of these transformations, giving invalid results. Flux linkage in each phase leads...
Due to the challenge for sensorless control of concentrated windings (CW) interior permanent magnet synchronous machines (IPMSMs), this paper presents the analysis of a novel stator IPMSM for sen-sorless control based on high-frequency rotating voltage signal injection method. The topology of the machine is introduced and the new IPMSM has the advantage of less space harmonics. The sensorless control...
This paper presents an optimal design procedure for pulse transformers fed by power converters for supplying pulsed current magnets in particle accelerators. Usually their volume must be minimized because of limited space available in the accelerator tunnel. Analytical and numerical models are presented as well as an experimental validation and a real case study where the design tool is exploited...
Copper loss calculation in switched reluctance machines is important to predict efficiency and to predict temperature hotspots in the machine. Established calculation methods for alternating current (AC) copper losses are either inaccurate or time consuming. This paper presents a tool chain for copper loss calculation which enables fast and accurate model building and simulation procedure. Employment...
The high cost of Electric Vehicles (EVs), their low driving range and their long charge time limit the automotive market share. In this paper, a new concept of slow/fast low-cost on-board battery charger for EV or plug-in hybrid EV, developed by Valeo, is presented. The major innovation is that a same converter device operates in the charger and traction modes. In charger mode, the electric machine...
A prototype of the hydroelectric pumped storage power plant with 2.4 MW asynchronized generatormotor and frequency converter has been produced. The computer models of the system have been developed. The experimental study of high-frequency parameters of the generator-motor windings have been carried out. The assessment method of the machine additional energy losses caused by converter voltage distortions...
The paper deals with problems of cylindrical rotor synchronous machine excitation winding, its design and analyses of resulting excitation magnetic field. Furthermore it includes possibilities of suppression of harmonic components using suitable stator winding topology.
The present paper deals with the modeling in high frequency of AC machines windings, when the coils are subjected to fast slopes of MLI voltage. The purpose of this study is twofold: firstly, to develop a network of the electrical circuit, and secondly, to effectuate a behavioral analysis. The different elements of this network will be identified by Finite Element Calculations thanks to COMSOL MULTIPHYSIC...
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