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This paper simply investigates experimentally multiple “rotor” bar current waveforms at standstill, on a dedicated inverted induction motor prototype as a basis to analyze the bar currents distribution in the symmetrical and unsymmetrical cage. A phasor calculus scheme based on primary magneto-motive-force space harmonics is developed to explain this asymmetry of bar currents system at standstill...
The goal of this paper is to develop a S-function in MatLab Simulink for a symmetrical induction machine with squirrel cage rotor, in abc coordinates, for having direct access to rotor bars currents. We also use the circuit equivalent method (MEC), for having a hybrid mathematical model. This hybrid model is a simplified combination between abc frame model and MEC For the simulation model of induction...
This paper presents a new approach of lifetime and loading stress level estimation for Multilayer Ceramic Capacitors (MLCCs) to design a reliable Electronic Control Unit (ECU). These components are widely used in automotive ECU to perform functions as filtering, timing, buffering or noise reduction. The lifetime estimation is concerned to define the behavior of MLCCs over their lifespan in required...
One major research topic in the PFC rectifiers area is represented by efficiency improving methods, while maintaining the unity power factor. In this paper, the single stage PFC rectifiers, namely the SWISS and 8-switch topologies, are investigated. New control strategy for the 8-switch rectifier proposed in [7] is introduced. Further, an interleaved switching strategy that enables cancellation of...
The problem of interpolation a set of data is an old one, but the demanding of flexibility and high speed in operating on-line and in real time processing need to find new methods and improve the old ones [1]. The main properties of B-spline functions offer the possibility to implement algorithms of interpolation in a faster and optimal manner. A function can be represented by B-spline functions with...
District heating is largely used today in many Romanian cities. But, having an efficient heating system on such a large area means introducing an adequate command, control and measuring system, too. Due to the continuous limitation of resources and also due to the high price of the energy, the measurement and the management of the heating agent is a real priority for the power plants and also for...
In the last two decades, a great part of research in the power electronics area has been involved in finding methods of improving the input current waveform while simultaneously avoiding phase displacement. The aim of the paper consists of selecting two of the most relevant single phase power factor correction (PFC) topologies currently existing for the power range of 1.5 kW up to 4 kW and to analyse...
The main drawback related to the PFC converters is the increasing of the electromagnetic interference (EMI). Thus, the high frequency noise must be filter out in order to ensure compliance with EMI European standards (EN 1000-3-2 or EN 1000-3-4). The paper investigates two topologies: the conventional boost PFC converter and the bridgeless boost PFC converter. A proper filter is designed and its details...
Within metallic or insulated objects or vehicles, overhead power line electric field induces potential that could become dangerous when human beings are in contact with. Also, for human beings that are working within electric or magnetic concentrated fields, biological perturbations could occur. A power quality and environment impact remote-measuring system is presented within the paper. It provides...
This paper proposes an original method of determining the maximum power function of a wind turbine at variable wind speeds. In this paper we determine the speed at which the system must work in order to obtain a maximum amount of electricity in a time interval of hours and days. For this purpose, we measure the wind speed and knowing the mechanical characteristic of the turbine, we calculate the optimum...
This paper deals with a current control method of a 8/6 Switched Reluctance Motor using a DSP TMS320C24×. The power converter used in the experiments was a classic one, with two transistors per phase. The current is sensed using two sensor resistances, one for a pair of phases. The current is measured only if the two transistors of the same phase are on. The current control loop is performed using...
The inherent vulnerability to mechanical failures, extra cost, and size associated with external position sensors such as optical encoders and Hall sensors has motivated many researchers to develop sensorless control techniques for SRM drives. In this paper a flux linkage method and dual layer controller is developed to estimate rotor position and speed of a low-voltage Switched Reluctance Motor (SRM)...
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