Alexandru Onea

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The aim of this paper is to present a holistic approach to modeling and field programmable gate array (FPGA) implementation of a permanent magnet synchronous motor (PMSM) speed controller. The whole system is modeled in the Matlab Simulink environment. The controller is then translated to discrete time and remodeled using System Generator blocks, directly(More)
The discrete-time linear quadratic optimal problem with finite final time for a servo-drive system with a brushless or a dc motor is presented. The proposed algorithm allows simplifying the optimal control law implementation. The optimal control ensures a good behavior of the system and the decrease of the energy consumption. Key-Words:Optimal control,(More)
This paper presents an optimized FPGA implementation of the 5 step modified space vector modulation algorithm. The algorithm is modeled in Matlab Simulink using System Generator software from Xilinx. After validation through simulation, the algorithm is translated into a synchronous hardware automaton and then implemented in a low cost Spartan-3E FPGA(More)
In this paper, a method for colour image comparison is proposed. An indexation step is performed using a Kohonen neural network, with the SOM (Self Organizing Map) algorithm. Therefore, a colour image in the Red, Green, Blue (RGB) space is interpreted as a 256 colour image. The comparison step, between two indexed images, is based on a global dissimilarity(More)
The control of a three phase AC motor is performed with a three phase inverter. A key role in the correct functioning of the inverter is the used modulation technique. In this paper is proposed a class of modulation algorithms for the three phase inverters which have the advantage of a very simple implementation. The equivalence between a modulation(More)
This paper presents a passivity based torque control structure for a high power Permanent Magnet Synchronous Motor (PMSM) used in Electric Vehicles (EV). A comparative study is done with a parallel PI algorithm in terms of response time, settling time, stationary error and required input electrical energy to reach the desired operating point. Moreover,(More)
The present paper discusses the pressure loss through the spiral heat exchanger (HX) proposed in the ELSY (European-Lead cooled SYstem) project. An approach based on CFD (Computational Fluid Dynamics) using the commercial code ANSYS CFX has been used for exploring the flow through the HX. The HX consists of perforated double inner and double outer walls, as(More)