Florin Jurca

Electrical Machines Virtual Laboratory: Grid Connection of a Synchronous Generator

Virtual laboratories can become important components of the teaching process, because using them several experiment-oriented problems can be solved easily and also from the distance. Graduates using virtual laboratories will be better trained when they enter the job market. In the paper a laboratory work will be presented having two components: a simulation and an experimental module. Both can be used for the preparation of a real lab and for accessing the real-world experiments. The virtual lab modules can also allow multiple students to remote access the experiments, the multicast data transfer mechanisms and arbitration mechanisms

Axial-flux vs. radial-flux permanent-magnet synchronous generators for micro-wind turbine application

This paper presents a comparative study between the axial-flux and radial-flux permanent-magnet synchronous generators for a 3 kW wind turbine application. This study emphasizes the most cost-effective solution to be implemented by the industrial partner. There are three constructive types of electric generators considered in this work. All are based on permanent-magnet synchronous generators (PMSGs), but one has an axial-flux topology, the other one is a radial-flux outer-rotor machine and the third one is a radial-flux inner-rotor machine. Finite-element field analysis was made for the three PMSGs in order to compare their efficiency and active materials estimated cost. The results show that the axial-flux PMSG is the best solution for micro-wind turbine application.

Design and testing of a four-sided permanent magnet linear generator prototype

In the perspective of the fossil fuels deposits depletion new energy resources must be developed; amongst them the renewable energy sector seems to be able to provide a long term solution. Besides the already popular wind, solar or thermal energies, the ocean energy sector offers a virtually infinite energy potential; many solutions for harvesting and converting this energy into usable form are under investigation, most of them using complex mechanical or hydraulic systems to convert the slow, linear movement specific to waves into rotational movement, compatible with the classical electric generators. Our focus is on systems using linear electric generators, offering higher efficiency and reliability, the present paper presenting the stages covered to choosing, designing, building and testing a linear generator.

Simulation of Wind Turbine Driven Autonomous Squirrel Cage Induction Generators

Due to increased emphasis on renewable resources, the development of suitable isolated power generators driven by energy sources such as wind, small hydro-electric, biogas, etc. have recently assumed greater significance. The capacitor self-excited squirrel cage induction generator has emerged as a suitable candidate of isolated electrical power sources. In this paper such a system is studied both by means of laboratory tests and by simulation.

Permanent magnet linear generator for renewable energy applications: Tubular vs. four-sided structures

While the exhaustion of carbon based fuels has become a certitude, the use of alternative fuels became more popular in the last decades. The renewable energy sector emerged, providing an alternative to conventional energies; amongst them the wind and solar energies became extremely popular in the last decades, supplying important parts of the total energy required in countries like Germany or the United States of America. Besides these, the wave energy sector represents a huge, yet unexploited domain, which could prove to be a long time solution for the forthcoming energy shortages.

Fault tolerant switched reluctance machine for wind turbine blade pitch control

The papers goal is to accomplish a study regarding the usefulness of a fault tolerant machine in wind turbine pitch control. The pitch control both helps to catch the wind at the optimal angle of attack of the blades airfoil and to turn the blades out of the wind when maximum speed is exceeded. To fulfill this assignment electrical machines are used to control the blades pitch angle function of winds speed. The faults that can occur in electrical machines can stop the pitch control system, decreasing drastically the efficiency of the wind turbine. Fault tolerance ability of the pitch controlling machines can avoid such issues. In the paper a fault tolerant switched reluctance machine is studied. As it being simple and cheap it is optimal for such vital applications. Numerical field computations were used to analyze the machines behavior. An advanced cosimulation was performed by coupling two simulation programs in order to study the machines drive system and fault tolerance capacity.

Design and control of synchronous reluctances motors for electric traction vehicle

The paper present the analysis of the performances of an electrical machine used for electric traction in automotive application. The electrical machine under study in this paper is a flux synchronous reluctance machine (SynRM) with 4 poles and 27 slots. The study design requires some analytical analysis in SPEED program, followed by a numerical one in order to obtain the performances of the proposed machine. The control strategy of this machine was also presented.

Synchronous reluctance motors for small electric traction vehicle

The paper present the analysis of the performances of an electrical machine used for small power automotive application. The electrical machine under study in this paper is a small flux synchronous reluctance machine (SynRM) with 4 poles and 24 slots. The analysis of studied machine will be carried out both analytically and numerically in SPEED program and Flux (2D and skewed solver).

Axial flux interior permanent magnet synchronous motor for small electric traction vehicle

The paper presents an analysis of performances for studied electrical machine designed for the propulsion of a special electric vehicle. This special vehicle is an electric scooter, usually used by people with physical disabilities. This particular electric scooter can be used by elders as well, offering them greater mobility, since, due to their physical health they are becoming more isolated in society. The electrical machine under study in this paper is axial flux permanent magnet synchronous machine. The analysis of the studied machine will be made analytically, numerically and experimental. The obtained results of the proposed solution will be related to a special electric scooter, powered by a dc motor, bought from the market.

Comparative analysis of the claw-pole rotor dimensions influence on the performances of a claw -pole generator for wind applications

In small ratings, direct-driven wind power applications multiple permanent magnet generators have become very attractive. Connected directly to the turbine axis, this type of electrical machine contributes to low price energy (the energy loss is diminished through the conversion, the turbine performance is increased) and to the reduction of the noise - this would be a very important aspect in case the turbine is placed nearby the localities. The present paper approached the magnetic field analysis of a claw pole permanent magnet rotor topology for a synchronous machine, suitable for small wind power application, by means of the 3D finite elements method.