This paper presents a procedure for optimization of the switched reluctance drive, in order to achieve required torque-speed characteristics. SRM configuration and characteristics are given, and experimental verification of the modeled characteristic is presented. Genetic algorithm (GA) was used for optimization of turn-on angle, turn-off angle and voltage, which represent basic control inputs. The achieved results suggest that the machine's geometry should be optimized as well.

This paper presents a concept design of a hybrid renewable energy system (HRES). The proposed HRES design specifies the operation of the following units: a pumped-storage hydro power plant, a wind power plant and a solar power plant. Since the pumped-storage hydro power plant represents the most complex entity of the HRES, special emphasis is placed on its two control loops: the water tank level control loop and the load-depended frequency control loop. Models of these control loops provide the means for efficient controller design and implementation. In order to achieve effective energy distribution and reliable power supply of the consumers, a switch logic architecture has been developed. Since the HRES's final energy production highly depends on the process of energy conversion, the performances of three types of power converters are analysed. This includes the parametrisation, modelling and simulation of such converters. Finally, a graphical user interface (GUI) for purposes of data monitoring, control and supervision within the designed SCADA system, is presented. The proposed HRES design represents the foundation of the system implementation that aims at serving as a platform for research, education and a broad range of projects on renewable energy.

In this paper the static (flux linkage and torque) and steady state characteristics (speed, current and torque) of the switched reluctance motor (SRM) is investigated for four magnetic structures with various combinations of stator and rotor poles: 8/6 (basic configuration), 16/12 (`double poles' configuration), 16/14 and 16/18 (`toothed poles' configurations). The static characteristics are calculated for different rotor positions and excitation currents using numerical finite element method (FEM) for magnetostatic field analysis. Dynamic characteristics are calculated using specially developed software routines in package Matlab/Simulink. The purpose of this paper is to show the effects of the magnetic circuit structures on static and steady state characteristics of the SRM. Validation of the computational methods was carried out by comparing the calculated static and steady state characteristics with the ones measured on 8/6 SRM prototype.

This paper presents a procedure of determination of static characteristics of switched reluctance machines (SRMs). Calculations are realized for two SRM topologies including novel configuration with 8 stator and 14 rotor poles (SRM 8/14). This configuration is based on new pole design formula introduced recently. Flux linkage and static torque characteristics are calculated for different rotor positions and stator currents using two-dimensional finite element analysis (2D-FEA). Simulation results for new SRM 8/14 and conventional SRM 8/6 with the same number of phases and outer dimensions are presented and compared. This comparison shows that new configuration can have better torque density. Therefore, new design approach should be considered to make this type of machines a more attractive for high performance HEV's (Hybrid Electric Vehicle's) drives.

This paper contains computing and measuring results of start-up, step load, braking and reversing performance of the induction motor. Computing of dynamic states was carried out using idealized mathematical model of the induction motor. The measuring of the dynamic characteristics of the induction motor was carried out with U/f power converter. The load of the induction motor is realized with eddy current brake. The results of computing and measuring are presented and compared.

In this paper simulation for educational purpose in the field of electrical machines and electrical drives is discussed. Simulations and animations are bounded to materials of teaching practise in electrical engineering course and thus represent visualized book. In addition to animated programmed materials, each of the eight applications incorporated into the program include fundamental theory background of the matter shown in each application. Program includes many interesting examples which would have been mathematically tedious.

This paper gives on overview of the procedures of determination of static characteristics (flux linkage, magnetic coenergy and torque), steady state characteristics (current and torque) and dynamic characteristics (speed, current and torque) of switched reluctance motor. A two dimensional distribution of magnetic vector potential inside a motor is computed using finite element method. The flux linkage, magnetic coenergy and static torque are calculated for different rotor positions and stator currents. Steady-state and dynamic characteristics are calculated using specially developed software routines. All calculations are realized for switched reluctance motor with 8 stator and 6 rotor poles. Numerically obtained results are verified by experiment.

The paper first describes a model for computing the dynamic behaviour, in particular the running torque waveform (transient or quasisteadystate), of a switched-reluctance (SR) motor under a variety of excitation conditions. An experimental method for determining the torque ripple is presented and its use for verifying the model is discussed. The computation is based on a published method for integrating the nonlinear differential equations of the SR motor. The experimental method determines the running torque waveform from current waveform measurements under running conditions and static torque measurements. Allowance is made in the measurements for mutual phase interaction in shared parts of the magnetic circuit. The new method is applicable to other types of machine in which electromagnetic torque is not produced by induction.

The switched reluctance (SR) drive exhibits torque pulsations (ripple) due to: (i) the constructional features of the machine-salient poles on both stator and rotor; and (ii) a switched form of supply. The form and level of torque pulsations are therefore dependent on variables related to the geometrical form of the magnetic circuit and on those related to the phase current waveform. The influence of these variables on torque pulsations can be estimated by sophisticated mathematical models. The authors describe a procedure for computing the instantaneous values of electromagnetic torque exhibiting pulsations. It is assumed that magnetic parameter data (inductances or flux-linkage against position and current) are known, i.e. the data are obtained by measurements in stall conditions or computed by numerical field analysis.