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DC has several advantages over ac. In relation with the changes needed in todays ac power system to deal with dominating amounts of fluctuating renewable energy, it seems wise to consider dc as an alternative. One of the problems with introducing dc grids is the lack of availability of dc devices. DC ready devices that work on both - ac and dc - would simplify a smooth introduction of dc there, where...
The paper deals with a drive system of experimental fully electric airplane VUT 051 RAY with rated power 55 kW. The requirements on accumulator capacity and its weight were defined according to a precisely specified flight profile. The whole design process of traction inverter is presented. Drive train system of electric airplane was completely tested, before its final installation into fuselage of...
The paper deals with internal communication system in experimental fully electric airplane VUT 051 RAY which is controlling the whole drivetrain system. The complex drivetrain system consist of battery blocks, main computer, control system of the traction inverter, control and monitoring panel, several simple control and monitoring devices placed on pilot board and finally control system of fast charger...
Comparing to concurrent small turbojet engines this Czech design has several important parametrical advantages: weight, power, reliability, cost, etc. Innovations were obtained by creative/inventive solutions in which several instruments TRIZ were used objectively. In this article, the turbojet engine is presented as a case study: As an example for teaching the TRIZ methodology to students and engineers...
This paper presents developed compact algorithms of space vector pulse width modulation (SVPWM) for six-switch and four-switch three-phase inverter. Calculations of the desired voltage vector in the PMSM drive are presented, an optimal voltage vector sequence and scaling factors for SVM has been derived to synthesize the reference voltage vector in each sampling period for healthy and fault drive...
The paper presents a comparison of methods of the back EMFs estimation for the permanent magnets synchronous motor in a case of position estimation at the low speed range. These methods are based on the following structures for back EMF estimation: observer for model of the electrical part of the motor, the observer for the modified correction function and estimation based on the simplified model...
The paper presents a concept, development and comparison of selected control algorithms used in distributed control system of a three wheeled vehicle. First simulations are carried out, then the selected algorithms are tested on a real vehicle. The article includes the description of the mathematical model of the tricycle: kinematics, dynamics, motor drives, central control system, communication network...
The paper presents mathematical model of absolute optical encoder with parallel gray output where various parameters of the transducer can be modified (ex. number of bits, asymmetry in output waveforms, lack of signals from selected bits). The model of the non - ideal encoder substitutes the model of ideal position sensor implemented in Matlab/Simulink model of three phase PMSM (Permanent Magnet Synchronous...
This article presents a possible way of calculation of air gap magnetic flux density in induction machines with eccentrically placed rotor. In the text a method of analytical calculation is presented and results are compared with finite element analysis outputs.
This paper deals with the design of synchronous reluctance machine of the transverse-laminated type. Rotor design has been made for two different rotor geometries based on general design recommendations. These geometries are studied and compared by using 2D finite element analysis. The geometries are developed by optimization algorithms after that. The optimized parameters are torque ripple and average...
The most important stress factors for electric machines insulation in the automotive environment can be summarized by the mnemonic expression TEAM (thermal, electrical, ambient, and mechanical stress). Even already each individual of the above mentioned stresses can be fatal for the electric machine insulation they generally act simultaneously making even worse deterioration process and so faster...
To ensure reliable drive with an induction machine requires deep insight in electro-mechanical dynamics during its operation. The flexible multibody modeling technique enables the simulation of dynamic loads on all drive components. This paper focuses on complex modeling of machine's behavior in case of eccentrically placed rotor. The life time of machine's bearing becomes very important issue of...
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