Automated methodology for adjustment of component values in passive converter circuit for wind turbine generators

The current paper proposes an automated design approach for a previously developed passive converter circuits for wind turbine generators. This suggested approach allows to calculate the components for all passive converter circuits approved in European patent number PCT/EP2010/055637, where only minor changes in the source code of the mathematical and simulation software have to be made when different circuits are involved. An optimisation based on steepest descent method results in power/frequency (power/speed) curve that matches well the cubic dependence (Pwtmax~ω3) of the extracted power

Model of Piezoelectric Polymer Energy Harvesting System

Тhis paperproposes a specialized model of an energy harvesting system powered by a piezoelectric polymer element. The model allows a complex system based evaluation and can be used as a general design tool. The model is implemented into a general purpose simulation environment. The simulation results are presented and analysed. The model is verified trough a dedicated experiment

Two wire position signal conversion for Brushless DC motors

The paper presents a two wire position signal converter for sensored BLDC motors. The suggested topology aims at reducing the number of lines necessary for connecting the sen-sors of a BLDC machine to the control circuitry. The designed topology keeps a simple and reliable structure. A current based conversion is used, which utilizes the sensor’s power sup-ply connection. The presented structure is analyzed and experimental results are presented. The topology is advantageous for applications where the high number of wires (5 in normal connection) is undesired – such as hub motors in electric vehicles