Wyniki wyszukiwania - BazTech

1

Lewitacja magnetyczna

Hering M.

Śląskie Wiadomości Elektryczne

|

2018

|

Nr 4 (120)

17--21

PL

Istnieje wiele odmian lewitacji, w tym między innymi: magnetyczna, oparta na sile wyporu, aero- i hydrodynamiczna, elektrostatyczna, akustyczna, optyczna. Jeśli obiekt podtrzymywany jest mechanicznie w jednym ze stopni swobody mówi się o quasilewitacji, natomiast gdy mamy do czynienia z lewitacją opartą na kilku różnych zjawiskach nosi ona miano hybrydowej. Spośród wymienionych sześciu odmian lewitacji największe znaczenie praktyczne ma lewitacja magnetyczna i w niniejszym artykule ona została scharakteryzowana.

EN

There are many kinds of levitation including: magnetic, based on buoyancy, aero-and hydrodynamic, electrostatic field, acoustic and optical ones. If the object is mechanically kept in one of the degrees of freedom, it is said about quasi levitation, whereas when we deal with levitation based on several different phenomena, it is called a hybrid levitation. Of the six kinds of levitation mentioned above, the greatest practical significance has the magnetic levitation and it was characterized in the paper.

2

Analysis and simulation of different types of power amplifiers used in electromagnetic levitation system

Debnath S., Biswas P. K., Das U.

Journal of Power Technologies

|

2018

|

Vol. 98, nr 2

220--227

EN

The objective of this paper is time and frequency response analysis of single quadrant and two-quadrant power amplifiers by using MATLAB SIMULINK, PSPICE and PSIM based software used in the electromagnetic levitation system. The power amplifier plays a key role in controlling the electromagnetic levitation system, controlling the current as well as the force between electromagnet and rail. Here the power amplifier is used to convert a fixed DC voltage to an adjustable DC output voltage. Different kinds of power amplifiers have been proposed for the electromagnetic levitation system. In this paper, only buck and asymmetrical converters are simulated in the simulation software. The exciting current of the electromagnet is controlled by the power amplifier, which controls the air gap and force between actuator and rail in a closed loop manner. PSPICE is an analog and digital circuit simulation software. PSIM is a general-purpose analog and digital electronic circuit simulator. It is also used for simulation and design software for power electronics, motor drives, and dynamic system simulation. SIMULINK is the graphic user interface software from MATLAB which helped us prepare the model of the various power systems, power electronics and control system.

3

Positioning of electromagnetic levitation device in case of levitating plate perforation

Stępień S., Kołota J.

Journal of Applied Computer Science

|

2009

|

Vol. 17, nr 1

117-132

EN

This research presents a voltage control method of an electromagnetic levitation device. Finite element method is used to model the device known as Team Workshop Problem 28. Double Proportional-Integral-Derivative controller of sinusoidal voltage amplitude is applied to the levitator positioning. Both the levitation device and the controller equations are coupled and solved in the control loop. The model for solving the control problem is presented. In the numerical example a relationship between the position and the sinusoidal voltage amplitude applied on coils for given positions is determined. Also as an additional contribution an impact on perforation of the levitating plate on the device positioning is examined

4

Falownik klasy E - teoria i praktyka przekształtnika wysokiej częstotliwości

Kaczmarczyk Z.

Przegląd Elektrotechniczny

|

2004

|

R. 80, nr 9

817-820

PL

W artykule przedstawiono uzasadnienie tendencji podwyższania częstotliwości pracy falowników, opisano podstawowe właściwości i zasadę działania reprezentatywnego falownika klasy E. Dokonano przeglądu literatury, ilustrującego obszar możliwych zastosowań tego typu falowników. Wybrane realizacje praktyczne falowników klasy E zostały szczegółowo scharakteryzowane, przedstawiając ich częstotliwości pracy, moce, sprawności oraz zastosowania.

EN

A justification of a tendency to increase in operating frequency of inverters and a description of basic properties and operation principle of a representative Class E inverter are presented in the paper. Next, an application area of such kind of inverters is delivered based on literature data. Selected fabricated Class E inverters are described in details and their operating frequency, power, efficiency and application are tabulated.