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1

Modelling of Eletromagnetic Actuators for the Intake & Exhaust Valves of Automobile Engines

Nitu C., Nitu S., Gramescu B., Alionte C.

Machine Dynamics Problems

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2004

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Vol. 28, No. 4

47-53

EN

The main objective of the work was the development of a distribution system for thermal engines, electrically actuated and electronically controlled, aimed to replace the classical system with cam-follower mechanism. The work consisted of design, modelling and simulation of an electromagnetic actuator, able to drive a valve with certain dynamic performances, within the desired stroke and development of an experimental system including electronic control and software.

2

Modeling of Discharge Phenomena in Electromechanical Switching Devices

Nitu S., Nitu C., Pavelescu D.

Machine Dynamics Problems

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2004

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Vol. 28, No. 4

55-61

EN

Mechatronic approach is the most appropriate one for all multidisciplinary systems, involving different physical phenomena. In low voltage switching devices, the dynamic behavior of the electric and mechanical subsystems is strongly correlated with arc discharges taking place in vacuum (10⁻⁷ ...10⁻¹⁰ bar). In order to preserve the safety operation of all the consumers of a power supply, the discharges must extinguish at the first passing through zero of the current. The existence od axial or/and radial magnetic field can improve the behavior of the discharge. By modeling the electromagnetic field in the vacuum chamber and the phenomena within the plasma column between the two contact parts, the authors want to predict the behavior of the electromechanical switching device, in order to know thermal, electrodynamic and dielectric stress of the entire electric setup.

3

An improved analytical model for electromagnetic actuators design

Nitu C., Nitu S.

Elektronika : konstrukcje, technologie, zastosowania

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2004

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Vol. 45, nr 8-9

47-49

EN

The paper presents theoretical development and experimental analysis of electromagnetic actuators, as mechatronic devices. Mechanical, electrical and magnetic equations are derived and solved for specific configurations. The results and the algorithm are tested and confirmed by experiment.

PL

W artykule przedstawiono rozbudowę na drodze teoretycznej oraz analizę doświadczalną siłowników elektromagnetycznych jako urządzeń mechatronicznych. Dla poszczególnych konfiguracji wyprowadzono i rozwiązano mechaniczne, elektryczne oraz magnetyczne równania. Uzyskane rezultaty oraz algorytm zostały przetestowane, a ich poprawność potwierdzona eksperymentalnie.