Abstract

In the process of validation of crimped connec-tions, the determination of the connector resistance factor and of the initial scatter coefficient has a decisive role. In this paper is studied the impact of the experimental meas-urements accuracy on the calculation of initial scatter, cu-mulating data from various types of crimped connections. This coefficient provides information on the behavior of the crimped connection immediately after installation before any aging effect begins. The standards establish that 6 sam-ples are sufficient to be tested to estimate the identification of a “family” of connectors. The measurements were per-formed on crimped connections of barrel of terminal lug type for three cross sections of cables and on crimped con-nections of bimetallic through connector type for two pairs of cross sections. The initial scatter is influenced by 6 repre-sentative measured quantities as voltage drops, currents and conductor lengths. First, it was imposed a variation by one unit of hundredths digit of initial scatter and was recorded the variation of each quantity, the others 5 quantities being kept constant. Then simultaneous variations of the 6 quanti-ties caused by device reading errors were imposed, deter-mining the quantities with the greatest influence on initial scatter. Useful recommendations for experimenter are made.

Abstract

In this paper, the rotor field-oriented control is applied for a three-phase induction motor used in electric traction of an autonomous locomotive powered by a battery. First, the operating equations in the rotor field-oriented system are introduced. Then, the control scheme based on the structural scheme and operational equations are pre-sented. After referring to the design of the controllers, the performances of the control system during the start-up pro-cess by prescribing a ramp speed and step rotor flux are addressed and analyzed. Four values of the prescribed speed are taken into consideration. Through the presented results, the synthesis of the control system and control algorithm are validated.

Abstract

Wireless (contactless) transfer of electric power is a disruptive technology because it abandons wired transmission technology, the only technology used in electrical and electronic engineering until recently, just like in the past animal traction and film photography were replaced by mechanical traction and digital photography. Although revealed at the end of the nineteenth century through Tesla’s inventions, it could be applied in practice only in the ‘80s of the twentieth century, with the development of power electronics and microprocessors. After an introduction and an overview of the operating principles, the paper presents the readiness level reached by this technology, the stage of standardization, Romanian achievements and future prospects for high power applications.

ANNALS OF THE UNIVERSITY OF CRAIOVA – Electrical Engieneering Series, no. 45, vol. 45, Issue 1, 2021 (click to download)

Wireless Transfer of Electric Power – a Disruptive Technology – Andrei Marinescu

Application of the Rotor Field-Oriented Control for an Induction Motor Used in Electric Traction – Mihaela Popescu, Alexandru Bitoleanu, Constantin Vlad Suru

Impact of Experimental Measurements Accuracy on Validation Process of Crimped Connections – Alin-Iulian Dolan, Constantin-Florin Ocoleanu

Real-Time Sensorless Control of the PMSM based on Genetic Algorithm, Sliding Mode Observer, and SCADA Integration – Claudiu-Ionel Nicola, Marcel Nicola, Maria-Cristina Niţu, Dumitru Sacerdoţianu, Ancuța-Mihaela Aciu

The Choice of the Main Power Components in Electric Traction Converters – Lavinius Sorin Goreci, Mihaela Popescu, Ion Tilă

Optimization of Electromagnetic Devices using a RSM Enhanced ACOR Algorithm – Anton Duca, Bianca Lamba

Comparative Analysis of Two Methods of Calculating the Prescribed Current in a Shunt Active Filtering System – Mihăiță Daniel Constantinescu, Mihaela Popescu, Constantin Vlad Suru

Automatic Ventilation and Air Conditioning System for Educational Training – Ionel Laurenţiu Alboteanu, Andrei Cosmin Militaru

Considerations on the Disturbances Occurred in the Operation of Medium Voltage Electrical Networks with Neutral Treated by Suppression Coil – Silvia-Maria Digă, Nicolae Digă, Paul-Mihai Mircea, Ion Marin

Experimental Study of HBC Fuses with Aluminium Fuse Element at Minimum Rated Breaking Current, Maximum Rated Breaking Current and Transfer Current of Fuse-Switch Combination – Cristian-Eugeniu Sălceanu, Marcel Nicola, Daniel Ocoleanu, Daniela Iovan, Sorin Enache

Simulation of Multi-Motor Propulsion System for Energy Efficiency in Electric Vehicles – Cristian-Liviu Popescu, Laureţiu Marius Dumitran, Alexandru Stănescu

Ways to Determine the Structural Resource of Highly Maneuverable Aircraft – Nicolae-Alin Niculescu, Jenica-Ileana Corcău, Nicuşor Cătălin Stancu

Two Numerical Studies for Longitudinal Movement of a Canard UAV with Vectored Thrust – Liviu Dincă, Jenica-Ileana Corcău, Dionis Cumpan