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Structural diagram of the built-in diagnostic system for electric drives of vehicles

Gubarevych Oleg, Goolak Sergey, Melkonova Inna, Yurchenko Mariia

Diagnostyka

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2022

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Vol. 23, No. 4

art. no. 2022406

EN

Currently, in transport systems, as part of the main and auxiliary equipment, a large number of induction motors with a squirrel-cage rotor of different capacities are used. Their wide application in the transport industry is associated with the main advantages over other types of machines – a fairly high reliability, low cost and ease of maintenance. However, during the operation of these motors, a number of malfunctions can occur that affect the deterioration of the performance of the entire drive, the accuracy of its functions, or accelerate an emergency stop. To ensure proper control of the technical condition of electric motors, modern diagnostic systems are required that operate in real-time and operational loading mode with the transmission of data on the instantaneous state of the main control elements. The paper proposes a block diagram of the diagnostic built-in system and developed a modular unit for it to set the type and degree of the most complex damage - inter-turn short circuit in the stator winding.

2

On the detection of distributed roughness on ball bearings via stator current energy: experimental results

Curcuru G., Cocconcelli M., Immovilli F., Rubini R.

Diagnostyka

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2009

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nr 3(51)

17-21

EN

This paper deals with the detection of distributed roughness on ball-bearings mounted on electric motors. Most of the literature techniques focus on the early detection of localized faults on bearing (e.g. on the outer ring) in order to determine the bearing life and to plan the bearing replacing. Localized faults can be detected because they have characteristic signatures which is revealed in the frequency spectrum of the vibration signal acquired by an external sensor, e.g. accelerometer. Unfortunately other faults exist which do not have a characteristic signatures and then they could not be foreseen accurately: e.g. the distributed roughness. In this paper the motor stator current energy is proposed as a fault indicator to identify the presence of the distributed roughness on the bearing. Moreover an orthogonal experiment is set to analyse, through a General Linear Model (GLM), the dependencies of the current energy to the roughness level, and two environmental conditions: the motor velocity and the loads applied externally. ANOVA investigates the statistical significance of the considered factors.

3

Remontować czy wymieniać stare silniki elektryczne średniej i dużej mocy?

Bernatt M.

Napędy i Sterowanie

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2003

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R. 5, nr 12

44--47

PL

Silnik elektryczny indukcyjny należy uznać za wyrób tani: koszt zakupu nowego silnika klatkowego równoważy się z kosztem kilkunastomiesięcznej eksploatacji. Silniki elektryczne starzeją i zużywają się z reguły szybciej niż napędzane nimi urządzenia mechaniczne. W rozwiniętych krajach Europy przeciętny okres eksploatacji silników indukcyjnych klatkowych o mocy powyżej 250 kW wynosi nie więcej niż 20 lat. W tym okresie silnik bywa jeden lub dwa razy przezwajany, natomiast eksploatacja silników starszych niż 20-letnie uważana jest za technicznie i ekonomiczne nieracjonalną. Spodziewany okres dalszej bezawaryjnej pracy dwudziesto-letniego silnika jest kilkakrotnie mniejszy niż silnika nowego.