Vol.1, No 10, 2003 pp. 1369 - 1376
UDC 621.316.573:621.3.017
THEORETICAL AND EXPERIMENTAL ANALYSIS
OF THE ENERGETIC LOSSES ON SLIDING ELECTRIC CONTACTS
Anca Popa, Veronica Argesanu
Mechatronics Department, Faculty of Mechanical Engineering
"Politehnica" University of Timisoara
e-mail: agligor@mec.utt.ro
Abstract. The present paper offers important support for the exploitation
of any kind of machine, measuring or mechatronic device, that contains
sliding electric contacts (for information and/or energy transfer). The
novelty consists of a contact study on the couple sintered metal – graphite
brushes with bronze rings, emphasizing the fact that in every case when
the current density and the contact pressure have been maintained, the
electric resistance registers a diminishment, as the relative velocity
decreases. With an increasing current density, the contact resistance suffers
a light decreasing. Despite the fact that the value of the volumic wear
of the brush is situated under normal limits, by maintaining constant velocity
and by doubling the value of the contact pressure, the intensifying energy
loss process leeds to doubling wear of the averted layer.
TEORIJSKA I EKSPERIMENTALNA ANALIZA ENERGETSKIH
GUBITAKA KOD KLIZNIH ELEKTRIČNIH KONTAKATA
Ovaj rad daje podršku u eksploataciji bilo koje vrste mašina, mernih ili
mehatroničkih uređaja, koji sadrže klizne električne kontakte (za prenos
informacija i/ili energije). Novina se sastoji u studiji kontaktnog para
sinterovanog spojenog metala i grafitnih četkica sa bronzanim prstenovima,
uz naglašavanje činjenice da u svakom slučaju kada su gustina struje i
kontaktni pritisak konstantni, električni otpor beleži pad pri smanjenju
relativne brzine. Sa porastom gustine, kontaktni otpor lagano opada. Uprkos
činjenici da je habanje četkice ispod normalnih vrednosti, održanjem konstantne
brzine i dupliranjem vrednosti kontaktnog pritiska, rastući energetski
gubitak dovodi do dupliranja habanja sloja.
