Safdarzadeh, Omid ; Weicker, Martin ; Binder, Andreas (2022)
Transient Thermal Analysis of the Contact in Bearings Exposed to Electrical Currents.
4th International FVA-Conference. Würzburg, Germany (05.07.2022-06.07.2022)
Konferenzveröffentlichung, Bibliographie
Kurzbeschreibung (Abstract)
Electrical bearing currents, e.g. in inverted-fed electrical machines, may disturb the performance of the bearings via damaging (fluting) the raceway surfaces. In this paper the steady-state and transient temperature of the bearing surface at the electrical contact points between the balls and the raceway (a-spots) is derived in the mixed lubrication state, where metal-metal contacts are available. The thermal analysis is presented for electric contact model of Holm and Andreason. First analytical calculations are presented. Then FE-simulations are performed. Temperature-dependency of the electrical resistivity ρ is considered based on Wiedemann-Franz-Lorenz law. Sensitivity analyses for the contact dimensions are presented. The simulation results are compared to the findings of Holm, Andreason and Slade on the temperature-rise in the contact under the electric current flow.
The results are extended to predict the instantaneous contact-surface-temperature at the a-spots in an axial bearing (type 51208) at 500 min-1 with 1 A average bearing current and with an axial bearing force of 800 N. Moreover, the average of the contact-surface-temperature at the a-spots is obtained for the same bearing in a range of operating points, i.e. a speed from 0 min-1 to 3000 min-1, an average bearing current from 0.25 A to 3 A, at an axial bearing-force 800 N. The model can be utilized to predict the instantaneous contact temperature at the a-spots for any given bearing from the measured bearing voltage.
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 2022 |
| Autor(en): | Safdarzadeh, Omid ; Weicker, Martin ; Binder, Andreas |
| Art des Eintrags: | Bibliographie |
| Titel: | Transient Thermal Analysis of the Contact in Bearings Exposed to Electrical Currents |
| Sprache: | Englisch |
| Publikationsjahr: | Juli 2022 |
| Veranstaltungstitel: | 4th International FVA-Conference |
| Veranstaltungsort: | Würzburg, Germany |
| Veranstaltungsdatum: | 05.07.2022-06.07.2022 |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | Electrical bearing currents, e.g. in inverted-fed electrical machines, may disturb the performance of the bearings via damaging (fluting) the raceway surfaces. In this paper the steady-state and transient temperature of the bearing surface at the electrical contact points between the balls and the raceway (a-spots) is derived in the mixed lubrication state, where metal-metal contacts are available. The thermal analysis is presented for electric contact model of Holm and Andreason. First analytical calculations are presented. Then FE-simulations are performed. Temperature-dependency of the electrical resistivity ρ is considered based on Wiedemann-Franz-Lorenz law. Sensitivity analyses for the contact dimensions are presented. The simulation results are compared to the findings of Holm, Andreason and Slade on the temperature-rise in the contact under the electric current flow. The results are extended to predict the instantaneous contact-surface-temperature at the a-spots in an axial bearing (type 51208) at 500 min-1 with 1 A average bearing current and with an axial bearing force of 800 N. Moreover, the average of the contact-surface-temperature at the a-spots is obtained for the same bearing in a range of operating points, i.e. a speed from 0 min-1 to 3000 min-1, an average bearing current from 0.25 A to 3 A, at an axial bearing-force 800 N. The model can be utilized to predict the instantaneous contact temperature at the a-spots for any given bearing from the measured bearing voltage. |
| Fachbereich(e)/-gebiet(e): | 18 Fachbereich Elektrotechnik und Informationstechnik 18 Fachbereich Elektrotechnik und Informationstechnik > Institut für Elektrische Energiewandlung > Elektrische Energiewandlung 18 Fachbereich Elektrotechnik und Informationstechnik > Institut für Elektrische Energiewandlung |
| Hinterlegungsdatum: | 07 Nov 2022 14:00 |
| Letzte Änderung: | 07 Nov 2022 14:00 |
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