Title :
Experimental evaluation of the endangerment of ball bearings due to inverter-induced bearing currents
Author :
Muetze, A. ; Binder, A. ; Vogel, H. ; Hering, J.
Author_Institution :
Darmstadt Univ. of Technol., Germany
Abstract :
Statements on the mechanism of the endangerment of bearings due to inverter-induced bearing currents nearly do not exist today. Therefore, a series of 22 test runs for bearing damage assessment was carried out. The influence of bearing current amplitude and type, calculated apparent bearing current density, time of operation and inverter switching frequency on bearing damage was investigated. The degree of electrical bearing stress "W" was introduced. The degree of melting of the bearing race surface and the grade of reduction of the carboxylic acid, which is an indicator for the deterioration of the grease, depend on W.
Keywords :
ball bearings; current density; greases; insulated gate bipolar transistors; invertors; power semiconductor switches; stress effects; switching convertors; variable speed drives; ball bearings; bearing current amplitude; bearing current density; bearing damage assessment; bearing endangerment; bearing fluting; bearing race surface; carboxylic acid; electrical bearing stress; grease deterioration; inverter switching frequency; inverter-induced bearing currents; variable speed drives; Ball bearings; Current density; Current measurement; Degradation; Insulated gate bipolar transistors; Inverters; Stress; Switching frequency; Testing; Variable speed drives;
Conference_Titel :
Industry Applications Conference, 2004. 39th IAS Annual Meeting. Conference Record of the 2004 IEEE
Print_ISBN :
0-7803-8486-5
DOI :
10.1109/IAS.2004.1348741
