The Failure of an Electric Engine Caused by the Seizure of the Porous Bearing

Abstract

In the article, the investigative results of the elements of the electric engine, after failure, are described. A preliminary inspection showed that the engine breakdown was caused by the seizure of one of the porous bronze bearings mounted in the electric motor. The analysis of the results showed that the probable reason for the seizure was the presence of brown dust. The seizure process occurred only in bearing No. 2 and it was connected to its location within the structure of the air conditioner.

An experimental and signal analysis workflow for detecting cold-induced noise emissions (cold squealing) from porous journal bearings

“…• C must be kept, since operation has to remain possible in cold regions as well as in the hot engine compartment [5,6]. References [2,7] reported the occurrence of noise in porous journal bearings when certain types of lubricants are used, but their tests focused on high-temperature operation only.…”

An experimental and signal analysis workflow for detecting cold-induced noise emissions (cold squealing) from porous journal bearings

“…Providers of automobile parts wish for smoothly running bearings, in particular the prevention of so-called "cold squealing" at temperatures below -20 • C, so choosing the right combination between bearing material and lubricant is crucial. On the other hand, the full functionality and the service life of the bearing in the temperature range from -40 • C to +120 • C must be kept, since operation has to remain possible in cold regions as well as in the hot engine compartment [5,6]. References [2,7] reported the occurrence of noise in porous journal bearings when certain types of lubricants are used, but their tests focused on high-temperature operation only.…”