Fault classification for rolling element bearing in electric machines

AbstractMachines never break down by chance. Their operating condition gradually deteriorates and this gradual quantitative deterioration transforms into a failure, manifesting a qualitative change. When a fault takes place, some of the machine parameters are subjected to change. The change in the machine parameter depends on the degree of faults and the interaction with other parameters. In most cases, more than one parameter is subjected to change under abnormal conditions. If these machine parameters can be measured, they give information relating to a developing fault and then maintenance can be planned for the next available shutdown. Therefore, condition monitoring requires measurement to be taken from the machine on a continuous basis and is used to indicate the current working condition of that machine. There are a number of parameters that can be considered for monitoring the machine. For induction machines, monitoring parameters are terminal voltages, line currents, stack temperature of stator, ...