I. Introduction
Bearings are essential mechanical elements in transferring rotational movements. In rotating electrical machines, they are fundamental for the movement of the rotor. The bearings used in electrical machines are relatively inexpensive, but faults in these elements can cause the interruption of a production line, causing material and financial losses [1], [2]. Bearings are the leading cause of failures in electric machines, approximately 44% [3]. Because of the importance of induction motors (IMs) in the industrial environment, the prior diagnosis of bearing failures is essential to maintain the integrity of the machine and the operating system. Therefore, to have a reliable and safe system, it is necessary to monitor and diagnose the bearing faults continuously [4]. As important as diagnosing and characterizing the fault is to estimate its severity [5].