Modern Diagnostics Techniques for Electrical Machines, Power Electronics, and Drives

Rotor faults have been under focus mainly for squirrel-cage IMs with convenient signal processing techniques to tackle the fact that many faults cannot be detected easily when the machine load is light. The second largest part dealing with the IM fault detection is related to stator winding, including the insulation degradation and further early stage short circuits. It has been shown that the insulation degradation detection is the best way to prevent short circuits, but it is the most difficult to be implemented online. The same approach has been presented for permanent magnet synchronous machines (PMSMs) or even synchronous generators (SGs) but with a shorter description since the main features of the IMs fault detection can be applied in the same way for PMSMs. However, the detection of demagnetization has been added as an important point specific to these machines. As in the case of IMs, a brief analysis of the ongoing research in the field of multiphase PMSMs has also been developed.