This chapter shows the common structure present in electrical machines regard less of their size. The construction of electrical machines has also been demonstrated with an indication of the effect of operational service on failure modes. The importance of the insulation system of the machine has also been considered and discussed. Finally, typical failures in service have been shown to identify the most common failure modes that an engineer will encounter, starting with those originating in the insulation system but then expanding to consider other sources. The failure modes demonstrate how faults may be detected in their early stages by monitoring appropriate parameters. In the next chapter we will describe reliability analysis. which will connect root causes to failure modes and shows how condition monitoring can be directed to address particular components in the electrical machine.

Inspec keywords: reliability; electric machines; failure analysis; machine insulation

Other keywords: electrical machine failure mode; operational service; fault detection; root cause; electrical machine operation; parameter monitoring; condition monitoring; electrical machine construction; machine insulation system; reliability analysis

Subjects: a.c. machines