Method for identifying a fault in an electrical machine

摘要

For identifying a fault in an electrical machine vibration is measured in a plurality of radial directions of the stator. On the basis of the vibration measurements a vibration frequency and a mode shape of the vibration at this frequency is determined. Characteristics of the vibration in terms of both the vibration frequency and the mode shape are used to identify a fault condition of the electrical machine.

主权项

1. A method for identifying a fault in an electrical machine having a rotor and a stator, the method comprising the steps of:
carrying out a first vibration measurement on vibrations of the stator in a first radial direction of the stator; carrying out a second vibration measurement on vibrations of the stator in a second radial direction of the stator; determining, on the basis of at least one of the first vibration measurement and the second vibration measurement, a first vibration frequency; determining, on the basis of the first vibration measurement and the second vibration measurement, a mode shape of the vibration at the first vibration frequency; and using a combination of the first vibration frequency and the mode shape to identify a fault condition of the electrical machine.