Method For Identifying A Fault In An Electrical Machine
AssigneeABB Research Ltd.
InventorPedro Rodriguez
Life of this patent
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Abstract
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.
Claims15
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.
A monitoring system for identifying a fault in an electrical machine having a rotor and a stator, the monitoring system comprising:
- a first sensor arranged to measure vibrations of the stator in a first radial direction of the stator,
- a second sensor arranged to measure vibrations of the stator in a second radial direction of the stator,
- a processor receiving measurement signals from the first sensor and the second sensor, the processor comprising a first algorithm for detecting from the measurement signals a first vibration frequency and a mode shape of the vibration at the first vibration frequency, and the processor further comprising a second algorithm for identifying a fault condition of the electrical machine from the combination of the first vibration frequency and the mode shape.
Dependencies are inferred from the claim text.