Method for monitoring radial gap between rotor and stator of electric generators and device for carrying out said method

Abstract

The invention relates to a method for monitoring the radial gap (10) between the rotor (6) and the stator (8) of an electric generator (2). The aim of the invention is to provide a method that allows an especially reliable analysis of the shape of the radial gap (10) during operation of the generator (2). To this end, a measuring cycle is carried out in the stationary and balanced operating mode of the generator at defined intervals. In every measuring cycle, current parameters (120) of the radial gap (10) are determined from current marginal values (50) of the generator (2), from current influential values (80) of the generator (2) and from current measuring data (100). These parameters are used to determine and evaluate the shape of the radial gap (10) and the distance between the rotor (6) and the stator (8) by comparing them with reference parameters. The inventive method allows to better predict when repairs have to be made.

Description

technical field [0001] The invention relates to a method for monitoring the radial gap between the motor rotor and the stator. It also relates to a device for implementing the method. Background technique [0002] The radial gap between the generator rotor and the stator has the shape of a concentric annular cylinder. Here, the outer surface is formed by the laminated core of the stator, and the inner surface is formed by the surface of the upper pole of the rotor, which determines the maximum rotor diameter. [0003] The size of the radial gap, which is decisive for the magnetic field or required excitation, is generally small relative to the diameter of the stator inner wall, for example in a generator with a rotor diameter of 16 m it is approximately 0.2% of the stator inner wall diameter. Via the radial gap, a magnetic interaction takes place between the rotor and the stator. In this case, this magnetic force increases the existing static and / or rotational asymmetry, ...

AI Technical Summary

Problems solved by technology

In extreme cases this can cause the rotor to brush against the stator while the generator is operating, with the result being severe damage and prolonged generator downtime

[0009] According to the traditional monitoring method for the radial gap between the generator rotor and the stator, it cannot provide a forecast for the real-time shape of the radial gap during the working process of the generator

The method of monitoring the vibration of the stator laminated core is usually used, but this method can only partially detect the change in the shape of the radial gap between the rotor and the stator

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