Slip estimation of a large induction machine based on MCSA

This paper presents a newly developed algorithm for a large induction machine rotor slip estimation. The proposed algorithm is based on spectrum analysis of the stator current. The main idea is to find the best fit of spectrum components to the operating parameters. Motor slip is the result of the presented algorithm. Numerical calculations show that the method yields very accurate results and can be an important part of machine monitoring systems. Specially the presented method successfully deals with the slip estimation of a large machine with relatively small slip, for which very often standards methods may fail.