Condition Monitoring and Life extension of Induction Motor

Abstract

Squirrel Cage Induction Motors are the most commonly used drives in industrial applications to drive majority of the production related Pumps and Compressors. Also their utilization is getting with the development of variable frequency drives for speed control. More than 50% of the world generated electrical energy is being consumed by these induction motors while driving their connected loads. They are more reliable, high efficient, rugged and simple in construction. Their cost is less when compared with others. Even though their designed shelf life is around 25 years, with proper Condition Monitoring, the breakdowns can be minimized and also their life can be extended. An attempt has been made in this paper to discuss about various faults associated with three phase Squirrel cage Induction Motor of LT category, different diagnosis methods applicable to them and the possible maintenance practices to enhance their life.  One known case study is taken for analysis with its test details.