Development of a Test Bed for Examination of an Induction Motor with Broken Rotor Bars

Examining a failed induction motor is a complex problem. It is very important to monitor induction motor faults such as broken rotor bar or end ring fault under the laboratory conditions. Since such faults do not frequently occur, they have to be created by the researcher himself or herself. Induction motor rotor bar faults are generally created by drilling holes to the rotor bars or to the end rings. Transient analyses are carried out both for the faulted and healthy conditions. In this study, an experimental test bed was developed to examine the experienced broken rotor bar faults for induction motors.  By using the developed test bed, all possible combinations of broken rotor bar faults can be created. This test bed can successfully be used to model different fault types. In the case of broken rotor bar faults, extensive examination of motor behaviors for training purposes will also be possible. Also for faulted and healthy conditions by performing no-load and blocked rotor test experiments the changes in equivalent circuit parameters have been investigated. Moreover the importance of transition resistance and its effects on motor performance has been emphasized