Detection of broken bars in frequency converter fed induction motor using Park´s vector approach

This paper presents the experimental study of induction motor broken rotor bars diagnostics. Fault tests are performed on a machine with 3 broken bars, driven through a frequency converter. Park´s vector approach is used as an analyzing tool to detect the broken rotor bars. Park´s vector patterns in case of stator current and voltage are investigated. Results of the tests and discussion are presented. Necessity for further study is pointed out.