Journal of the Faculty of Engineering and Architecture of Gazi University, cilt.22, sa.2, ss.363-374, 2007 (Scopus)
Starter motors are serial wound dc motors work under heavy duty. Starter motors are used to run the internal combustion engine (ICE). Internal combustion engines can not be run when starter motor is defective. The values of current drawn by starter motor and the voltage across the starter motor vary depending on time. In the analysis of time dependent signals (unstable signals), Wavelet Analysis (WA) is used. In this study, the current and the voltage signals of starter motors are measured by using a measurement rig and current signals of a starter motor is decomposed to its components with the help of Wavelet Analysis. With the use of coefficients derived from the decomposition, defects observed in starter motors and starter system is classified using fuzzy logic. A graphical user interface (GUI) software has been developed by using MATLAB for fault diagnosis. By using this developed fault diagnosis system, six defects seen in starter motors frequently have been diagnosed successfully.