The primary goal of this investigation is to determine whether or not alternator electrical signals such as the phase output voltage or rotor excitation voltage and current can be considered indicators of alternator acoustics problems related to the magnetic performance of the alternators. In addition we have used ESA (Electrical Signature Analysis) to study the internal magnetic perfomance of the alternator in order to evaluate manufacturing quality and the operating condition of the unit. Analyses in this study were conducted in several steps. The first and most obvious step was to perform a quick study of alternator acoustic behavior using the recorded sound data from two alternators. Based on these results, a comparison of various alternator phase output voltage signals as initiated, using signal conditioning techniqes on the phase output voltage. Other parameters, such as rotor excitation current and rotor excitation voltage, were also reviewed. Throughout the investigation, time domain and spectral analysis techniques were used, with the most interesting results arising in the time domain. This study opens the door to analyis of many aspects of alternators and would be easily extrapolated to generators and similar devices such as electric clutches and brakes. Significant impact can be realized in the area of manufacturing quality as well as diagnostics and prognostics of operating units and units in repair shops.
Electrical signature analysis for automotive alternator diagnostics
Sound and Vibration ; 32 , 2 ; 20-25
1998
6 Seiten, 13 Bilder
Article (Journal)
English
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