Zastosowanie analizy sygnałów akustycznych do wykrywania uszkodzeń wirników i łożysk w silnikach indukcyjnych

It is known that electrical and mechanical failures appearing in the induction motor cause increased vibration emission of the machine. This phenomenon is commonly used to identify condition of the motor using diagnostic devices equipped with accelerometers. It can be noted that vibration phenomenon is often accompanied by increased noise in the faulty motor, which can be used as a symptom of failure. Contrary to the vibration signals, measurement of acoustic signals does not require installing any sensors in the machine and can be performed non-invasively from a distance. This paper presents the possibility of using the analysis of acoustic signal emitted by the working motor for detection of bearings failures and broken rotor bars. Also the construction details of designed acoustic analyzer, which was utilized in experimental research were presented.