Current-based sensorless vibration monitoring of small synchronous machines

This paper presents an initial study into the relationship between mechanical vibrations and their effect on the airgap and the resultant stator and field current harmonics in low and medium voltage synchronous machines. Experimental results show that the modulation of the airgap by mechanical vibrations can be detected in the stator and field current spectra and are monotonically related for a given vibration/current harmonic set. This paper presents experimental results for a 4 kW, 240 V, 4 pole wound-field synchronous motor tested at two different load conditions for five levels of rotor imbalance.

[1]  H.A. Toliyat,et al.  Simulation and detection of dynamic air-gap eccentricity in salient pole synchronous machines , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[2]  P.S. Hamer,et al.  API Standard 546-a new purchase specification for large synchronous motors and generators , 1990, 37th Annual Conference on Petroleum and Chemical Industry.

[3]  Gerald Burt Kliman,et al.  Methods of Motor Current Signature Analysis , 1992 .

[4]  J. Penman,et al.  The detection of stator and rotor winding short circuits in synchronous generators by analysing excitation current harmonics , 1996 .

[5]  T. G. Habetler,et al.  A method for sensorless on-line vibration monitoring of induction machines , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[6]  Peter Tavner,et al.  Condition monitoring of electrical machines , 1987 .

[7]  Thomas G. Habetler,et al.  Effects of time-varying loads on rotor fault detection in induction machines , 1993 .