Real-time tracking of the torsional vibration of an induction motor supplied by distorted voltage sources

Wang, Yen-Nien; Gu, Jyh‐Cherng; Chen, Chih‐Ming

doi:10.1016/s0378-7796(01)00088-8

Cited by 6 publications

(1 citation statement)

References 11 publications

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“…Besides the obvious case of reciprocating engines or crank-balance beam mechanisms, there are other notable examples of machines and mechanisms that also originate torsional vibration, such as couplings by means of a universal cardan joint [2], gear transmissions [3][4][5], reducers of cycloidal cams, electric motors [6], pumps, compressors and fans [7]. Moreover, certain defects in the dynamics of rotation, in the load conditions or in the coupling between the rotating machines, can cause torsional vibrations in their shafts [8].…”

Section: Introductionmentioning

confidence: 99%

Discrete time interval measurement system: fundamentals, resolution and errors in the measurement of angular vibrations

León

Pérez

2010

Meas. Sci. Technol.

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The traditional method for measuring the velocity and the angular vibration in the shaft of rotating machines using incremental encoders is based on counting the pulses at given time intervals. This method is generically called the time interval measurement system (TIMS). A variant of this method that we have developed in this work consists of measuring the corresponding time of each pulse from the encoder and sampling the signal by means of an A/D converter as if it were an analog signal, that is to say, in discrete time. For this reason, we have denominated this method as the discrete time interval measurement system (DTIMS). This measurement system provides a substantial improvement in the precision and frequency resolution compared with the traditional method of counting pulses. In addition, this method permits modification of the width of some pulses in order to obtain a mark-phase on every lap. This paper explains the theoretical fundamentals of the DTIMS and its application for measuring the angular vibrations of rotating machines. It also displays the required relationship between the sampling rate of the signal, the number of pulses of the encoder and the rotating velocity in order to obtain the required resolution and to delimit the methodological errors in the measurement.

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