Motor Speed Measurement Method Based on Vibration Signals and Synchrosqueezing Wavelet Transform and Experimental Analysis
To address the issue of some motors in industrial sites being unable to be equipped with speed sensors,this study proposes a motor speed measurement method based on vibration signals and synchrosqueezed wavelet transform.Initially,the motor vibration signal is subjected to Hilbert transform to obtain the envelope signal,demodulating the vibration component directly related to speed.Then,the synchrosqueezed wavelet transform is employed to analyze and compute the time-frequency map of the envelope signal.Finally,the cost function method is improved by introducing the interquartile range and variance of the ridge line,and this modified method is used to extract the time-frequency ridge line of the fundamental frequency vibration component from the time-frequency map,thereby obtaining the motor's speed curve to achieve speed measurement without a tachometer.Through simulation and experimental validation,the proposed method can accurately detect motor speed under both steady and non-steady conditions,and the error does not exceed 5%.The research and practice process of this method can deepen students'understanding of the theoretical knowledge of modulation and demodulation,time-frequency analysis,etc.,and improve their ability to link theory with practice.
tacho-less speed measurementHilbert transformsynchrosqueezing wavelet transformvibration signalexperimental design and analysis
万方数据
维普
