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Misalignment detection on linear feed axis with FFT and statistical analysis using motor current

Demetgül Mustafa, Gu Minjie, Hillenbrand Jonas, Zhao Yicheng, Gönnheimer Philipp, Fleischer Jürgen

Journal of Machine Engineering

2022

Vol. 22, No. 2

31--42

The linear feed axes are critical subsystems in many production machines and have important responsibilities such as transporting workpieces and tools in the process. Therefore, the component’s working condition is crucial for the production of high-quality products. Because these systems gradually deteriorate, it is necessary to detect these changes and occurring faults with condition monitoring systems. In this study, the motor current of feed axes is monitored for axis misalignment that occurs during or after assembly. We conduct diagnosis with Fast Fourier Transform (FFT) and statistical methods in order to differentiate different misalignment scenarios and operating constraints of the feed axis. Different states are achieved by simulating left and right axis misalignment and operating the table at different speeds and strokes.