Fig. 3From: Air gap eccentric analysis and fault detection of traction motorChange curve of the center frequency: a \(K{ = 2}\), \(\alpha { = }2000\); b \(K{ = 3}\), \(\alpha { = }2000\); c \(K{ = 4}\), \(\alpha { = }2000\); d \(K{ = 5}\), \(\alpha { = }2000\)Back to article page