Early Detection of Excessive Coil Vibration in High-Voltage Rotating Electric Machines

A safe and effective method of measuring stator end-winding vibrations of rotating electrical machinery and a vibration monitor are described. The method adopted is to measure electromagnetic vibration of the end-winding generating high voltage during operation. Measurements are obtained by piezoelectric pickups attached to end-winding surfaces. This method is often applied to measure vibration at other points, but it is difficult to effectively and safely measure end-winding vibration in the presence of high voltage and large current.