INVESTIGATION ON ELECTROMAGNETIC FORCES AND EXPERIMENTAL VIBRATION CHARACTERISTICS OF STATOR END WINDINGS IN GENERATOR

This paper investigates the electromagnetic forces acting on the stator end windings, by using the stator end windings structure of a 600 MW large-capacity turbo-generator as the analysis object. Firstly, based on the method of images, the Biot-Savart Law and superposition theorem, the calculation model of the stator end windings is proposed. Then, the average electromagnetic forces acted on the end windings and the relationship between radial and tangential electromagnetic force densities are analyzed. The result shows that the tangential electromagnetic force should be treated as radial one and should not be ignored. Finally, the radial and tangential vibrations are measured to verify the theoretical analysis. The investigation results will be beneficial to the binding and fault diagnosis of stator end windings.