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Date of Publication:2010-01-01

Journal:振动与冲击

Issue:8

Page Number:169-173

ISSN No.:1000-3835

Abstract:The unbalance magnetic pull on the rotor of an eccentric water turbine generator set has important influence on its vibration. The magnetic stiffness matrix was introduced to express the energy of the magnetic field in air gap. Two vibration models were constructed, making use of lagrange equation. The difference between the two models lies in the boundary supporting conditions: one is rigidly supported and the other is with elastic bearing supports. The influences of magnetic stiffness and elastic supports on the critical speed of rotor were studied using Liapunov nonlinear vibration theory. The vibration amplitude of the rotor was calculated, taking the magnetic stiffness and eccentrical force into account. The sensitivities of the magnetic, mechanical and bearing parameters with respect to the critical speed were analyzed. Some conclusions may be benefit to the study of dynamic characters of the generator set shaft system which concludes all the magnetic, mechanical and hydraulic parameters.

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