Method for predicting remaining service life of T-shaped tail portion of rotor of pumped-storage power generation motor

Abstract

A method for predicting the remaining service life of the T-shaped tail portion of a rotor of a pumped-storage power generation motor comprises the following steps that (1), an electromagnetic field calculation is carried out, wherein excitation source input, namely electromagnetic force, needed by structure field calculation, is obtained through the electromagnetic field calculation; (2) the structure field calculation is carried out; (3), a corrected S-N curve is drawn; (4) the fatigue life of the T-shaped tail portion of the rotor of the pumped-storage power generation motor is predicted through the corrected S-N curve obtained in the step (3) and calculation results of the step (1) and the step (2), and namely prediction of the remaining service life of the T-shaped tail portion of the rotor of the pumped-storage power generation motor is achieved. According to the method for predicting the remaining service life of the T-shaped tail portion of the rotor of the pumped-storage power generation motor, an accumulation effect, not considered in the field of electrical machinery, of multiple working conditions on fatigue failures and S-N curve correction both are used for evaluating the fatigue life of the T-shaped tail portion of the motor of the pumped-storage power generation motor, and accurate prediction of the fatigue life is achieved.

Description

technical field [0001] The invention relates to the field of prediction of the service life of a rotor of a generator motor, in particular to a method for predicting the remaining service life of the tail part of a rotor T of a pumped storage generator motor. Background technique [0002] Pumped storage power plants have been widely used in power systems as peak-shaving, frequency-regulating, and emergency backup power sources. The operating conditions of the rotor of the generator motor are complex, there are two-way rotation, frequent start and stop, etc., and the speed of the flyaway reaches 725rpm, making it difficult to connect the rotor poles (schematic diagram as shown in figure 1 shown) and the T-tail of the yoke (schematically shown in figure 2 As shown), stress concentration occurs, and fatigue failure may occur under the action of alternating stress, which brings great challenges to the safe and stable operation of the generator motor. [0003] The difficulty i...

AI Technical Summary

Problems solved by technology

The article considers the contribution of electromagnetic and mechanical factors to the stress. In terms of motor operation, it only considers the influence of the start-up process on the fatigue life of components, and does not consider the influence of other working conditions. It is not appropriate to the actual operation of the motor and cannot meet the power generation Fatigue Analysis Requirements for Motor T Tail

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