Method for predicting accumulative fatigue life of rotor pigeon tail part of pumped storage power generation motor based on Miner rule

Abstract

The invention discloses a method for predicting accumulative fatigue life of a rotor pigeon tail part of a pumped storage power generation motor based on a Miner rule. The method comprises the steps of: according to rotor speed curves provided by a pumped storage power plant under different actual operation conditions, obtaining acceleration distribution as loads, and obtaining the time-varying stress distribution situations caused by centrifugal forces of the rotor pigeon tail part of a power generation motor under a power generation starting condition, a power generation shutdown condition, an electric starting condition, an electric shutdown condition, a load shedding condition and a runaway speed operating condition; carrying out vector summation on motor temperature variations caused by an electromagnetic loss and stress distributions caused by the generated thermal stress and the centrifugal forces to obtain total stress distributions; and introducing the actual number of occurrence of various conditions of a power generation motor which has been run for m years and the number of use of the fatigue life of the power generation motor under various conditions into a Miner rule calculation formula, and calculating and obtaining the use period of the fatigue life of the rotor pigeon tail part of the power generation motor according to a life prediction coefficient and the actual running years m.

Description

Technical field [0001] The invention provides a method for predicting the cumulative fatigue life of the pigeon tail of a pumped-storage generator motor rotor based on the Miner criterion, and relates to the field of predicting the fatigue life of the pigeon tail of a pumped-storage generator motor rotor. Background technique [0002] Pumped-storage generator motors have two main operating conditions: power generation and electric power. They have high speed, large single unit capacity, frequent start and stop of the unit, positive and reverse rotation of the rotor, complex operating conditions, and a more operating environment than ordinary hydro-generators. Bad, and at the same time, with the increase in the operating life of the pumped-storage power station, the failures and accidents of the generator motor are frequent, and the safety and stability problems are becoming increasingly prominent. [0003] At present, there are few studies on the prediction of the fatigue life of t...

AI Technical Summary

Problems solved by technology

The existing research method is to obtain the maximum stress distribution of each working condition through static calculation, and then use it as a load for fatigue life prediction. This method cannot reflect the change of stress distribution over time.

In addition, there is no research on the fatigue life prediction of the pumped storage generator motor rotor dove tail by calculation criteria

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