Method for detecting mechanical properties of rotor pigeon tail part of pumped storage power generation motor

Abstract

The invention discloses a method for detecting mechanical properties of a rotor pigeon tail part of a pumped storage power generation motor. The method comprises the steps of: according to rotor speed curves provided by a pumped storage power plant under actual operation conditions, obtaining acceleration distribution as loads, and respectively 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; drawing time-varying stress curves at two points of maximum stresses under different conditions according to motor temperature variations caused by an electromagnetic loss, and calculating the available times of fatigue life of the two points according to the curves; 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, respectively calculating the use period of the accumulative fatigue life at the two points of the rotor pigeon tail part, and carrying out mechanical performance detection. The method provides instructions for a major repair plan of a motor of the pumped storage power plant.

Description

technical field [0001] The invention discloses a method for detecting the mechanical performance of the dove tail of a rotor of a pumped storage power generation motor, and relates to the field of fatigue life prediction of the dove tail of a pumped storage power generation motor. Background technique [0002] The pumped storage generator motor is a large-scale mechanical rotating device that realizes the transformation of mechanical energy into electrical energy and vice versa. During the conversion of working conditions, the contact parts of the rotating parts will bear a large alternating force. The actual operation shows that the fatigue life of this contact part is an important factor that limits the normal service life of the motor, and the mechanical analysis of this part is the basis for using the S-N curve in fatigue to calculate the fatigue life of metal components. The connecting part of the rotor and the magnetic pole usually has a dove tail (named after the str...

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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 the load for fatigue life prediction. This method cannot reflect the change of stress distribution over time, so the traditional method can no longer accurately reflect Its mechanical properties, and the conclusions obtained by traditional method analysis cannot actually guide pumped storage power plants to formulate motor maintenance plans

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