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转子结构上的动应力是影响结构性能和疲劳寿命的直接因素,进而决定了部件安全运行能力。由于发电电动机存在多种工况间相互切换,其转子需频繁正反转和转速陡增,导致结构承受频繁变化的动应力作用。而常规电机结构评估仅考虑固定转速下结构的静态应力,不足以评估复杂运行工况下发电电动机转子的结构性能。因此,以广州抽水蓄能电站B厂一台已投运机组为例,选取机组典型运行工况,运用瞬态动力学计算各工况下转子结构上的动应力谱,并以此评估转子的结构性能。结果表明,各工况下应力集中发生在磁轭鸽尾槽,并且不同工况下的峰值应力位置出现在鸽尾槽的不同位置,这为提高机组运行可靠性和疲劳寿命提供了理论依据。
Dynamic stress on the rotor structure is the direct factor that affects the structural performance and fatigue life, which in turn determines the safe operation of the components. Due to the alternation of generator operating conditions in a variety of operating conditions, the rotor needs frequent reversal and speed increase, resulting in the structure being subjected to frequent dynamic stress changes. The conventional motor structure evaluation only considers the static stress of the structure at a fixed speed, which is not enough to evaluate the structural performance of the generator rotor under complex operating conditions. Therefore, taking Guangzhou Pumped Storage Power Station Plant B has a commissioning unit as an example, select the typical operating conditions of the unit, the use of transient dynamics to calculate the dynamic stress spectrum of the rotor structure under various conditions, and to evaluate the rotor Structural performance. The results show that the stress concentration occurs in the yoke dovetail groove under various working conditions and the peak stress position appears in different positions of the dovetail groove in different working conditions, which provides a theoretical basis for improving the operational reliability and fatigue life of the unit.