为使汽轮发电机轴流风扇产生的气动摩擦损耗不直接引入到电机内部,研制了大容量350MW抽风式空冷汽轮发电机.基于该电机在试验条件下轴流风扇安装角为29.2°的运行数据,开展CFD仿真计算,研究扇叶的安装角(29.2°、31.2°)和叶片数对静压效率、压升、温升等风扇性能参数的影响.通过数据分析发现,在保证风扇数目足够的情况下,电机风量较大时,可采用风扇安装角度31.2°,同时适当提高空冷器冷却能力;在电机风量较少时,建议采用风扇安装角29.2°.

以某汽轮发电机导电杆为研究对象,分别采用热网络法、有限元法和电-热耦合计算的方法,对其温升情况进行研究.文中最后采用电-热耦合的方法,无需给定损耗源的大小,而是通过设置流入导体的电流值,采用耦合计算的方法对导电杆温升进行计算,减小了损耗计算方法带来的误差.更为准确的通过比较三种方法的各自特点,指出了电-热耦合法的优点,得出耦合法是今后的发展趋势.

核电站海水循环水泵电机铁心负责为磁通的建立提供路径,铁心设计需要考虑磁通密度、热负荷、通风等因素,在确保各铁心不发生磁饱和的情况下,铁心设计温升应低于限定值.介绍了铁心磁路计算、通风计算和铁心研制,并对定子铁心开展了铁损试验,为核电站大型循泵电机铁心设计、制造及试验积累了经验.

大型水轮发电机长期在电、热、机械和环境因素的作用下运行,会经历磨损和劣化.我国许多机组已超期服役,存在着大量的隐患,如果不进行改造,将严重威胁到发电机甚至整个电网的安全.本文以国内某电厂一台运行了43年的发电机为例,详细分析了定子存在的问题,对一些参数和变量进行了分析计算,论证了定子改造的可行性,并提出了改造的方案.对类似电厂的改造具有重要参考价值.

This paper presents the features of ventilation system,cooling method and the choice of heating parameters of Xiluodu hydro generator.The air flow rate of the ventilation system is calculated with network method,and the temperature distribution in each part is calculated with finite element method.By analyzing the results,the baffle is installed to improve the distribution of air flow rate,which put forward the optimization of the local flow field.In addition,the influence of ventilation system structure on the ventilation cooling effect is discussed.The results show that the test data and the calculation results is very close to each other,the improving method is benefit to the cooling effect.

Large motor/generator usually has the characteristic of high single pole capacity, large thermal parameters, to solve the contradiction of electromagnetic heat loss and ventilation cooling,reasonable cooling structure of the rotor is extremely important to enhance the cooling effect and make the electromagnetic parameters better. In this paper, a series of field coils with different cooling structures are introduced, it is described that the fluid and thermal simulation test is the effective method to confirm the cooling effect of large motor/generator. Combining the calculation and analysis results of different rotor cooling structures, the comparison tests of different cooling structure field coils are executed, and the cooling effect impacted by the cooling structure in the same loss condition is acquired. By the thermal model simulation test,advanced high effective cooling structure is developed, which implements the technology breakthrough and independent innovation.

In this paper,various cooling methods test of Shenzhen motor/generator were demonstrated using the similarity simulation test.The cooling effects of different ventilation structures were analyzed by data comparison,and then a reasonable cooling method was selected for Shenzhen motor/generator.Additional,based on the simulation test,the fluid field feature was acquired,which provides the boundary condition for temperature calculation.Using the finite element calculation method,the temperature distribution of Shenzhen motor/generator is studied,by which the cooling effect of the motor/generator is expected.

The text talks about the features of ventilation system, cooling method and the choice of fever parameters of the Xiangjiaba Hydro Generator. It also introduces the calculation method of air flow and temperature distribution in each part and discusses the influence of ventilation system structure on the ventilation cooling effect .By comparing the test data and the calculation results, we check out the accuracy of the calculation and put forward the optimization measures on the local flow field.

以1500MW核电半速大型发电机的转子通风系统为例,通过对副槽多段轴径向通风结构进行设计,并利用所需风量小的优势,提出了;种针对副槽多段轴径向通风结构的转子温升计算方法.

In this paper,the ventilation and temperature rise of a 20MW turbine generator rotor are researched through the procedure introduced from abroad and software FLOWMASTER,then the results of air flow and temperature distributions are acquired.Based on the calculation results,the rotor structure is optimized and enable the temperature rise of rotor to meet the requirements of technical indicators.

The calculation of temperature rise is one of the main content in designing hydrogenerator.It relates directly to the performance indexes of motor such as output and efficiency,and influences operation life and reliability of the motor.An accurate temperature-rise calculation is not only an aim for all manufacturers,but also one of the important issues for motor operation departments.Thus,it is very necessary to research an accurate and feasible method for temperature-rise calculation.In this paper,Xiangjiaba large hydrogenerator is taken as an example to respectively calculate stator temperature rises by network method and temperature field method.The results basically agree with each other.

在现代生产中电动泵应用十分广泛,本研究对一台电动泵电机的通风系统进行研究,通过计算分析找出了通风系统存在的问题,针对问题进行通风系统结构改进,并对定子温度进行计算,检验了通风系统改进的效果。

It is disadvantageous for bulb tubular hydrogenerators ventilation and cooling that the diameters are smaller than those of common generators. So the ventilation mode is the key-technology in the design of bulb tubular hydrogenerators. In this paper the structure of ventilation system, the type of coolers and the working spot of fan are fixed on for bulb tubular hydrogenerator by computing and analysing, the design ensures that the temperature rise is in allowable confine.

Ventilation system of 150MW air cooled turbogenerator was computed and analyzed in detail in this paper.Thermal network method was used to create the networks and calculate temperature rise of stator and rotor.The ventilation test on the turbogenerator was performed,including air flow rate,fan efficiency,pressure and so on.The results were quite close to the calculated values.The ventilation system and coolers can meet the requirements of the endurance,security and reliablity of the electric machine operation.

In this paper,the characteristics of ventilation system and the fluid state of the air flow of 700MW hydrogenerator are simulated by means of studying similitude ventilation model,which is useful for varifying the feasibility of the ventilation system design and improving the structure of ventilation system.