Vibration problems of a segment of winding between two clamping plates are studied when the clamping plates, which are used to fix stator end winding, are loose. First, magnetic induction expressions of the winding wh...Vibration problems of a segment of winding between two clamping plates are studied when the clamping plates, which are used to fix stator end winding, are loose. First, magnetic induction expressions of the winding while the generator was running were given by using separation of variables method. Also, the expressions of the winding electromagnetic force and dry friction force between loosing clamping plates were gotten. Secondly, a mechanical model, which was used to study nonlinear vibration problem of the winding,was set up. Fundamental resonance was analyzed by using multiple scales method, and a resonance equation of amplitude and frequency in steady state was given. Then stability, bifurcation and singularity of the steady solution were studied. Criterions of stability and transition set of the bifurcation equation were obtained. At last, through numerical calculations, resonance curves were obtained. The results are helpful for analysis and protection of generator accidents.展开更多
The shrink fit retaining ring is currently the easiest to install and the most widely used end fixed for structure AC excitation variable speed generator-motor rotor end windings.However,the current research on the ef...The shrink fit retaining ring is currently the easiest to install and the most widely used end fixed for structure AC excitation variable speed generator-motor rotor end windings.However,the current research on the effect of high strength sealing on the ventilation and heat dissipation performance of the end is not enough.In this paper,based on the actual structural parameters and periodic symmetry simplification,the three-dimensional coupled calculation model of fluid field and temperature field is established.After solving the fluid and thermal equations,the influence of the length of rotor support block,the height of rotor support block,and the number of rotor support block on the fluid flow and temperature distribution in the rotor end region of generator-motor is studied using the finite volume method.The rheological characteristics of the air in the rotor domain,such as velocity and inter-winding flow,are analyzed.The law of temperature variation with local structure in the computational domain is studied.The variation law of cooling medium performance inside the large variable speed power generator motor is revealed.展开更多
End windings of generators are excited to vibrations due to electromagnetic forces which can cause severe damage and noise. To avoid this, it is important to predict the natural frequencies and modes of the end windin...End windings of generators are excited to vibrations due to electromagnetic forces which can cause severe damage and noise. To avoid this, it is important to predict the natural frequencies and modes of the end windings with finite elements. Due to the complex structure and unknown boundary conditions, the conventionally calculation of stator end windings has been very difficult and time consuming up to now. This paper describes the development of a full parameterized modeling tool, which allows a quick calculation of natural frequencies during the design phase of the generator. To keep the computing time low, it is important to find a way to get exact calculation results without detailed modeling of all pans. Additionally, special attention was paid to the active part, which has been replaced by spring-damper elements, and the determination of their stiffness via experimental modal analysis combined with finite element calculations.展开更多
随着清洁能源的发展,风电作为一种清洁、可再生的能源,具有巨大的发展潜力。然而,风电的开发需要精确的风能资源测量和评估,以及选择适当的风电场址。因此,开发了基于B/S(Browser/Server,浏览器/服务器)端的风电场规划设计平台。该平台...随着清洁能源的发展,风电作为一种清洁、可再生的能源,具有巨大的发展潜力。然而,风电的开发需要精确的风能资源测量和评估,以及选择适当的风电场址。因此,开发了基于B/S(Browser/Server,浏览器/服务器)端的风电场规划设计平台。该平台提供了多种功能,包括项目管理、风能资源评估、风电场选址、中尺度数据处理和方案管理等。该平台利用GIS(Geographic Information System,地理信息系统)技术和模型计算方法,能够对风能资源进行多方面评估和分析,根据地理信息、环境和建设要求等因素,优化风电场选址。同时,该平台具有用户友好的界面和数据交互功能,使得开发者可以更加便捷地实现风电项目开发。实际应用结果表明,该平台在风电场选址、风电资源评估等方面具有较强的竞争力,能够有效促进风电产业的发展。展开更多
文摘Vibration problems of a segment of winding between two clamping plates are studied when the clamping plates, which are used to fix stator end winding, are loose. First, magnetic induction expressions of the winding while the generator was running were given by using separation of variables method. Also, the expressions of the winding electromagnetic force and dry friction force between loosing clamping plates were gotten. Secondly, a mechanical model, which was used to study nonlinear vibration problem of the winding,was set up. Fundamental resonance was analyzed by using multiple scales method, and a resonance equation of amplitude and frequency in steady state was given. Then stability, bifurcation and singularity of the steady solution were studied. Criterions of stability and transition set of the bifurcation equation were obtained. At last, through numerical calculations, resonance curves were obtained. The results are helpful for analysis and protection of generator accidents.
基金This research was funded by Dongfang Electric Machinery Co., Ltd.
文摘The shrink fit retaining ring is currently the easiest to install and the most widely used end fixed for structure AC excitation variable speed generator-motor rotor end windings.However,the current research on the effect of high strength sealing on the ventilation and heat dissipation performance of the end is not enough.In this paper,based on the actual structural parameters and periodic symmetry simplification,the three-dimensional coupled calculation model of fluid field and temperature field is established.After solving the fluid and thermal equations,the influence of the length of rotor support block,the height of rotor support block,and the number of rotor support block on the fluid flow and temperature distribution in the rotor end region of generator-motor is studied using the finite volume method.The rheological characteristics of the air in the rotor domain,such as velocity and inter-winding flow,are analyzed.The law of temperature variation with local structure in the computational domain is studied.The variation law of cooling medium performance inside the large variable speed power generator motor is revealed.
文摘End windings of generators are excited to vibrations due to electromagnetic forces which can cause severe damage and noise. To avoid this, it is important to predict the natural frequencies and modes of the end windings with finite elements. Due to the complex structure and unknown boundary conditions, the conventionally calculation of stator end windings has been very difficult and time consuming up to now. This paper describes the development of a full parameterized modeling tool, which allows a quick calculation of natural frequencies during the design phase of the generator. To keep the computing time low, it is important to find a way to get exact calculation results without detailed modeling of all pans. Additionally, special attention was paid to the active part, which has been replaced by spring-damper elements, and the determination of their stiffness via experimental modal analysis combined with finite element calculations.
文摘随着清洁能源的发展,风电作为一种清洁、可再生的能源,具有巨大的发展潜力。然而,风电的开发需要精确的风能资源测量和评估,以及选择适当的风电场址。因此,开发了基于B/S(Browser/Server,浏览器/服务器)端的风电场规划设计平台。该平台提供了多种功能,包括项目管理、风能资源评估、风电场选址、中尺度数据处理和方案管理等。该平台利用GIS(Geographic Information System,地理信息系统)技术和模型计算方法,能够对风能资源进行多方面评估和分析,根据地理信息、环境和建设要求等因素,优化风电场选址。同时,该平台具有用户友好的界面和数据交互功能,使得开发者可以更加便捷地实现风电项目开发。实际应用结果表明,该平台在风电场选址、风电资源评估等方面具有较强的竞争力,能够有效促进风电产业的发展。
