【作者】 方勇；

【导师】 鲍晓华；

【作者基本信息】 合肥工业大学 ， 电气工程（专业学位）， 2015， 硕士

【摘要】 近年来,潜水电机在农业灌溉、原油开采、抢险防涝等重要场合中受到了越来越广泛的关注,随着国民经济的发展和市场需求的刺激,我国已经研制出世界上最大功率的4000kW潜水电机。大功率潜水电机有两个重要的特点,一是采用闭口槽定子冲片,二是采用多平面端部绕组。由于潜水电机的独特运行环境,采用闭口槽潜水电机可很大程度地削弱水摩擦损耗,而采用多平面端部绕组可有效降低端部绕组温升。由于闭口槽潜水电机的槽磁桥处高度磁饱和,卡特系数不再是1,因此寻求有效的计算闭口槽潜水电机的卡特系数的方法意义重大。潜水电机的定子绕组在稳态运行过程中受到交变电磁力作用发生振动,由于潜水电机向高功率方向发展,定子端部绕组所受电磁力越来越大,长时间运行可能导致绝缘层磨损和疲劳,甚至会引发停机。因此,研究大功率闭口槽潜水电机端部绕组电磁振动,对于潜水电机的设计及优化具有很重要的理论指导意义,且具备一定的工程实用价值。本文结合闭口槽潜水电机槽磁桥处高度磁饱和的特点,提出磁导等效法和几何等效法用以计算闭口槽电机的卡特系数,并与有限元法计算结果进行比较。磁导等效法可考虑槽磁桥处的磁饱和特性,几何等效法适用于工程中快速计算卡特系数。基于槽磁桥处高度磁饱和的特点,计算分析了不同槽型电机起动过程中槽漏抗及转子空载表面损耗。建立闭口槽潜水电机的三维端部模型,采用时步有限元和时谐有限元法求解端部漏磁场。分别采用改进解析法和有限元法计算了闭口槽潜水电机的端部绕组漏感,采用有限元法分析了闭口槽潜水电机端部涡流损耗并提出削弱措施,进一步研究了闭口槽潜水电机端部磁-热耦合问题。最后,采用三维有限元法对2800kW, 10kV闭口槽潜水电机进行了稳态运行和起动过程中的端部绕组电磁力分布研究,基于此,分析了端部绕组的应力分布及变形,并对端部绕组进行了模态分析和谐响应分析。所得结论,可为解决实际工程问题提供一定的参考,并为潜水电机端部绕组结构优化设计和提高电机运行可靠性等方面提供指导意义。更多还原

【Abstract】 Recently, the application of submersible motor in agricultural irrigation, oil extraction, rescue and relief and other important cases is becoming more and more common. With the development of national economy and the stimulation of market demand, our country has developed the maximum power of 4000 kW submersible motors in the world. High-power submersible motor has two important features. One feature is to adopt the closed-slot stator lamination, and the second is to adopt multiple-plane end windings. Due to the unique operating environment of submersible motor, the closed slot submersible motor can greatly weaken the water frictional loss, and multiple-plane end winding can effectively reduce the end winding temperature rise. Since the magnetic saturation located in the slot bridge of closed slot submersible motor, Carter Factor is no longer equal to 1. Hence, to seek effective computing method of closed slot Carter Factor of submersible motor is of great significance. In the steady state running process, the stator end winding of submersible motor is easily to suffer alternating electromagnetic force and vibration. Since the submersible motor develops in the direction of high power, the electromagnetic force of stator end windings is more and more large, and the long-term running can cause insulation abrasion and fatigue, and even cause motor failure. Therefore, research on electromagnetic vibration of high power closed slot submersible motor is of great theoretical guiding significance for design and optimization of the submersible motor, and has some practical value in engineering.Based on the characteristics of high magnetic saturation in closed slot submersible motor, the equivalent permeance method and the geometry method were proposed for the Carter Factor calculation of closed slot submersible motor. And the calculation results were compared to the results obtained by finite element method. The equivalent permeance method can take the high magnetic saturation into consideration and the geometry method is suitable for fast calculation of Carter Factor in the engineering. Based on the characteristics of high magnetic saturation in slot bridges, analysis of slot leakage reactance of the different-slot-type motor during starting process and the rotor surface losses duiring no load condition were performed.The three-dimensional end region model of submersible motor was establised, and the time-stepping finite element method as well as the time-harmonic finite element method was adopted to solve the harmonic leakage magnetic field of end region. Then the improved analytical method and the finite element method were used to calculate the end winding lekage inductance of the closed slot submersible motor. The eddy current losses in end region of closed slot submersible motor were analyzed and the solutions of weakening the eddy current losses were proposed. Moreover, the coupled magnetic-thermal fields in end region of closed slot submersible motor were studied. Finally, the three dimensional model of 2800kW, lOkV submersible motor was constructed for analyzing the electromagnetic forces of the end windings during starting transient operation and steady state running process. Based on this, the stress distributions and the deformations of the end windings were analyzed and the modal analysis and the harmonic response analysis were performed. Furtermore, the conclusions can provide good reference in solving the actual engineering problem and in optimal design of end winding as well as the operational reliability of submersible motor.更多还原