50MW补偿脉冲发电机的设计与优化

为深化补偿脉冲发电机有关机理、工艺和外围系统配合的研究,研制了一台额定转速为8000r/min的50MW全被动补偿脉冲发电机,并介绍了其中关键材料包括屏蔽筒和转轴等的选择。在理论计算和仿真分析的基础上设计了电机励磁回路以及电枢绕组,提出了一种新的电枢绕组端部屏蔽方法即采用内外两个铝环紧固绕组端部,在实现端部屏蔽的基础上还增加了端部强度,在比较了两种不同屏蔽措施的基础上提出了端部漏感的简化计算方式,并通过理论分析和仿真验证了端部屏蔽可以进一步减小电枢绕组的放电电感。最后通过分别计算补偿电机直线部分的电感和端部漏感,比较了不同设计参数下补偿电机内电感,对电枢绕组进行了优化设计,提高了补偿电机峰值功率密度。理论分析和仿真证明了所设计电机的参数及其运行可靠性可以达到设计要求。

Design and Optimization of a 50MW Compulsator

In this paper,an iron-core passive all-compensated compulsator with peak power of 50MW and rotational speed of 8000 rpm is designed.The selections of the key materials such as the shield and the shaft are put forward through mechanical and dynamics calculation and simulation.By analyzing the working conditions of this compulsator,the separately excitation mode is selected to simplify the system.In traditional compulsators,most measures are focused on how to decrease the discharging inductance of the armature iron part.Actually the leakage of the end turns will influence the total discharge inductance in an iron-core compulsator.Another problem in compulsator structure design is how to fix the end-turns because the large current will lead to very large EM force.To decrease the total discharge inductance and increase the peak discharging current,a new method of using aluminum hoops to achieve the end turns shielding is put forward to minimize the end turns leakage as well as the aluminum hoops can also increase the capability of the end turns on resisting the EM force during discharge.Two shielding measures are compared from the viewpoint of fabrication techniques.This paper also presents a simple method for estimating the leakage of shielding end turns.Optimizations of the armature design are discussed by calculating the inductor of the iron part and the end turns part respectively,so the peak power density can be increased by about 15%.According theory analysis and Ansys FEM simulation,this design parameter can satisfy the primary requirements of the compulsator and its safe run.