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Design and Development of Test Rig for High Speed Alternator

机译:高速交流发电机试验台的设计与开发

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摘要

This report briefly presents the design and development aspects of the test rig to evaluateudthe performance of high speed alternators with power rating of 5 kW at rated speed of 55000 rpm.udMajor part of the report covers detailed mechanical design of the drive turbine and the other rigudsystems. The test rig is designed and developed at Propulsion Division, NAL-CSIR to map the electricaludcharacteristics of the AC alternator to be used in a Small Turbo Fan Engine (STFE) which is beinguddeveloped by Gas Turbine Research Establishment. An air turbine drive was designed to develop 20 kWudpower at 53000 rpm to drive the alternator. A parabolic solid disc configuration is arrived at to keep theudstress minimum. Cyclic symmetry stress analysis is carried out on the sector model (1/27th) carved outudfrom the blisk. The air turbine shaft is designed to be inserted in to the bore of the alternator hallowudshaft and is to be fastened at the other end with a lock nut. The rotor-dynamic analysis is carried out forudthe rotor in overhang configuration with bearing support stiffness ranging from 17.5 to 175 MN/m andudcritical speeds of the rotor-bearing system is predicted. A lubrication system with an in-built reservoirudtank is designed to provide cooling to the stator core and to lubricate the alternator bearings. Special fixtures are designed to insert and extract the air-turbine shaft into and from the alternator rotor respectively to ensure that the alternator bearings are not unduly loaded during assembly and dis-assembly procedures. The rig is instrumented with pressure, temperature and flow transducers for compressed air and the lubrication oil in addition to speed and vibration pick-ups. As the rotationaludspeed of the rig is extremely high, several safety measures are considered and implemented.
机译:本报告简要介绍了试验台架的设计和开发方面,用于评估额定功率为55000 rpm时额定功率为5 kW的高速交流发电机的性能。 ud报告的主要部分涵盖了驱动涡轮和驱动器的详细机械设计。其他装备 udsystems。该试验台是由NAL-CSIR推进部门设计和开发的,用于绘制将用于燃气涡轮研究机构正在开发的小型涡轮风扇发动机(STFE)的交流发电机的电气特征。空气涡轮机驱动器设计为以53000 rpm的转速产生20 kW udpower的功率,以驱动交流发电机。达到抛物线固态磁盘配置以使 udstress最小。从翼片上雕刻 ud的扇形模型(1 / 27th)进行循环对称应力分析。空气涡轮机轴设计为插入交流发电机空心轴的孔中,并在另一端用防松螺母固定。对悬垂结构的转子进行了转子动力学分析,轴承支承刚度范围为17.5至175 MN / m,并且预测了转子轴承系统的超临界速度。具有内置油箱油箱的润滑系统旨在为定子铁芯提供冷却并润滑交流发电机轴承。专门设计的固定装置可将空气涡轮轴分别插入交流发电机转子和从交流发电机转子中抽出,以确保在组装和拆卸过程中交流发电机轴承不会过度加载。该设备配备了压力,温度和流量传感器,用于除速度和振动传感器外还用于压缩空气和润滑油。由于钻机的旋转/超速极高,因此考虑并实施了一些安全措施。

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