Design and Experimental Research on the Downhole Turbine Generator with an Outer Magnetic Rotor
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摘要: 为了满足自动垂直钻井系统涡轮发电机寿命及功率需求,采用理论计算方法和仿真分析方法确定井下外磁转子式涡轮发电机电气参数,建立仿真分析模型,进行电磁场、场路耦合以及温度场分析,对发电机电磁特性、损耗以及温度变化进行数值模拟。理论计算和数值模拟结果表明,发电机输出功率达到设计额定功率800 W,在额定转速下的最大功率输出时定子稳态温升23 ℃。利用现场试验对理论计算与仿真数据以及发电机寿命进行验证,试验结果为额定转速下最大输出功率1 000 W,稳态定子温升20.5 ℃,仿真与试验数据基本吻合,发电机运行320 h后仍能正常工作。研究表明,井下外磁转子式涡轮发电机功率输出性能达到设计目标,可以为井下各类仪器设备用电源提供技术保障。Abstract: A design and experimental research on downhole outer magnetic rotor turbine alternator was proposed to fulfill the life and power requirements of the turbine alternator in the vertical drilling system.The electrical parameters of the alternator were designed by theoretical and simulation methods,a simulation model was built to carry out electromagnetic field,field-circuit coupling and thermal field simulation,the electromagnetic characteristics,loss and temperature increments data were gained by simulation.The analysis result showed that the power output the alternator reached design targets(800 W),and the maximum stable state tempreture increments at maximum power output were 23 ℃.Then a field experiment was carried out to verify the theoretical calculation and simulation.During the experiment,the stable maximum power output reached 1 000 W,stable state tempreture increments were 20.5 ℃,after 320 h field experiment,the alternator worked normally.The research and experiment shows that the performance of downhole outer magnetic rotor turbine alternator reaches design targets,and it might be a solution to power requirements of vertical drilling system and other downhole instruments.
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