A METHODICAL APPROACH TO DETERMINE IMPORTANT THERMAL PARAMETERS OF A PERMANENT MAGNET ALTERNATOR

M. Kulan, N. Baker, S. Turvey
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Abstract

This paper presents a thermal analysis methodology of a permanent magnet (PM) machine used in an aerospace application. Thermal uncertainties and important thermal parameters due to manufacture and assembly have been exploited by conducting several thermal tests in the machine pre-assembly stages. Steady state DC thermal tests of the stator windings at standstill are crucial to understand the main heat paths in the machine structure. Therefore, thermal data collected from the stator windings and laminations in steady state DC tests are used to calibrate the 3D finite element (FE) thermal model of the machine by employing lumped parameter thermal network (LPTN) and short time thermal transient tests for the windings. It is shown that the thermal experiments in pre-assembly and post-assembly stages are required to obtain a more accurate machine thermal model. Authors report that effective slot thermal conductivity is the principal thermal parameter which needs to be estimated correctly to model an electrical machine thermally and also that off-tooth winding of the machine causes a poor effective slot thermal conductivity. Sensitivity of important thermal parameters on the winding temperature variation is also described by utilising a calibrated 3D FE thermal model of the proposed alternator.
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一种确定永磁交流发电机重要热参数的方法
本文介绍了一种航空航天用永磁电机的热分析方法。通过在机器预装配阶段进行几次热测试,利用了由于制造和装配而产生的热不确定性和重要热参数。定子绕组静止状态下的稳态直流热测试对于了解电机结构中的主要热路径至关重要。因此,采用集总参数热网络(LPTN)和绕组短时间热瞬态测试,利用稳态直流试验中定子绕组和片层的热数据,标定了机器的三维有限元热模型。结果表明,为了获得更精确的机床热模型,需要在装配前和装配后进行热实验。有效槽热导率是建立电机热模型需要正确估计的主要热参数,电机的离齿绕组导致有效槽热导率差。重要的热参数对绕组温度变化的敏感性也通过使用校准的三维有限元热模型描述了所提出的交流发电机。
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