提出一种用于电机损耗精细化分析的分段变系数铁耗计算模型，该模型以经典Bertotti三项常系数铁耗模型为基础，引入涡流损耗附加磁通密度高次项及磁滞损耗附加磁通密度低次项，用于考虑磁路饱和导致涡流损耗增加及谐波磁场引起局部磁滞损耗增加的现象，同时，该模型中主要系数均随磁通密度幅值和频率变化，能很好地反映基波及谐波磁场对铁耗的影响，并对磁滞、涡流及异常损耗进行准确分离，实现铁耗精细化分析。为了验证该文所提模型的有效性及准确性，以Y132 S-4、5.5 kW和YX3-250 M-4、55 kW两台感应电机为例，利用文中模型与经典Bertotti三项常系数模型对两台电机在不同电压下的空载铁耗进行实测和计算对比，结果表明该文所提模型在较宽范围内与实测值吻合程度较高。%This paper proposed a precise iron losses prediction model with piecewise variable coefficients. Based on the Bertotti’s three-term iron loss model,an additional flux density higher-order term and an additional flux density lower-order term are introduced to consider the increased eddy current loss and the local hysteresis loss caused by magnetic saturation and harmonic field,respectively. Meanwhile,the main loss coefficients are varying with the amplitude and frequency of the flux density,through which the influence of the fundamental and harmonic fields on iron losses are considered effectively. At the same time,the hysteresis loss,eddy current loss,and excess loss can also be predicted accurately. To verify the effectiveness of the presented model,the experimental validations are carried out on two induction motors,i. e. Y132S-4,5. 5 kW and YX3-250M-4, 55 kW,under different supply voltages with no-load. Both the presented model and Bertotti’s three-term iron loss model are used to predict the iron losses of the above motors. It reveals that the iron loss predicted by the presented model agree well with the tested ones across a wide voltage ranges.
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