铁磁材料非正弦激励下的损耗计算方法研究

发布时间：2018-04-19 17:10

本文选题：铁芯损耗 + 非正弦激励　；参考：《浙江大学》2017年硕士论文

【摘要】：据统计,每年我国所消耗的60%的电能被用于电机上。因此电机节能的提升能够对能源节约做出突出贡献,降低电机损耗对于提升电机的体系功率非常重要。而铁芯损耗在电机损耗中的占很大比重,目前针对实际电机的非正弦复杂激励工况下材料铁芯损耗的准确计算尚缺乏有效模型,为了解决这一问题,本文从铁损的物理机理出发,分别从公式计算与模型研究两方面对其展开系统研究。对现有的Steinmetz计算公式在实际应用情况下进行了检验,发现在实验所用的铁磁材料下应用Steinmetz公式存在较大的误差。经过分析指出了公式中的参数α受磁感应强度变化的影响,在特定的铁磁材料中提出了一种修正Steinmetz公式参数的方法;利用修正后的Steinmetz公式的参数,对计算非正弦激励下铁损的MSE公式的参数进行了替换,达到了提高MSE公式计算精度的效果。本文着重分析了磁感应强度变化率对铁芯损耗的影响,基于磁感应强度和其变化率与磁场强度的对应关系,提出利用插值法计算给定激励波形下铁芯损耗的方法,利用正弦波实验建立了任意激励下铁芯损耗的计算模型,可实现在宽广的连续磁感应强度变化率范围内的铁芯损耗的预测。研究改进了非正弦激励下铁损的公式计算和模型分析方法,通过实验在铁磁材料500ww470和500ww800中验证了改进方法的有效性。
[Abstract]:According to statistics, 60% of the electric energy consumed every year in China is used on the motor.Therefore, the promotion of motor energy saving can make an outstanding contribution to energy saving, and reducing motor loss is very important to enhance the system power of motor.However, the iron core loss accounts for a large proportion of the motor loss. At present, there is a lack of effective model for the accurate calculation of the material core loss under the complex non-sinusoidal excitation condition of the actual motor, in order to solve this problem,Based on the physical mechanism of iron loss, this paper makes a systematic study on iron loss from two aspects: formula calculation and model study.The existing Steinmetz formula is tested in practice, and it is found that there is a large error in the application of Steinmetz formula in ferromagnetic materials used in the experiment.After analysis, it is pointed out that the parameter 伪 in the formula is affected by the change of magnetic induction intensity, and a method for modifying the parameters of Steinmetz formula is proposed in particular ferromagnetic materials, and the parameters of the modified Steinmetz formula are used.The parameters of MSE formula for calculating iron loss under non-sinusoidal excitation are replaced and the accuracy of MSE formula is improved.In this paper, the influence of magnetic induction intensity change rate on core loss is analyzed. Based on the relationship between magnetic induction intensity and its change rate and magnetic field intensity, a method of calculating core loss under given excitation waveform by interpolation method is proposed.The calculation model of iron core loss under arbitrary excitation is established by using sinusoidal wave experiment, which can be used to predict the core loss in a wide range of continuous magnetic induction intensity variations.The formula calculation and model analysis method of iron loss under non-sinusoidal excitation are studied and improved. The effectiveness of the improved method is verified by experiments in ferromagnetic materials 500ww470 and 500ww800.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM271

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