直流偏置下正弦激励铁芯材料损耗计算及研究

发布时间：2018-05-04 06:09

本文选题：铁芯损耗 + 直流偏置磁场　；参考：《浙江大学》2017年硕士论文

【摘要】：电机在运行过程中不可避免地会产生损耗,而损耗除了会降低电机的运行效率,还会使电机内部温度上升,降低电机运行可靠性。相对于铜耗、机械损耗等,铁芯损耗由于其产生原理更为复杂,更难以计算准确。尤其当电机接入变频器之后,铁芯损耗在高频谐波下,甚至可能高于铜耗。故,铁芯损耗的准确计算对于提高电机效率以及增加运行寿命至关重要。在永磁电机、开关磁阻电机等运行过程中,铁芯将受到直流偏置磁场的作用,而直流偏置磁场对于铁芯损耗也会产生较大的影响,故本文着重从直流偏置磁场对于铁芯损耗的影响入手进行实验研究。本文搭建了材料测试实验平台,通过实验对50WW800硅钢片进行研究,测量在不同交流激励与直流偏置下,铁磁材料中的直流偏置磁场大小,并得到直流偏置磁感应强度与直流偏置磁场强度的关系,并实验求得交流磁场幅值对它的影响。之后,在大量实验的基础上,通过数据拟合的方式,得到磁场强度与磁感应强度以及直偏磁场的关系,并对未测量直偏磁场下的材料磁滞回线进行预测计算,预测准确度较高,误差很小。最后,通过磁滞回线与磁滞损耗的关系,得到损耗与交、直流磁感应强度的关系,并拟合得到曲面函数,实验数据越多,数据库拟合得到的曲面将越准确,通过数据库结合有限元软件计算,得到带气隙圆环样品铁芯的损耗,与实际测量值对比,验证数据库准确性。最后验证结果良好,误差均小于4%。
[Abstract]:The loss of the motor will inevitably occur in the process of operation, and the loss will not only reduce the efficiency of the motor, but also increase the internal temperature of the motor and reduce the reliability of the motor. Compared with copper consumption and mechanical loss, iron core loss is more complicated and more difficult to calculate accurately. Especially when the motor is connected to the inverter, the core loss may even be higher than the copper consumption under the high frequency harmonics. Therefore, the accurate calculation of core loss is very important to improve motor efficiency and service life. In the operation process of permanent magnet motor and switched reluctance motor, the core will be affected by the DC bias magnetic field, and the DC bias magnetic field will also have a great influence on the core loss. So this paper focuses on the effect of DC bias magnetic field on core loss. In this paper, a material test platform is set up, and the 50WW800 silicon steel sheet is studied through experiments. The magnitude of DC bias magnetic field in ferromagnetic material is measured under different AC excitation and DC bias. The relationship between DC bias magnetic induction intensity and DC bias magnetic field intensity is obtained, and the effect of AC magnetic field amplitude on it is obtained experimentally. After that, on the basis of a large number of experiments, the relationship between magnetic field intensity, magnetic induction intensity and direct bias magnetic field is obtained by the way of data fitting, and the hysteresis loop of material under unmeasured magnetic field is forecasted and calculated, and the prediction accuracy is high. The error is small. Finally, through the relationship between hysteresis loop and hysteresis loss, the relationship between loss, AC and DC magnetic induction intensity is obtained, and the surface function is fitted. The more experimental data, the more accurate the surface will be obtained by database fitting. Through the calculation of database and finite element software, the loss of sample iron core with air gap ring is obtained, and compared with the actual measurement value, the accuracy of the database is verified. The results are good and the errors are less than 4.
【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】：TM301;TM271

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