摘要
准确高效求解非正弦条件下的磁损耗,对电工装备发热分析及优化设计具有重要意义。为了研究脉冲宽度调制(pulse width modulation,PWM)激励下铁磁材料的磁损耗建模方法,通过搭建磁通密度可控的PWM激励磁特性测试系统,测量获得不同工况下硅钢片的磁滞特性和损耗特性数据,并分析PWM激励的特征(电压波形、磁密波形、调制比)对损耗各分量的影响。同时,结合PWM激励时材料磁滞过程的分析,考虑电压突变为零时松弛过程对剩余损耗的影响,提出一种计及PWM激励特征及松弛过程的改进损耗分离模型,实现PWM激励下磁损耗的有效计算,并进行相关的实验验证。仿真及实验结果表明,所建立的模型具有较高的计算精度和工程适用性。
Solving the magnetic loss under non-sinusoidal conditions accurately and efficiently is of great significance to the heating analysis and optimal design of electrical equipment. The pulse width modulation(PWM) excitation characteristic test system was established to study the calculation method of magnetic loss of ferromagnetic materials under PWM excitation. The hysteresis characteristics and loss characteristics of silicon steel sheets under different working conditions were measured. Based on that, the influence of PWM excitation characteristics(waveforms of voltage and magnetic flux density and modulation index) on each loss component is analyzed. At the same time, the hysteresis process during PWM excitation is analyzed, combining with the influence of magnetic relaxation processes on residual loss, an improved loss separation model under PWM excitation characteristics and magnetic relaxation was proposed, which can effectively calculate the magnetic loss. The simulation and experimental results show that the improved loss separation model in this paper has high accuracy and engineering applicability.
作者
赵志刚
赵瑞
张学增
ZHAO Zhigang;ZHAO Rui;ZHANG Xuezeng(Hebei University of Technology,Hongqiao District,Tianjin 300132,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2021年第18期6431-6439,共9页
Proceedings of the CSEE
基金
国家自然科学基金项目(51677052,52077053)
河北省人才工程培养资助项目(A201902009)。
关键词
脉冲宽度调制
松弛过程
铁磁材料
损耗分离
pulse width modulation(PWM)
magnetic relaxation processes
ferromagnetic materials
loss separation
