PWM逆变器供电下电机铁心损耗的解析计算

Analytical Calculation of the Iron Losses of Electric Machine Fed by PWM Inverter

在Bertotti分立铁耗计算模型的基础上,采用贝赛耳函数,推导PWM逆变器供电下硅钢片损耗的计算模型,该模型考虑逆变器参数对材料损耗的影响,建立PWM供电与标准正弦供电时材料损耗之间的数量关系,为电工材料性能的研究提供了理论依据。通过改进的爱泼斯坦方圈实验,给出一种非正弦供电下电工材料性能的实验研究方法,实验结果与理论值吻合较好。采用PWM逆变器供电时的三相异步电动机进行样机实验,结果表明,该计算模型对PWM供电下电机铁心损耗的理论计算具有很好的工程应用价值。

Based on the Bertotti iron loss separate model,a calculation model of iron losses of electric magnetic material fed by PWM inverter is proposed using the Bessel function, considering the influence of the inverter parameter, the numerical relationship of material loss between sinusoidal voltage supply and PWM voltage supply is presented, it provides a new theory of the study on electric material. By improving on the Epstein frame measuring system, a method is proposed to measure the material loss under non-sinusoidal voltage, experimental results agree with the results computed well. Finally, two three-phase experimental induction machines fed by inverter are considered, the results prove the model is valid.