三相异步电动机变频调速的节能研究

Research on Energy-saving Control of the Three-phase Asynchronous Motor Driving in Variable Frequency Speed Regulation Environment

针对电机变频调速的供电电压中含有高次谐波而导致定转子铁芯产生损耗发热的问题进行研究，首先对变频调速系统的各种损耗的产生机理进行理论分析，然后着重研究三相异步电动机的铁损，分析磁滞损耗、涡流损耗的产生原因并建立了准确的数学模型。最后对不同的铁芯材料（纯铁、硅钢片、铁氧体）做定性定量的分析，搭建实验平台验证铁芯材料在不同的交流频率下的损耗变化规律。结果表明普通电机在变频驱动下，硅钢片作为铁芯的电机工作在50-100Hz的工况下、铁氧体作为铁芯的电机工作在1000Hz频率以上、工业纯铁用于直流供电的磁路工况下更为节能。

In this paper,the rotor core generating heat loss problems are researched,which are caused by high harmon-ics in the motor of variable frequency for speed regulation. Firstly,the producing mechanisms of various loss in frequen-cy control system are analyzed in theory. Then, the iron loss of three-phase asynchronous motor are focused on re-search;the reasons of hysteresis loss and eddy current loss are analyzed and a precise mathematical model is estab-lished. At last, the qualitative and quantitative analysis for the different core materials （iron, silicon steel and ferrite） are carried out;the experimental platform is established in order to test and verify the change law of the iron core ma-terial’s loss in the different frequency.The results show that under ordinary motor variable frequency driving and the core of silicon steel motor in 50-100Hz operating conditions and the ferrite core motors working as frequencies above 1000Hz,industrial iron for DC-powered magnetic conditions is more energy efficient.