杂散损耗分离技术用于永磁同步电机高效设计

Stray Loss Separation Technique for High-efficiency PMSM Design

随着超高性能磁性材料的广泛应用,空调压缩机用变频永磁同步电机的能效已达极致,进一步提升异常困难。目前,电机结构参数优化仍是能效提升的重要技术手段,各项损耗的准确估算及规律的探究则是能效进一步提升的关键。本文针对变频永磁同步电机,系统分析了损耗的分类,提出了损耗配比系数K的概念,用以评价电机电磁设计额定点的效率是否最优;基于K值概念,用FEM法对一款变频永磁同步电动机的结构参数进行了电磁方案再优化,以提升电机能效;设计了基于线性回归的杂散损耗实验分离方法,并对优化前后的样机进行了损耗分离、效率和损耗配比系数的计算,结果表明优化后的电磁方案在额定工况点的损耗配比系数K更接近于1、效率提升显著。

With the widespread application of higher-performance magnetic materials,the variable-frequency permanent magnet synchronous motors(PMSM)for air-conditioning compressor have approached extreme high efficiency,and it is difficult to further improve their efficiency.At present,the optimization of motor structure parameters is still an important technical mean to improve efficiency,and the accurate estimation of various losses and the exploration of their laws are the key to further improve efficiency.In this paper,the loss classification of PMSM was analyzed systematically,and the loss ratio K was proposed to evaluate whether a PMSM’s efficiency at rated point was optimal;based on K,the structural parameters of an existed PMSM were optimized by FEM to improve its efficiency;the experimental separation method of stray losses based on linear regression was designed,experiments were performed,and the loss separation,efficiency and loss ratio were calculated for both the prototypes before and after optimization.The results show that the efficiency of the optimized prototype is significantly improved at the rated operating point,and its loss ratio K is very close to 1.