开关磁阻电机的铁损分析与计算

Iron loss analysis and calculation of switched reluctance motor

针对开关磁阻电机(SRM)双凸极结构引起的铁心磁场复杂和铁损计算难以实现的问题,开展了SRM铁损计算方法的研究,对电机铁损与铁心磁密正交分量之间的关系进行了分析,根据铁心损耗正交等效理论提出一种计算SRM铁损的方法—椭圆法。应用Ansoft得到一台三相12/8的SRM的铁心磁密及其分量Br、Bt,并对磁密分量作了傅里叶分解,分别以对应的谐波幅值为长轴和短轴,画出了电机铁心椭圆形谐波磁密矢量图,再结合铁损计算公式计算了铁损。为对椭圆法的精确度进行评价,采用常规谐波分解法计算电机铁损,并与椭圆法计算结果进行了比较。研究结果表明,采用椭圆法计算铁损相对常规的谐波分解法计算更加准确,采用椭圆法可以更好的为SR电机的本体设计、绝缘材料的选取、冷却系统的设计等提供依据。

Aiming at the magnetic field analysis and iron loss calculation of switched reluctance motor（SRM, which has doubly salient structure, the method of iron loss calculation of SRM was investigated, and the relationship between the motor iron loss and quadrature components of core flux density was established. According to the core loss orthogonal equivalent theory, a method, Ellipse method, was presented to estimate the iron loss of SRM. A three-phase 12/8 SRM was analyzed with Ansoft so that the magnetic flux density and components Br, Bt could be got and their FFT could be achieved. The accuracy of the Ellipse method was evaluated on the comparison between the iron loss value using Ellipse method, and the iron loss value using Harmonic method. The results indicate that Ellipse method to calculate the iron loss is more accurate than the Harmonic method and more advantageous for the design of motor body, cooling systems and insulation materials of SRM.