| Abstract |
Commonly known analytical prediction methods for winding loss in switched reluctance machines providecomparatively inaccurate results but are very fast. Finite element analyses, however, yield ratherexact results but at high computational cost. This paper introduces harmonic superposition as a thirdapproach that promises sufficiently accurate loss estimations at low computational cost. At that point,the method of superposition, which is also used in all analytical methods, is reinvestigated. Conventionalanalytical approaches use analytical approximations to calculate the harmonic loss components, whichare superposed. The proposed approach determines the harmonic components by finite element analysesduring a one-time preprocessing step. The results of this pre-simulation are examined by calculatingthe resistances of every single conductor. Their dependency on frequency, rotor position and current ispresented. In addition to the improved calculation of the harmonic components, a modified superpositionmethod is presented. This modified superposition method takes leakage flux and saturation effects intoaccount. Both superposition methods are applied at an exemplary operating point and the results arecompared to a transient finite element simulation. Simulation results are presented for an automotiveSRM. |
