RNAのための渦電流計算手法に関する考察

抄録

  In recent years, designing and analyzing of permanent magnet (PM) motors taking into consideration magnetic nonlinearity and eddy current loss in rare-earth magnets has increased in importance since the PM motors are driven by a three-phase PWM inverter and the working flux density is very high. In previous papers, we proposed a method for calculating the characteristics of PM motors based on reluctance network analysis (RNA). The proposed RNA model of the PM motors can be coupled with the inverter and mechanical system. Using the proposed model, we accurately calculated the iron loss in the stator core of the PM motor. However, the eddy current loss in the permanent magnets caused by carrier harmonics and slot harmonics was not discussed. We present here a method for calculating the eddy current loss based on an electric network that can be coupled with the RNA model. To verify the validity of the proposed method, the estimated values are compared with those obtained using a finite element method (FEM) and an experiment.