计及高次谐波影响的高密度永磁同步电机铁耗计算

Calculation of Iron Loss of High Density Permanent Magnet Synchronous Motor Considering the Influence of Higher Harmonics

在经典Bertotti三项式常系数铁耗计算模型的基础上,基于谐波分析原理,引入涡流损耗、磁滞损耗和附加损耗补偿系数,提出了一种计及高次谐波影响的高密度永磁同步电机(PMSM)铁耗计算模型。该模型中的补偿系数均随磁密幅值、频率和畸变率变化,能较好地反映基波及谐波磁场对铁耗的影响。为了验证该模型的有效性及准确性,以48槽/8极内转子和36槽/48极外转子两台PMSM为研究对象,将模型的计算值、有限元仿真结果和试验数据进行对比分析。结果表明,铁耗计算模型有较高的精度,特别适用于磁密幅值与频率变化范围大的场合。

Based on the classical Bertotti trinomial constant coefficient iron loss calculation model and the harmonic analysis principle, a high density permanent magnet synchronous motor (PMSM) iron loss calculation model considering eddy current loss, hysteresis loss and additional loss compensation coefficient was proposed. The compensation coefficients in the model varied with the amplitude, frequency and distortion rate of magnetic density, which could better reflect the effect of fundamental wave and harmonic magnetic field on iron loss. In order to verify the validity and accuracy of this model, two PMSMs with respectively 48 slots/8 poles inner rotor and 36 slots/ 48 poles outer rotor were taken as examples to compare the calculated value of the model with the finite element simulation results and experimental data. The results showed that the iron loss calculation model proposed had higher accuracy, and was suitable for applications in a wide range of magnetic density amplitude and frequency especially.