【摘要】 液化天然气(liquefied natural gas, LNG)的饱和温度为-161℃,用于传输LNG的泵用电机产生的损耗会使其发热量增加，容易导致LNG发生汽化。电机铁心材料通常采用硅钢片制成，传统的低硅硅钢片(3%Si)在超低温环境下的铁心损耗较常温时增加，不利于抑制电机的发热。针对以上问题，分别对比研究低硅硅钢片与高硅硅钢片(6.5%Si)在超低温环境下的损耗特性，通过不同温度下的测试实验研究高硅硅钢片的损耗随温度变化的规律，结果表明高硅硅钢片在超低温下损耗增幅远小于低硅硅钢片，更适合用于超低温电机。基于高硅硅钢片在超低温环境下的损耗特性，建立了引入温度系数和校正因子的超低温环境下高硅硅钢片的变温铁心损耗计算模型，通过多组不同磁密和频率下的实测值与模型计算值进行对比，结果验证了该模型的准确性。更多还原

【Abstract】 The saturation temperature of liquefied natural gas(LNG) is-161 ℃, and the losses generated by the pump motor used to transport LNG increase its heat generation, which can easily lead to LNG vaporization. The iron core material of motors is usually made of silicon steel sheets. Traditional low silicon silicon steel sheets(3% Si) have increased iron core loss in ultra-low temperature environments compared to room temperature, which is not conducive to suppressing the heating of motors. In response to the above issues, the loss characteristics of low silicon steel sheets and high silicon steel sheets(6.5% Si) in ultra-low temperature environments were compared and studied. Through testing experiments at different temperatures, the law of loss variation of high silicon steel sheets with temperature was studied. The results show that high silicon steel sheets are more suitable for ultra-low temperature motors. Based on the loss characteristics of high silicon steel sheets in ultra-low temperature environments, a variable temperature core loss calculation model for high silicon steel sheets in ultra-low temperature environments by introducing temperature coefficients and correction factors was established. The accuracy of the model was verified by comparing the measured values and model calculated values under different magnetic densities and frequencies.更多还原