In virtue of Fourier harmonic analysis, the air gap magnetic field corresponding to different conductivity in secondary conductive plane is divided into spatial fundamental waves and a series of harmonic waves, and the calculations of primary leakage reactance and starting current are given. 分析了次级为不同电导率材料时的气隙磁场,并采用傅里叶谐波方法将气隙磁场分解为空间基波和一系列谐波,相应给出了采用能量法对初级漏抗、起动电流的计算。