The air-gap macro element is reformulated such that rotation, rotor or stator skewing and rotor eccentricity can be incorporated easily. The air-gap element is evaluated using Fast Fourier Transforms which in combination with the Conjugate Gradient algorithm leads to highly efficient and memory inexpensive iterative solution scheme. The improved air-gap element features beneficial approximation properties and is competitive to moving-band and sliding-surface technique.

翻译：对气隙宏单元进行了重新表述，使得转动、转子或定子斜槽以及转子偏心可被便捷地纳入考虑。该气隙单元通过快速傅里叶变换进行评估，与共轭梯度算法相结合，形成了一种高效且内存占用低的迭代求解方案。改进后的气隙单元具有优良的近似特性，并能与移动带法和滑动面法相媲美。