The main magnetic field of Magnetic Resonace Imaging( MRI)device is simulated by using the finite element method.

采取了二维有限元法模拟核磁共振成像（MRI）装置的主磁场。

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Numerical implementations show that this method provides a main magnetic field with homogeneity and strength at the imaging region, which is defined outside of the magnet structure.

数值结果显示，本文提出的设计方法给出的设计方案能够在磁体结构外部的成像区域形成均匀并且强大的主磁场。

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And besides, under a large power angle condition, the magnetic field distortion will enlarge air-gap part of the main magnetic path and influence the value of the air-gap voltage ES.

而在功角较大状态下发生的磁场畸变则增长了主磁路经过气隙的部分，同样会影响合成电流产生气隙电势的大小。

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