低负荷时基于虚位移原理的计算方法容易受到气隙剖分策略的影响，因此在低负荷状态下，应尽量采用麦克斯韦应力法。
The methods based on virtual work principle are more easily affected by the gap mesh strategy under light loads. Accordingly, the Maxwell stress method should be taken under light load conditions.
利用傅里叶分解及能量虚位移法，推导了磁阻转矩的计算公式。
The calculation formula of the cogging torque are derived by the Fourier decomposition and the virtual displacement method.
该法将虚位移原理推广应用于有限单元的节点，从而得到用以描述局部电磁力分布的等效节点力。
The distribution of local magnetic force is described with an equivalent node force, which is derived from an extended application of virtual work principle to FEM node.
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