The calculation formula of the cogging torque are derived by the Fourier decomposition and the virtual displacement method.
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。
Theoretical studies of curved girders mainly adopted the methods of balanced method, energy method and variation-based method of virtual work (displacement).
曲线梁的理论研究主要采用平衡法、能量法以及基于变分原理的虚功(位移)方法。
The virtual displacement method specifies that the sum of the shaded areas is equal to the sum of the stippled areas.
虚位移法规定阴影面积之和等于点画面积之和。
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