分析判据方程发现，弹性失稳与圆柱体的半径、内禀尺度和失稳波长相关。
Through the analysis of the equation, it is found that the elastic instability is relevant to the radius, intrinsic scale and instable wavelength of the cylinder.
利用能量泛函变分的方法导出了发生弹性失稳的非经典边界条件，得到了失稳的判据方程。
The non-classic boundary condition of the elastic instability has been educed by the energy functional variation analysis. So a criterion equation of the elastic instability can be got.
以热保护为研究对象，充分考虑了电机的热积累现象，通过求解热平衡微分方程的方法，给出了新的电动机过载保护判据。
Based on the method of solving heat balance differential equation, a novel over-load protection criterion for electric motor is presented in the paper considering the heat accumulation of motor.
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