Second, a criterion of the stability of relative motion for the nonholonomic mechanical systems was obtained by using the equation of variation of energy.
其次，基于能量变化方程，给出了非完整力学系统相对运动的稳定性的一个判据；
And the equation of natural mechanical properties of SR motor is deducted from magnetic field energy.
由磁场能量推导出SR电机的自然机械特性方程序。
And the equation of natural mechanical properties of SR motor is deducted from magnetic field energy.
由磁场能量推导出SR电机的自然机械特性方程序。
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