Using coordinate transformation, we study the event horizon of accelerating non-stationary black holes, the equation of event horizon surface is calculated out.
采用坐标变换的方法，研究几种加速运动动态黑洞的事件视界，得到了黑洞的视界面方程。
The structure and permanent magnet synchronous motor model is presented, and then the mathematical model and state equation are structured based on the stationary and rotating coordinate system.
介绍了永磁同步电机的结构和模型，并在静止坐标系和旋转坐标系中建立数学模型和状态方程。
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