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。
2
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.