介绍了反电动势过零位置检测的原理及实现方法，并采用了数字式转速、电流双闭环控制。
One kind of sensorless control system for brushless DC motor based on DSP was introduced and the principle of back-EMF zero-crossing detection and realization method was discussed in detail.
冻结。使当前选择的物体的变换变成物体的零位置。你可以从子菜单中选择冻结移动，旋转，缩放或者所有。
Freeze. Makes the current transformations on the selected objects be the objects' zero position. You can select Translate, Rotate, Scale, or All from the submenu.
冻结。使当前选择的物体的变换变成物体的零位置。你可以从子菜单中选择冻结移动，旋转，缩放或者所有。
Freeze. Makes the current transformations on the selected objects be the objects' zero position. You can select Translate, Rotate, Scale, or All from the submenu.
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