采用S函数编写的空间矢量扇区检查模块，利用两相静止坐标系下的电压分量直接判断所处扇区，可用于异步电机，同步电机的Matlab矢量控制仿真-S-function written using space vector sectors check module using the voltage component two-phase stationary coordinate system in which the judge directly sector, can be used for asy