说明：  自己搭建的matlab电机仿真中的SVPWM模块，其中U_alpha,U_beta为电压输入，T为开关周期，U_dc为直流母线电压，PWM为六路脉冲信号，绝对好用
(Matlab built their own motor simulation SVPWM module, which U_alpha, U_beta the voltage input, T is the switching cycle, U_dc for the DC bus voltage, PWM pulse signal for the six-way, absolutely easy to use )