有霍尔传感器的直流无刷电机启动换相及比例积分调速控制程序及保护程序，无霍尔传感器直流无刷电机启动及比例积分调速控制程序。-A Hall sensor commutation of brushless DC motor starters and proportional-integral speed control procedures and savers, brushless DC motors without Hall sensors start and proportional-integ