前言在石油化工企业,选用的风机品种很多,型式和作用也有很大区别,然而它们的工作原理是基本相同的。风机接通电源之后,就能连续工作,而且是以一种不变的速度运行,因此作为风机的动力机械一电动机的负荷也基本不变。而本文所介绍的风机自动调角却与上述情况不同,只要根据需要选择合理的控制方案,既可以调整风机的叶片角度,又能够改 Preface In the petrochemical industry, the choice of a large number of fans, the type and role are also very different, but their working principle is basically the same. After the fan is connected to the power supply, it can work continuously and operate at a constant speed. Therefore, the load on the motor as a fan motor is basically the same. This article describes the fan angle automatically adjusted with the above situation is different, as long as the need to choose a reasonable control program, both to adjust the fan blade angle, but also to change