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晶闸管可逆直流调速系统在我国应用已非常广泛,它多应用于机床的主传动和有传动装置的机械设备,其特点是调速范围宽、调速精度高、可靠性高、噪声低,可在四象限运行。这种系统一般电流环为内环,速度环为外环。调速方式两区域无级调速;低于额定转速为恒转矩方式;高于额定转速采用恒功率弱磁调速。但是,这种装置有一个共同的弱点:容易逆变失败,造成晶闸管,甚至整个系统的损坏。逆变失败的原因有多种,仅讨论一种应用中遇到的问题。 下图是一个具有代表性的晶闸管可逆直流调速系统的原理框图。
Thyristor reversible DC speed control system in our country has been widely used, it is mainly used in the main drive and transmission equipment, machinery and equipment, which is characterized by a wide range of speed regulation, high speed precision, high reliability, low noise, Running in four quadrants. This system is generally the current loop for the inner ring, the outer ring for the speed loop. Speed regulation Two stepless speed regulation; below the rated speed constant torque method; higher than the rated speed using constant power flux weakening speed. However, this device has one common weakness: easy inverter failure, resulting in thyristor damage, or even the entire system. There are many reasons for the failure of inverters, only one of the problems encountered in the application. The following figure is a representative of the thyristor reversible DC speed control system block diagram.