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1引言当今在自动控制可逆调速系统中,可控硅一电动机系统的可逆线路划分两大类,典型的是三相全控桥式整流、励磁反接的可逆线路,采用接触器切换,实现可逆运转。另一类方式是采用两组可控硅装置反并联电枢反接的可逆线路。这两种方式反向过程都比较慢,因为它们的制动都是由逆变状态来提供回馈制动,而且控制较复杂,故障率高,维修量比较大,必然干扰生产的连续性,而且驱动的直流电机电刷等也要经常维护。其优点是具有较高精度的静差特性和无级调速。
1 Introduction Today in the automatic control of reversible speed control system, a reversible circuit thyristor motor system is divided into two categories, typically three-phase full control bridge rectifier, reversing excitation reverse line, the use of contactor switch to achieve Reversible operation. Another way is to use two sets of thyristor anti-parallel armature reverse reversing circuit. The reverse process of these two methods is relatively slow, because their braking is provided by the inverter state feedback braking, and control more complex, high failure rate, maintenance is relatively large, inevitably interfere with the continuity of production, and Driven DC motor brush should also be maintained. Its advantage is that it has higher accuracy of static characteristics and stepless speed regulation.