突变工况下滚筒式采煤机调速控制策略研究

基于Matlab/Simulink建立了包括采煤机牵引部、截割部和控制系统的整机耦合控制模型，针对煤岩夹杂引起的突变工况，以采煤机可靠运行和高效生产为目标，提出了基于截割电机额定转矩的截齿切削厚度控制目标的计算方法，得到煤层截割阻抗与截齿切削厚度控制目标的对应关系；基于滚筒负载特性和破岩能力制定了针对不同突变工况的滚筒调速控制策略和牵引-滚筒协调控制策略；最后将提出的上述两种调速控制策略与传统牵引调速控制策略进行对比。结果表明：当煤层突变载荷较小时，采用滚筒调速控制策略不仅可有效降低采煤机机电系统动载荷，而且可保持采煤生产率不变；当煤层突变载荷较大时，采用牵引-滚筒协调控制策略可有效降低采煤机机电系统动载荷，并对采煤生产率影响较小。

Research on drum shearer speed control strategies under impact conditions

A shearer coupling control model including cutting unit,traction unit and control system was built based on Matlab/Simulink.Aiming at the impact working condition that caused by coal rock inclusions,taking a reliable operation and high-efficient production of shearer drive system as the target,a computing method of target cutting thickness control variable was proposed based on the cutting motor running at rated torque.A corresponding relationship between impact load and target cutting thickness control variable was obtained.Different speed control strategies with different impact loads were formulated based on the load characteristics and cutting capability of drum.Finally,the two control strategies proposed above with the traditional traction speed control strategy was compared.The results show that when coal impact load is smaller,the drum rotation speed control strategy can not only reduce the impact load of mechanical and electrical system effectively,but also the coal productivity remains the same;when coal impact load is larger,the coordination control strategy of traction speed-drum rotation speed can not only reduce the impact load of mechanical and electrical system effectively,but also has a little influence on the coal productivity.