采煤机机电传动系统调速动态特性分析

为研究滚筒调速的可行性及调速对传动系统动态性能的影响,采用MATLAB/Simulink搭建了采煤机截割-牵引耦合机电传动系统动力学模型.针对截割部过载工况,综合考虑采煤机可靠运行和高效生产,制定了4种调速降载方案,并提出了通过截割电机电流计算目标切削厚度、依据目标切削厚度选择调速方案的方法.最后通过仿真对比了各种调速方案下电机和传动系统的动态响应特性,结果表明:当截割电机过载倍数较小时,采用滚筒调速方案能够在降低系统负载的同时使采煤生产率不受影响;当过载倍数较大时,采用牵引调速方案可获得较高的系统可靠性,而采用牵引-滚筒顺序调速方案可获得较高的采煤生产率.

Speed adjustment characteristics analysis for electromechanical transmission system of coal shearer

To investigate the feasibility of speed adjustment of the drum and the influence of speed adjustment on the dynamic performance of the transmission system, a cutting- haulage coupled model of the electromechanical transmission system of the coal shearer was established using MATLAB/ Simulink. Then, considering reliable operation and efficient production, four types of speed adjustment schemes were formulated for the overload conditions of the cutting unit. The method of selecting the speed adjustment scheme was proposed according to the target cutting thickness, while the motor current was chosen as a feedback signal to calculate the target cutting thickness. Lastly, the electromechanical dynamic characteristics of the system corresponding to different adjustment schemes were simulated and compared. The results show that when the overload ratio of the cutting motor is small, using the drum speed adjustment scheme can not only reduce the system load, but also enable the coal- mining productivity to not be affected. Conversely, the system reliability can be improved when the haulage speed adjustment scheme is used, and using the haulage- drum sequential speed adjustment scheme can lead to high productivity.