刮板输送机作为综采工作面关键机械设备，其性能直接决定了井下煤炭开采的效率及成本的高低，而驱动系统是保障刮板输送机性能稳定、高效运行的首要条件。 

为解决刮板输送机传统异步驱动系统因减速器而造成的传动效率低、故障率高、可靠性低等问题，基于永磁同步电机设计了1 套输送量可达1500万t/a的刮板输送机永磁直驱系统，并匹配计算了所需了永磁同步电机功率、转速以及变频控制器容量。

根据永磁直驱系统与刮板输送机之间的机-电耦合关系，利用MATLAB / Simulink 仿真软件搭建刮板输送机永磁直驱系统的机-电耦合模型，仿真分析了永磁直驱系统在空载启动、满载运行、多边形效应等多种工况下永磁同步电机的输出转速、转矩、三相电流以及刮板链的速度、加速度、张力等动态特性变化规律。

仿真结果表明，永磁直驱系统在刮板输送机启动及负载变化时能够快速响应且比较准确，由于减少了减速器的柔性缓冲，电机输出转速与转矩对负载突变响应波动较大；永磁直驱系统的动态响应在突变负载下与突变量成正相关关系，应当从驱动系统控制算法的优化角度出发减小波动，改善其性能;多边形效应影响系统速度控制的稳定性，机头链轮啮合处的链条更易受到多边形效应的影响。

最后，搭建小功率永磁同步电机直驱模拟试验台架，将仿真得到的机械负载特性曲线等效处理后通过测功机加载输入，开展了刮板输送机永磁同步电机直驱系统的模拟驱动试验。

试验结果表明，台架试验测得的永磁同步电机动态特性曲线与对应仿真试验得到的永磁同步电机动态曲线的变化规律基本一致，从而从侧面验证了本文所建立刮板输送机永磁直驱系统机-电耦合模型的正确性。

In order to solve the problems of low transmission efficiency,high failure rate and low reliability caused by the existence of reducer in the traditional asynchronous drive system for scraper conveyor,based on the permanent magnet synchronous motor,a permanent magnet direct drive system for the scraper conveyor with an annual capacity of 15 million tons is de-veloped,and the required power,speed and variable frequency controller capacity of the perma- nent magnet syn-chronous motor are calculated. According to the electromechanical coupling relationship between the permanent magnet direct drive system and the scraper conveyor,the electromechanical coupling model of the scraper conveyor is established in the MATLAB / Simulink. And the law of dynamic characteristic change of the output speed, torque,and three-phase current of PMSM and chain speed,acceleration and displacement of scraper conveyor are sim- ulated and analyzed under typical working conditions such as no-load startup,full load,and polygon effect. The simula- tion results show that the permanent magnet direct drive system can respond quickly and accurately when the scraper conveyor starts and the load changes. The output speed and torque of the motor fluctuate greatly in response to the sud- den load change without reducer. The dynamic response of the permanent magnet direct drive system has a positive correlation with the sudden change. Therefore,the optimization of the control algorithm of the drive system should be considered to improve its performance. The polygonal effect affects the stability of the speed control system,and the chain at the mesh of the head sprocket is more susceptible to the polygonal effect. Finally,the simulation test bench of small power PMSM direct drive is established,and the mechanical load characteristic curve obtained from the simula- tion is treated equivalently and then input through the dynamometer,and the simulation drive test of the PMSM drive system for scraper conveyor is carried out. The results show that the change trend of the characteristic curves of the PMSM obtained by the experiment is basically consistent with the characteristic curves of the PMSM obtained by the simulation,thus the correctness of the electromechanical coupling model of the PMSM direct drive system for scraper conveyor is verified from the side.