摘  要：针对螺旋压力机转动惯量大、启动-制动频繁的特点和转矩的高动态控制问题，分析了压力机的机械结构和工作原理，提出了一种基于永磁无刷直流电机驱动的压力机伺服控制系统，建立了系统的电机-负载模型，设计了基于前馈和PID闭环的控制器，其中PID作为基本的控制器，主要实现系统校正和抗干扰的功能，前馈回路提供系统所需的主要增益，在不影响控制系统稳定性的前提下可以缩短指令响应时间，同时采用基于Buck降压斩波变换器的PAM调速方式来抑制永磁无刷直流电机的转矩脉动。实验与仿真验证了控制方法的有效性。
关键词：螺旋压力机；永磁无刷直流电机；前馈控制；Buck变换器；PID

Abstract: Aiming at the characteristics and the high dynamic torque control request of cress press, a servo system driven by permanent magnet brushless direct current motor(BLDCM) was designed according to the mechanical construction and working principle of cress press. The motor load model of the system was analyzed and the controller based on feedforward and PID strategy was also designed. The PID controller was used to adjust the system deviation while the feedforward controller could greatly reduce the response time of instruction. Furthermore, the feedforward controller would not damage the stability of the system and the PAM strategy which is based on the Buck converter could reduce the torque ripple of the BLDCM. The validity of the proposed approach was verified by the simulation and experiment results.
Key words: cress press；BLDCM； feedforward control； Buck converter；PID