1、 1 PWM 脉宽直流调速系统设计 摘要摘要 直流调速系统具有调速范围广、精度高、动态性能好和易于控制等优点，所以在 电气传动中获得了广泛应用。本文从直流电动机的工作原理入手，建立了双闭环直流调速 系统的数学模型， 并详细分析了系统的原理及其静态和动态性能。 然后按照自动控制原理， 对双闭环调速系统的设计参数进行分析和计算，利用 Simulink 对系统进行了各种参数给 定下的仿真，通过仿真获得了参数整定的依据。在理论分析和仿真研究的基础上，本文设 计了一套实验用双闭环直流调速系统，详细介绍了系统主电路、反馈电路、触发电路及控 制电路的具体实现。对系统的性能指标进行了实验测试，表明所设计的双闭
2、环调速系统运 行稳定可靠，具有较好的静态和动态性能，达到了设计要求。采用 MATLAB 软件中的控制 工具箱对直流电动机双闭环调速系统进行计算机辅助设计，并用 SIMULINK 进行动态数字 仿真,同时查看仿真波形,以此验证设计的调速系统是否可行。 关键词 直流电机 直流调速系统 速度调节器 电流调节器 PWM 调速系统 双闭环系统 仿真 Abstract DC motor has been widely used in the area of electric drive because of its neatly adjustment, simple method and DC motor
3、 has been widely used in the area of electric drive because of its neatly adjustment, simple method and smooth control in a wide range, besides its control performance is excellent. Beginning with the theory of DC motor, this dissertation builts up the mathematic model of DC speed control system wit
4、h double closed loops, detailedly discusses the static and dynamic state performance of the system. Afterward, according to automation theroy this papar calculates the parameters of the system. Then, this dissertation simulates and analyzes the system by means of Simulink. The results of simulation are consistent with theory calculation. Some experience was acquired through simulation. Based on the theory and simulation, this dissertation designs a DC speed control system with double close
