目录
摘 要..................................................................................................................I
Abstract.............................................................................................................II
1 前言................................................................................................................1
1.1 课题的来源......................................................................................................................1
1.2 课题研究的目的和意义..................................................................................................1
1.3 课题国内外研究现状......................................................................................................2
1.4 课题研究的主要内容......................................................................................................3
2 直流电机 PWM 调速系统方案设计.............................................................4
2.1 直流电机..........................................................................................................................4
2.2 直流电机调速原理..........................................................................................................7
2.4 基于单片机的直流电机 PWM 调速方案.......................................................................9
2.5 基于 FPGA 的直流电机调速方案................................................................................10
2.6 方案论证........................................................................................................................11
3 直流电机 PWM 调速控制电路设计...........................................................12
3.1 系统工作原理................................................................................................................13
3.2 键盘电路设计................................................................................................................14
3.3 系统时钟电路设计........................................................................................................16
3.4 H 型桥式驱动电路设计................................................................................................17
3.5 电源电路设计................................................................................................................19
3.6 主要元器件简介............................................................................................................20
4 控制逻辑 VHDL 描述.................................................................................21
4.1 VHDL 硬件描述语言....................................................................................................21
4.2 FPGA 内部逻辑组成.....................................................................................................24
4.3 PWM 脉宽调制信号产生电路描述..............................................................................25
4.4 运行控制逻辑电路描述................................................................................................29
5 直流电机 PWM 调速系统仿真...................................................................31
5.1 FPGA 开发环境的介绍.................................................................................................31
5.2 建立工程项目................................................................................................................33
5.3 正/反转控制仿真...........................................................................................................38
5.4 启/停控制仿真...............................................................................................................39
5.5 加/减速仿真...................................................................................................................40
5.6 仿真结果分析................................................................................................................41
6 总结..............................................................................................................42