h型双极式pwm直流调速系统设计

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1、控制系统课程设计设计题目：H型双极式PWM直流调速系统设计19河北理工大学本科生课程设计成绩总评表学生姓名设计总成绩设计题目H型双极式PWM直流调速系统设计说明书评定成绩答辩成绩答辩时需要设计人回答的问题注：设计总成绩=说明书评定成绩（60%）＋答辩成绩（40%）19设计任务书(一)性能指标要求：稳态指标：系统无静差动态指标：；空载起动到额定转速时。(二)给定电机及系统参数：PN=220W,UN=48V,IN=3.7A,，nN=200r/min，Ra=6.5Ω电枢回路总电阻R=8Ω电枢回路总电感L=120mH电机飞轮惯量GD2=1.29Nm2(三)设计步骤

2、及说明书要求：1画出系统结构图，并简要说明工作原理。2根据给定电机参数，设计整流变压器，并计算变压器容量及副边电压值;选择整流二极管及开关管的参数，并确定过流、过压保护元件参数。3分析PWM变换器，脉宽调制器（UPW）及逻辑延时（DLD）工作原理。4设计ACR、ASR并满足给定性能指标要求。5完成说明书，对构成系统的各环节分析时，应先画出本环节原理图，对照分析。6打印说明书（A4），打印电气原理图（A4）。19目录一引言···············································1二系统构成和原理·············

3、······················1三PWM主电路设计····································3四电流调节器和转速调节器的设计····················44.1电流调节器ACR的设计·································44.2转速调节器ASR设计····································44.2.1电流环等效闭环传递函数····························74.2.2转速调节器结构的选择··················

4、············84.2.3时间常数的确定····································84.2.4转速调节器参数的选择······························84.2.5校验近似条件······································84.2.6校核转速超调量····································84.2.7转速调节器的实现··································9五基于SG3525为核心构成的控制电路·······

5、···········95.1SG3525芯片的内部结构及工作原理························9195.2逻辑延时环节···········································10六驱动电路设计········································11七电流反馈和转速反馈电路设计························127.1电流反馈电路设计·······································127.2转速反馈电路设计···············

6、·························13八结束语·················································13九参考文献···············································15十总电路图……………………………………………………161引言19直流电动机由于有着广泛的起制动性能，宜于在广泛范围内平滑调速，且直流拖动系统在理论上和实践上都比较成熟，因而目前应用广泛。直流电机在一定范围内无极平滑调速系统来说，以调节电枢电压的方式最好。直流PWM调速系统作为一种新技术，发

7、展迅速，应用日益广泛，特别在中、小容量的系统中，已取代V-M系统成为主要的直流调速方式。脉宽调速实质上是调压调速方式中的一种，它采用全控型电力电子器件组成的直流脉冲调制型的调速系统已发展成熟，用途越来越广，与传统的V-M系统相比，在很多方面有很大的优越性。双极式控制的桥式可逆PWM变换器有下列优点：（1）电流一定连续；（2）可使电机在四象限运行；（3）电机停止时有微振电流，能消除静摩擦死区；（4）低速平稳性好，系统的调速范围可达1:20000左右；（5）低速时，每个开关器件的驱动脉冲仍较宽，有利于保证器件的可靠导通。双极式控制方式的不足之处是：在工作过程中

8、，4个开关器件可能都处于开关状态，开关损耗大，而且在切换时可能发生