晶闸管不可逆直流调速系统主电路设计.doc

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综合课程设计
设计报告

晶闸管不可逆直流调速系统主电路设计

院（系、部）：信息工程学院姓名：学号：年级：专业：任课教师：

2014年1月12日·北京
目录
1.设计任务··························································4
2.设计内容··························································4
3.调速系统的方案选择················································4
3.1直流电动机的选择··············································4
3.2电动机供电方案的选择··········································4
4.主电路计算·······················································6
4.1整流变压器的计算·············································6
4.1.1二次侧相电压U2的计算··································6
4.1.2一、二次侧相电流和的计算·························7
4.1.3一、二次侧变压器容量的计算····························7
4.2.晶闸管元件的选择············································7
4.2.1晶闸管额定电压···································7
4.2.2晶闸管额定电流···································7
4.3.晶闸管保护环节的计算·······································8
4.3.1过电压保护·········································8
4.3.1.1交流侧过电压保护····························8
4.3.1.2直流侧过电压保护···························10
4.3.1.3晶闸管两端的过电压保护·····················10
4.3.2过电流保护········································11
4.3.2.1交流侧快速熔断器的选择·····················11
4.3.2.2元件端快速熔断器的选择····················12
4.3.2.3直流侧快速熔断器的选择····················13
4.4.电抗器参数的计算·········································13
4.4.1使输出电流连续的临界电感量··················14
4.4.2限制输出电流脉动的电感······················14
4.4.3变压器漏电感量······························14
4.4.4实际串入电抗器的电感···························15

5.设计体会···················································15
6.参考文献···················································16附录1：主要元器件型号规格··································17
附录2：晶闸管不可逆直流调速系统主电路图····················18

1.设计任务
设计一个晶闸管不可逆直流调速系统的主电路。
直流电机：额定功率,额定电压,额定电流,额定转速，极数，电枢电阻，电枢电感＝1ｍH，电网电压。
２.设计内容
1）电动机的选择
2）整流变压器的计算
3）晶闸管元件的选择
4）晶闸管保护元件的计算
5）电抗器参数的计算
3.调速系统的方案选择
3.1直流电动机的选择
根据负载和额定转速的要求，查《电工手册》（第四册）依据原则及过载要求，选取：
型号：Z3-52
额定功率：7.5KW
额定电压：110V
额定电流：82A
额定转速：1500r/min
极数：2P=4
电枢回路电阻