三相异步电动机点动和自锁控制系统的设计 下载本文

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大 庆 师 范 学 院

课 程 设 计

课 程 电机与拖动课程设计 题 目 三相异步电动机点动和自锁控制系统的设计 院 系 物理与电气信息工程学院 专业班级 2008级电子信息工程(自动化)一班 学生姓名 姬红富 学生学号 200801071463 指导教师

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目 录

1.设计要求 ······································································· 错误!未定义书签。 2.方案设计 ······································································· 错误!未定义书签。

2.1常见的信号源制作方法 ············································· 错误!未定义书签。 2.2方案论证 ······························································· 错误!未定义书签。 3.单元电路设计、参数计算和器件选择 ··································· 错误!未定义书签。

3.1单元电路设计 ························································· 错误!未定义书签。 3.2参数计算 ······························································· 错误!未定义书签。 3.3 器件选择 ······························································ 错误!未定义书签。 4.电路的工作原理 ······························································ 错误!未定义书签。 5.总结 ············································································· 错误!未定义书签。 6.系统需要的元器件清单 ····················································· 错误!未定义书签。 参考文献 ·········································································· 错误!未定义书签。

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点动控制

合上开关S,三相电源被吸引控制电路,但

电动机还不能启动。按下按钮SB,接触器KM线圈通电,衔铁吸合,常开主触点接通,电动机定子接入三相电源起动运转。松开按钮SB,接触器KM线圈断电,衔铁松开,常开主触点断开,电动机因断电而停转。出师表

两汉:诸葛亮

先帝创业未半而中道崩殂,今天下三分,益州疲弊,此诚危急存亡之秋也。然侍卫之臣不懈于内,忠志之士忘身于外者,盖追先帝之殊遇,欲报之于陛下也。诚宜开张圣听,以光先帝遗德,恢弘志士之气,不宜妄自菲薄,引喻失义,以塞忠谏之路也。

宫中府中,俱为一体;陟罚臧否,不宜异同。若有作奸犯科及为忠善者,宜付有司论其刑赏,以昭陛下平明之理;不宜偏私,使内外异法也。

侍中、侍郎郭攸之、费祎、董允等,此皆良实,志虑忠纯,是以先帝简拔以遗陛下:愚以为宫中之事,事无大小,悉以咨之,然后施行,必能裨补阙漏,有所广益。

将军向宠,性行淑均,晓畅军事,试用于昔日,先帝称之曰“能”,是以众议举宠为督:愚以为营中之事,悉以咨之,必能使行阵和睦,优劣得所。

亲贤臣,远小人,此先汉所以兴隆也;亲小人,远贤臣,此后汉所以倾颓也。先帝在时,每与臣论此事,未尝不叹息痛恨于桓、灵也。侍中、尚书、长史、参军,此悉贞良死节之臣,愿陛下亲之、信之,则汉室之隆,可计日而待也

臣本布衣,躬耕于南阳,苟全性命于乱世,不求闻达于诸侯。先帝不以臣卑鄙,猥自枉屈,三顾臣于草庐之中,咨臣以当世之事,由是感激,遂许先帝以驱驰。后值倾覆,受任于败军之际,奉命于危难之间,尔来二十有一年矣。

先帝知臣谨慎,故临崩寄臣以大事也。受命以来,夙夜忧叹,恐托付不效,以伤先帝之明;故五月渡泸,深入不毛。今南方已定,兵甲已足,当奖率三军,北定中原,庶竭驽钝,攘除奸凶,兴复汉室,还于旧都。此臣所以报先帝而忠陛下之职分也。至于斟酌损益,进尽忠言,则攸之、祎、允之任也。

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