自动化专业英语第三章46623.pptx
《自动化专业英语第三章46623.pptx》由会员分享,可在线阅读,更多相关《自动化专业英语第三章46623.pptx(38页珍藏版)》请在淘文阁 - 分享文档赚钱的网站上搜索。
1、3.1Text1.Ohms2.Potential3.Power1.OhmsFig.1.3.1A complex branch circuit2.PotentialFig.1.3.2A single loop circuit2.PotentialFig.1.3.3A potentia-distribution diagram3.PowerFig.1.3.4Power relations3.PowerFig.1.3.5Equivalentcircuit of Fig.1.3.43.1Text1)That only the first harmonic of the variables(voltag
2、es,currents,etc.)are taken into account since they embrace and determine the main group of processes occurring in an induction machine;2)Consider the processes occurring in the rotor with the latter running at any speed irrespective of the cause which makes the rotor run,in order to make the analysi
3、s as generalized as possible.1.Frequency2.Rotor3.Rotor3.Rotor(1)mmf equationSince in an induction machine the stator and rotor mmfs F1 and F2 both rotate in space with the same speed and in the same direction,it may be assumed that they are stationary in respect to each other and,consequently,create
4、 a common rotating sine wave of mmf Fm.【9】The mmf sine wave in this case must be shifted in space in respect to the mmf F1 by an angle that makes the resultant mmf Fm sufficient for setting up the emf equilibrium of the main magnetic flux m necessary according to the conditions.3.Rotor(2)Vector diag
5、rams of an induction machine as a particular case of a transformerThe mutual induction flux m is defined by the value of the magnetizing current Im which is equal to the vector sum of the current 1 and the referred current.Neglecting the losses in the steel,it may be assumed that the flux=m is phase
6、 with the current m.Let us introduce into the discussion the fictitious fluxes 1 and 2 coinciding in phase with the currents 1 and 2 and proportional to these currents so that3.1Text1.Data2.Pencil3.Strip4.Scanning5.PC6.Data7.Data8.Conclusion9.Glossary3.1Text1.Abstract2.Introduction3.System4.Motor3.1
7、Text1.Word2.Electronic1.Word(1)Electronic text captureAs text is entered on the keyboard,the program stores the characters in memory and displays,or echoes,them on the video display screen.The cursor,an underline or black character appearing on the screen,indicates the current typing position on the
8、 line.If a word contains more characters than can fit within the right margin,the entire word automatically is“wrapped around”in the screen and placed at the beginning of the next line.This word wrap feature allows the user to enter text continuously,uninterrupted by either line feeds or carriage re
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 自动化 专业 英语 第三 46623
限制150内