電氣工程及其自動(dòng)化專(zhuān)業(yè)英語(yǔ)(共5頁(yè))

1、精選優(yōu)質(zhì)文檔-傾情為你奉上電氣工程及其自動(dòng)化專(zhuān)業(yè)英語(yǔ) 感應(yīng)電機(jī) 學(xué)院：電子信息工程 學(xué)號(hào)： 姓名：汪姣姣Induction motor Induction motor, also called as asynchronous motor, that is, the rotor in a rotating magnetic field, play the role of the rotating magnetic field to get a rotational force and thus the rotor rotation. Induction motor is mainly compo

2、sed of two important parts, stationary stator and rotor, there is a very small air gap in them, by the electrical engineer Nicola Tesla invented in 1887. Before the founding of new China, Chinas motor industry is very backward, after the founding of new China, the induction motor for a number of uni

3、fied design. 1953 referring to the former Soviet Unions AO, A series designed the J, JO motor, in 1961 the national unified design of the J2, JQ2 series, the use of E insulation, improve the performance, reduce the volume and weight. Since 1971, the design of the JQ3 series motor, the starting torqu

4、e increased by 4.5%. Starting in 1979, the organization of the Y series of motor design, the use of B insulation, good performance, reliable operation. In 1990s, the Y2 series motor is designed, which improves the protection and insulation level, reduces the noise and the structure is more reasonabl

5、e. Because of the induction motor is applied in all walks of life more and more widely, it is natural for us to of induction motor to work principle are very familiar with, when the windings of three-phase induction motor pass into the three-phase current, in the motor air gap produces a rotational

6、speed for n=60f/p rotating magnetic field, the magnetic field cutting rotor conductors. In the rotor conductor produces induced electromotive force. If the current in the rotor conductor flows in the same phase with the electromotive force, the current carrier is subjected to force in the magnetic f

7、ield, thereby generating an electromagnetic torque, which causes the rotor to rotate along the direction of the magnetic field. If the rotor shaft with mechanical load, the motor will drag the load rotation, at this time the motor from the power to absorb the power, through the induction of electrom

8、agnetic conversion to the output of the mechanical energy, which is the basic principle of induction motor. Induction motor in the subway also play a vital role, its running state in the subway is the first side of the electromagnetic induction device is composed of a three-phase induction motor win

9、ding and laminated core installation on the vehicle body, is mainly composed of iron and aluminum called the secondary side of the reverse effect on the board of the electromagnetic induction device between the two rails laying. When a side of the three-phase winding is coupled with the AC voltage,

10、a side will generate a moving magnetic field, resulting in electromagnetic induction and magnetic field, and in the two side of the reaction board will induce eddy currents. The interaction between the magnetic field and the electric current produces the thrust force along the direction of the magne

11、tic field, and the vehicle is driven by the force. Thrust control by VVVF inverter to achieve. So that the subway can run. In recent years, China has completed the design of the Y3 series, Y3 series induction motor using cold-rolled silicon steel sheet has the advantages of high efficiency, low nois

12、e, the advantages of good starting performance. And with the development of power electronic technology, semiconductor technology of AC AC speed control system to realize communication technology. After 100 years of technology development, motor theory basic mature, with the development of electrica

13、l engineering, to electrical energy conversion, control and efficient use of the increasingly high demand, continuously improve the performance of electromagnetic materials, electrical and electronic technology is widely used, for the development of induction motor injected new vitality. The future

14、will be smaller along the induction motor, the electromechanical energy conversion efficiency is higher, more flexible control of the direction for further development. 感應(yīng)電機(jī)感應(yīng)電動(dòng)機(jī)，又稱(chēng)“異步電動(dòng)機(jī)”，即轉(zhuǎn)子置于旋轉(zhuǎn)磁場(chǎng)中，在旋轉(zhuǎn)磁場(chǎng)的作用下，獲得一個(gè)轉(zhuǎn)動(dòng)力矩，因而轉(zhuǎn)子轉(zhuǎn)動(dòng)。感應(yīng)電機(jī)主要有靜止的定子和轉(zhuǎn)動(dòng)的轉(zhuǎn)子兩大部分組成，定，轉(zhuǎn)子之間有一很小的空氣間隙，由電氣工程師拉特斯拉于1887年發(fā)明。新中國(guó)成立以前，我國(guó)的電機(jī)工

15、業(yè)非常落后，新中國(guó)成立之后，對(duì)感應(yīng)電機(jī)進(jìn)行了多次統(tǒng)一設(shè)計(jì)。1953年參照前蘇聯(lián)的A,AO系列設(shè)計(jì)了J,JO電機(jī)，1961年全國(guó)統(tǒng)一設(shè)計(jì)了J2，JQ2系列，采用了E級(jí)絕緣，提高了性能，減小了體積和重量。1971年起，設(shè)計(jì)了JQ3系列電機(jī)，啟動(dòng)轉(zhuǎn)矩提高了4.5%。1979年開(kāi)始，組織了Y系列電機(jī)的統(tǒng)一設(shè)計(jì)，采用B級(jí)絕緣，性能良好，運(yùn)行可靠。20世紀(jì)90年代，設(shè)計(jì)了Y2系列電機(jī)，提高了防護(hù)等級(jí)和絕緣等級(jí)，降低了噪聲，結(jié)構(gòu)更為合理。由于感應(yīng)電機(jī)在各行各業(yè)的應(yīng)用越來(lái)越廣泛，自然我們就要對(duì)感應(yīng)電機(jī)的給工作原理非常熟悉，當(dāng)對(duì)感應(yīng)電機(jī)中的三相繞組通入三相電流時(shí)，在電機(jī)氣隙內(nèi)產(chǎn)生一個(gè)轉(zhuǎn)速為n=60f/p的旋轉(zhuǎn)磁

16、場(chǎng)，該磁場(chǎng)切割轉(zhuǎn)子導(dǎo)體，在轉(zhuǎn)子導(dǎo)體內(nèi)產(chǎn)生感應(yīng)電動(dòng)勢(shì)。若轉(zhuǎn)子導(dǎo)體內(nèi)將流過(guò)與電動(dòng)勢(shì)同相位的電流，載流在磁場(chǎng)中受力，從而產(chǎn)生電磁轉(zhuǎn)矩，使轉(zhuǎn)子沿著磁場(chǎng)方向旋轉(zhuǎn)。若在轉(zhuǎn)子軸上加機(jī)械負(fù)載，電動(dòng)機(jī)就拖動(dòng)負(fù)載旋轉(zhuǎn)，此時(shí)電機(jī)從電源吸收電能，通過(guò)電磁感應(yīng)轉(zhuǎn)換為軸上輸出的機(jī)械能，這就是感應(yīng)電機(jī)的基本原理。感應(yīng)電機(jī)在地鐵中也發(fā)揮了至關(guān)重要的作用，其在地鐵上的運(yùn)行狀態(tài)為：由感應(yīng)電機(jī)的三相繞組及疊片鐵心構(gòu)成的電磁感應(yīng)裝置的一次側(cè)安裝在車(chē)體上,主要由鐵板及鋁板構(gòu)成的被稱(chēng)為反作用板的電磁感應(yīng)裝置的二次側(cè)鋪設(shè)在兩根軌道之間。當(dāng)一次側(cè)的三相繞組被加上交流電壓時(shí),一次側(cè)就會(huì)產(chǎn)生移動(dòng)的磁場(chǎng),從而發(fā)生電磁感應(yīng)并產(chǎn)生磁場(chǎng)，而在二次側(cè)的反作用板上將感應(yīng)產(chǎn)生渦流。磁場(chǎng)與電流的相互作用產(chǎn)生沿磁場(chǎng)移動(dòng)方向的推力,車(chē)輛就是被這一推力驅(qū)動(dòng)的。推力的控制靠VVVF