电气工程及其自动化专业英语

电气工程及其自动化专业英语 感应电机 学院：电子信息工程 学号： 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 composed 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 unified 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 torque 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 reasonable. 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 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 field, 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 electromagnetic 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 winding 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, 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 magnetic 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 noise, 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 electrical 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 will be smaller along the induction motor, the electromechanical energy conversion efficiency is higher, more flexible control of the direction for further development. 感应电机感应电动机，又称“异步电动机”，即转子置于旋转磁场中，在旋转磁场的作用下，获得一个转动力矩，因而转子转动。感应电机主要有静止的定子和转动的转子两大部分组成，定，转子之间有一很小的空气间隙，由电气工程师拉特斯拉于1887年发明。新中国成立以前，我国的电机工业非常落后，新中国成立之后，对感应电机进行了多次统一设计。1953年参照前苏联的A,AO系列设计了J,JO电机，1961年全国统一设计了J2，JQ2系列，采用了E级绝缘，提高了性能，减小了体积和重量。1971年起，设计了JQ3系列电机，启动转矩提高了4.5%。1979年开始，组织了Y系列电机的统一设计，采用B级绝缘，性能良好，运行可靠。20世纪90年代，设计了Y2系列电机，提高了防护等级和绝缘等级，降低了噪声，结构更为合理。由于感应电机在各行各业的应用越来越广泛，自然我们就要对感应电机的给工作原理非常熟悉，当对感应电机中的三相绕组通入三相电流时，在电机气隙内产生一个转速为n=60f/p的旋转磁场，该磁场切割转子导体，在转子导体内产生感应电动势。若转子导体内将流过与电动势同相位的电流，载流在磁场中受力，从而产生电磁转矩，使转子沿着磁场方向旋转。若在转子轴上加机械负载，电动机就拖动负载旋转，此时电机从电源吸收电能，通过电磁感应转换为轴上输出的机械能，这就是感应电机的基本原理。感应电机在地铁中也发挥了至关重要的作用，其在地铁上的运行状态为：由感应电机的三相绕组及叠片铁心构成的电磁感应装置的一次侧安装在车体上,主要由铁板及铝板构成的被称为反作用板的电磁感应装置的二次侧铺设在两根轨道之间。当一次侧的三相绕组被加上交流电压时,一次侧就会产生移动的磁场,从而发生电磁感应并产生磁场，而在二次侧的反作用板上将感应产生涡流。磁场与电流的相互作用产生沿磁场移动方向的推力,车辆就是被这一推力驱动的。推力的