1、合肥学院机械工程系毕业设计（论文）文件 合 肥 学 院 机 械 工 程 系 毕业设计 (论文 ) 外 文 翻 译 文献 题目： The Design of the Vector Control System of Asynchronous Motor 专业 ： 机械设计制造及其自动化 年级 ： 09 级 姓名 ： 张支亮 学号 ： 0906013014 指导教师 ： 夏小虎 职称 ： 副教授 2013 年 4 月 20 日 1 The Design of the Vector Control System of Asynchronous Motor Min Zhang, Xinping Din
2、g & Zhen Guo College of Automation, Qingdao Technological University, Qingdao 266033, China E-mail: z_ Abstract: Among various modes of the asynchronous motor speed control, vector control has the advantages of fast response, stability, transmission of high-performance and wide speed range. For the
3、need of the asynchronous motor speed control, the design uses 89C196 as the controller, and introduces the designs of hardware and software in details. The Design is completed effectively, with good performance simple structure and good prospects of development. Keywords: Asynchronous motor, 89C196,
4、 Vector control 1. Introduction AC asynchronous motor is a higher order, multi-variable, non-linear, and strong coupling object, using the concept of parameters reconstruction and state reconstruction of modern control theory to achieve decoupling between the excitation component of the AC motor sta
5、tor current and the torque component, and the control process of AC motor is equivalent to the control process of DC motor, the dynamic performance of AC speed regulation system obtaining notable improvement, thus makes DC speed replacing AC speed possible finally. The current governor of the higher
6、 production process has been more use of Frequency Control devices with vector-control. 2. Vector Control With the criterion of producing consistent rotating magneto motive force, the stator AC current Ai , Bi , Ci by3S/2S conversion in the three-phase coordinate system, can be equivalent to AC curr
7、ent sdi ， sqi， in two-phase static coordinate system, through vector rotation transformation of the re-orientation of the rotor magnetic field, Equivalent to a synchronous rotation coordinates of the DC current edi ， eqi. When observers at core coordinates with the rotation together, AC machine beco
8、mes DC machine. Of these, the AC induction motor rotor total flux r , it has become the equivalent of the DC motor flux, windings ed equivalent to the excitation windings of DC motor , 2 edi equivalent to the excitation current, windings eq equivalent to false static windings, eqi equivalent to the
9、armature current proportional to torque. After the transformation above, AC asynchronous motor has been equivalent to DC motor. As a result, imitating the control method of DC motor, obtaining the control variable of DC motor, through the corresponding coordinates anti-transformation, can control th
10、e asynchronous motor. As a result of coordinate transformation of the current (on behalf of magnetic momentum) space vector, thus, this control system achieved through coordinate transformation called the vector control system, referred to VC system. According to this idea, could constitute the vect
11、or control system that can control r and eqi directly, as shown in Figure 1. In the figure a given and feedback signal through the controller similar to the controller that DC speed control system has used, producing given signal *eqsiof the excitation current and given signal *edsi of the armature
12、current, after the anti-rotation transform VR-1 obtaining *eqsi and *edsi , obtains *Ai , *Bi , *Ci by 3S/2S conversion. Adding the three signals controlled by current and frequency signal 1 obtained by controller to the inverter controlled by current, can output three-phase frequency conversion cur
13、rent that asynchronous motor needs for speed. 3. The Content and Thought of the Design This system uses 80C196 as controller, consists of detection unit of stator three-phase current unit of keyboard input, LCD display modules, given unit of simulation speed detection unit of stator three-phase volt
14、age, feedback unit of speed and output unit of control signals. System block diagram shown in Figure 2, the system applies 16 bits MCU 80C196 as control core, with some hardware analog circuits composing the vector control system of asynchronous motor. On the one hand, 80C196 through the A/D module
15、of 80C196, speed gun and the given speed feedback signals has been obtained, obtaining given torque of saturated limiting through speed regulator, to obtain the given torque current； Use a given function generator to obtain given rotor flux, through observation obtaining real flux, through flux regulation obtaining given excitation current of given stator current, then the excitation current and the torque current synthesis through the K/P transformation, obtaining amplitude and phase stator current, after amplitude of stator current
