【摘要】：高速、高精度加工作為現(xiàn)代制造技術(shù)的主要發(fā)展方向,對(duì)數(shù)控機(jī)床的傳動(dòng)和控制有很高的要求。直線電機(jī)以“零傳動(dòng)”的方式克服了傳統(tǒng)進(jìn)給系統(tǒng)的缺點(diǎn),滿足現(xiàn)代制造業(yè)對(duì)數(shù)控機(jī)床的高速高精密加工的要求,但其直接驅(qū)動(dòng)的方式也加大了控制上的難度。本文以高速數(shù)控機(jī)床的直線電機(jī)進(jìn)給系統(tǒng)為研究對(duì)象,針對(duì)永磁直線同步電機(jī)直接驅(qū)動(dòng)的特點(diǎn),將模糊控制與其它控制策略相結(jié)合,設(shè)計(jì)了永磁直線同步電機(jī)模糊控制系統(tǒng),并在此基礎(chǔ)上,引入變論域模糊控制思想,對(duì)伺服系統(tǒng)作了進(jìn)一步的改進(jìn)。本文主要的研究工作如下:1、研究永磁直線同步電機(jī)的工作原理,建立了永磁直線同步電機(jī)在dq坐標(biāo)下的數(shù)學(xué)模型,將磁場(chǎng)定向0di?矢量控制技術(shù)與PID控制相結(jié)合,建立了永磁直線同步電機(jī)伺服控制系統(tǒng)模型,分析了傳統(tǒng)控制方法的優(yōu)點(diǎn)和缺點(diǎn),為進(jìn)一步的研究工作提供了依據(jù)。2、永磁直線同步電機(jī)具有非線性、時(shí)變性和強(qiáng)耦合性等特點(diǎn),采用傳統(tǒng)控制方法難以獲得良好的控制效果。本文利用模糊控制系統(tǒng)的萬能逼近特性,將其與0du?控制(直接電壓控制)方法相結(jié)合,建立了永磁直線同步電機(jī)的模糊控制系統(tǒng)模型。與PID控制相比,伺服系統(tǒng)模型得到了簡化,它不僅能夠?qū)崿F(xiàn)對(duì)速度的快速跟蹤控制,而且擁有良好的抗干擾能力和魯棒性能。3、由于模糊控制存在控制精度低、穩(wěn)態(tài)誤差大等問題,通過引入變論域模糊控制思想,可以實(shí)現(xiàn)在不改變模糊控制規(guī)則的基礎(chǔ)上,提高系統(tǒng)的控制精度。為了保證伺服系統(tǒng)模型盡量的簡單,采用了單輸入單輸出的模糊控制器來獲取模糊控制器的輸入論域伸縮因子,并且不對(duì)輸出論域進(jìn)行變換。由于采用0du?控制方式,系統(tǒng)缺少勵(lì)磁電流的控制環(huán)節(jié),通過引入0di?控制方法,對(duì)伺服系統(tǒng)模型進(jìn)行了改進(jìn),以此實(shí)現(xiàn)了高精度的速度控制以及對(duì)勵(lì)磁電流和推力電流的解耦控制。仿真結(jié)果表明,所設(shè)計(jì)的變論域模糊控制系統(tǒng)具有很強(qiáng)的自適應(yīng)能力和魯棒性。
[Abstract]:As the main developing direction of modern manufacturing technology, high speed and high precision machining requires the drive and control of NC machine tools. Linear motor overcomes the shortcoming of traditional feed system by "zero drive" and meets the requirement of high speed and high precision machining of NC machine tool in modern manufacturing industry, but its direct driving mode also increases the difficulty of control. In this paper, the linear motor feed system of high speed NC machine tool is taken as the research object. According to the characteristics of the direct drive of the permanent magnet linear synchronous motor, the fuzzy control system of the permanent magnet linear synchronous motor is designed by combining fuzzy control with other control strategies. On this basis, the idea of variable theory domain fuzzy control is introduced to further improve the servo system. The main research work of this paper is as follows: 1. The working principle of permanent magnet linear synchronous motor is studied, and the mathematical model of permanent magnet linear synchronous motor under dq coordinate is established. Combining vector control technology with pid control, the servo control system model of permanent magnet linear synchronous motor is established, and the advantages and disadvantages of traditional control methods are analyzed. It provides the basis for further research. The permanent magnet linear synchronous motor (PMLSM) has the characteristics of nonlinear, time-varying and strong coupling, so it is difficult to obtain good control effect by using the traditional control method. In this paper, the universal approximation property of fuzzy control system is used, and the fuzzy control system is compared with the universal approximation property of the fuzzy control system. The fuzzy control system model of permanent magnet linear synchronous motor (PMLSM) is established by combining the direct voltage control (DVC) method. Compared with pid control, the servo system model is simplified. It can not only realize the fast tracking control of speed, but also has good anti-jamming ability and robust performance. By introducing the idea of variable universe fuzzy control, the control precision of the system can be improved without changing the fuzzy control rules. In order to keep the servo system model as simple as possible, a single input and single output fuzzy controller is used to obtain the input domain expansion factor of the fuzzy controller, and the output domain is not transformed. Due to the adoption of 0du? Control mode, the system lacks excitation current control link, through the introduction of 0dii? The model of servo system is improved to realize high precision speed control and decoupling control of excitation current and thrust current. The simulation results show that the proposed variable domain fuzzy control system has strong adaptive ability and robustness.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM359.4

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本文編號(hào)：2131462