变论域模糊控制在直线电机控制系统中的应用研究
发布时间：2018-07-18 09:20
【摘要】：高速、高精度加工作为现代制造技术的主要发展方向,对数控机床的传动和控制有很高的要求。直线电机以“零传动”的方式克服了传统进给系统的缺点,满足现代制造业对数控机床的高速高精密加工的要求,但其直接驱动的方式也加大了控制上的难度。本文以高速数控机床的直线电机进给系统为研究对象,针对永磁直线同步电机直接驱动的特点,将模糊控制与其它控制策略相结合,设计了永磁直线同步电机模糊控制系统,并在此基础上,引入变论域模糊控制思想,对伺服系统作了进一步的改进。本文主要的研究工作如下:1、研究永磁直线同步电机的工作原理,建立了永磁直线同步电机在dq坐标下的数学模型,将磁场定向0di?矢量控制技术与PID控制相结合,建立了永磁直线同步电机伺服控制系统模型,分析了传统控制方法的优点和缺点,为进一步的研究工作提供了依据。2、永磁直线同步电机具有非线性、时变性和强耦合性等特点,采用传统控制方法难以获得良好的控制效果。本文利用模糊控制系统的万能逼近特性,将其与0du?控制(直接电压控制)方法相结合,建立了永磁直线同步电机的模糊控制系统模型。与PID控制相比,伺服系统模型得到了简化,它不仅能够实现对速度的快速跟踪控制,而且拥有良好的抗干扰能力和鲁棒性能。3、由于模糊控制存在控制精度低、稳态误差大等问题,通过引入变论域模糊控制思想,可以实现在不改变模糊控制规则的基础上,提高系统的控制精度。为了保证伺服系统模型尽量的简单,采用了单输入单输出的模糊控制器来获取模糊控制器的输入论域伸缩因子,并且不对输出论域进行变换。由于采用0du?控制方式,系统缺少励磁电流的控制环节,通过引入0di?控制方法,对伺服系统模型进行了改进,以此实现了高精度的速度控制以及对励磁电流和推力电流的解耦控制。仿真结果表明,所设计的变论域模糊控制系统具有很强的自适应能力和鲁棒性。
[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.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM359.4
本文编号：2131462
[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.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM359.4
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