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新型电气传动理论在电铲控制系统上的应用
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摘要
本文主要论述了新型电气传动理论在电铲控制系统上的应用。该系统应用全数字化直流驱动装置取代传统电铲的交流原动机一直流发电机组,针对挖掘机野外作业存在粉尘、高温、潮湿等问题,采用全数字化直流调速装置和可编程控制器组合开发的具有当代世界先进水平的智能PLC控制技术,提高了调速性能,能够在很宽的范围内高精度的调速和控制,采取一些模拟电路难以实现的控制规律和控制方法。例如,电流自适应控制、自学习最优控制等。用控制算法软件取代原有的硬件控制设备,所有的控制和操作信号进可编程控制器(PLC)以减少中间环节从而提高了抗干扰能力,改善了电铲的电气性能和现场的作业环境,显著降低了故障率,提高了设备使用效率。
     本文针对全数字直流调速器回路、应用自适应原理,通过数学推导,得出了速度环、电枢电压环、电枢电流环的数学模型。根据全数字化电铲的工作原理,以及它的控制方式要求,在电流环内引入电流自适应调节,参数进行自学习最优控制。
     论文主要由五部分组成:第一部分为概述,讲述了电铲存在的问题以及电气传动技术的理论基础。第二部分介绍了自适应原理中的连续与离散系统模型参考、稳定性理论以及在直流电传动上的应用。第三部分为新系统配置的控制原理及智能PID控制。第四部分讲述了新系统的具体操作与实现。第五部分为系统的参数操作及软件组成。通过全文的论述,进一步阐述了智能电气传动技术在控制领域上的应用。
The dissertation mostly discourses upon the theories of the new-type electric transmission in the application of the control stystem for excavators. This system uses the total digital direct current drivers to replace the former AC-DC dynamo of the excavator. According to the problem of the powder dirt, the high temperature and the aquosity being the open country busywork, adopt the combination of the total digital DC timing and the programmable controller to tap the intelligent PLC control technology of the contemporary advanced level, and boost the timing capability in a position to the high precise timing and control in very wide extension, and take some control rules and measures which are difficult to come true by the analogy circuit, such as the electrical current self-adaptive control, the self-study optimizing control and so on. Using the software of the control arithmetic replaces the inner hardware. By all the signal of the control and manipulation entering the PLC to reduce the interspace tache, enhance the anti-jamming ability, improve the electric performance and the spot entironment, great reduce the failure rate and improve the efficiency of using equipments.According to the loops of the total digital DC timing and applied self-adaptive principles, deduce the mathematic model of the speed, armature voltage and armature electrical current loops. In terms of the excavator principles of its control mode introducing the electrical current self-adaptive control, the parameters are carried through the self- study optimal control systems.The dissertation is consisted of the five parts: the first part is the summary, which narrates the defect of the former excavator control system and the basic theories of the electric transmission. The second part introduces the continous and discrete systemic model references and the stability theories. The third part is the new systemic collocating theories and intelligent PID control. The fourth part narrates the embodying operation and the realization of the new systemic collocating. The fifth part is the operation of the parameters and the buildup of the software. By the demonstration of the total dissertation, we expounded the intelligent electric transmission in the applications of the control fields.
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