盘式异步磁力耦合器调速性能分析与智能调速系统研究

发布时间：2018-07-01 14:44

本文选题：盘式异步磁力耦合器 + 转矩表达式　；参考：《江苏大学》2017年硕士论文

【摘要】：盘式异步磁力耦合器是以电磁感应原理为工作基础的一种新型动力传递装置,实现了电机与负载之间的无接触式传动,且因具有隔振、无需高精度对中、轻载启动与过载保护等优点,而被广泛应用于机械工业、电力、冶金等各个行业。磁力耦合器可以在不同负载工况下通过改变气隙厚度实现调速功能,并在驱动离心式风机、泵类等变转矩负载时可实现调速节能效果,因此对于磁力耦合器的研究不仅在学术价值上意义重大,而且极具工程实用价值。本文对盘式异步磁力耦合器进行了如下几个方面的研究:(1)建立盘式异步磁力耦合器的转矩与调速关系的计算模型。利用等效磁路法与磁路的基尔霍夫定律建立磁力耦合器模型,通过对模型进行解析计算得出耦合器的磁路参数,再结合三维修正系数与转矩公式推导耦合器的最终转矩表达式。通过对不同负载进行分析,进一步推导磁力耦合器在恒转矩负载与变转矩负载下的调速关系式,并利用Matlab对调速关系式进行求解,得到耦合器调速关系的理论计算值。(2)建立盘式异步磁力耦合器三维有限元模型,并对其机械特性与调速特性进行了模拟分析。建立盘式异步磁力耦合器的三维有限元模型并阐述建模过程,模拟分析耦合器的机械特性与调速特性,获得耦合器机械特性曲线与调速特性曲线,并依据调速特性曲线分析耦合器的带负载能力、调速节能和启动性能,提出适合该磁力耦合器的变转矩负载系数,以及提高耦合器启动性能的方式。模拟分析耦合器在不同负载转矩下的调速关系,得到耦合器在调速过程中转差率随气隙厚度的变化规律,验证调速关系在理论计算上的正确性。(3)设计了盘式异步磁力耦合器智能调速系统的总体方案,并建立了智能调速系统的传递函数。提出盘式异步磁力耦合器智能调速系统的设计方案,建立智能调速系统的机械结构模型与控制系统框图;确定调速系统的运动方案,并对控制系统的硬件进行选取,设计硬件安装接线图;研究智能调速系统的机械结构与控制系统的传递函数,得到整个智能调速系统的传递函数,从而确定输入信号与气隙厚度之间的关系,并通过传递函数对智能调速系统的稳定性进行分析。(4)设计并研制盘式实心异步磁力耦合器样机,搭建调速性能测试平台,开展了磁力耦合器在恒转矩负载与变转矩负载下的调速关系、以及离心式风机的负载特性的试验测试。根据测试结果可知,耦合器的转差率随着气隙厚度的增大而加速增大,并确定了风机的变转矩负载系数。测试值与计算值、模拟值具有较好的一致性。
[Abstract]:The disk asynchronous magnetic coupler is a new type of power transmission device based on the principle of electromagnetic induction. It realizes the contactless transmission between the motor and the load, and because of its vibration isolation, it does not need high precision alignment. Light-load startup and overload protection are widely used in mechanical industry, electric power, metallurgy and other industries. The magnetic coupler can realize the speed regulation function by changing the thickness of the air gap under different load conditions, and can realize the speed regulation and energy saving effect when driving the centrifugal fan, pump and other variable torque loads. Therefore, the study of magnetic coupler is not only of great academic value, but also of great practical engineering value. In this paper, the following aspects of the disk asynchronous magnetic coupler are studied: (1) the calculation model of the relationship between the torque and the speed regulation of the disc asynchronous magnetic coupler is established. The magnetic coupler model is established by using the equivalent magnetic circuit method and Kirchhoff's law of the magnetic circuit. The magnetic circuit parameters of the coupler are calculated by analyzing the model, and the final torque expression of the coupler is derived by combining the three-dimensional correction coefficient and torque formula. Through the analysis of different loads, the relationship between the constant torque load and the variable torque load of the magnetic coupler is further deduced, and the formula is solved by Matlab. The theoretical calculation value of coupler speed regulation relationship is obtained. (2) the three-dimensional finite element model of disc asynchronous magnetic coupler is established and its mechanical and speed characteristics are simulated and analyzed. The 3D finite element model of disk asynchronous magnetic coupler is established and the modeling process is described. The mechanical characteristic curve and speed regulating characteristic curve of the coupler are obtained by simulating and analyzing the mechanical characteristics and speed regulating characteristics of the coupler. According to the characteristic curve of speed regulation, the load capacity of coupler, the energy saving and startup performance of coupler are analyzed, and the variable torque load coefficient suitable for the magnetic coupler is put forward, and the way to improve the starting performance of coupler is put forward. The relation of coupler speed regulation under different load torque is simulated and analyzed, and the variation law of coupler's slip rate with air gap thickness is obtained in the course of speed regulation. To verify the correctness of the speed regulation relationship in theoretical calculation. (3) the overall scheme of the disk asynchronous magnetic coupler intelligent speed regulation system is designed and the transfer function of the intelligent speed regulation system is established. The design scheme of intelligent speed regulating system of disk asynchronous magnetic coupler is put forward, the mechanical structure model and control system block diagram of intelligent speed regulating system are established, the motion scheme of speed regulating system is determined, and the hardware of the control system is selected. Design the hardware installation wiring diagram, study the mechanical structure of the intelligent speed regulation system and the transfer function of the control system, get the transfer function of the whole intelligent speed regulation system, and determine the relationship between the input signal and the thickness of the air gap. The stability of the intelligent speed regulating system is analyzed by transfer function. (4) the disk solid asynchronous magnetic coupler prototype is designed and developed, and the testing platform of speed regulation performance is built. The relationship between the constant torque load and the variable torque load of the magnetic coupler and the test of the load characteristics of the centrifugal fan are carried out. According to the test results, the slip rate of the coupler increases with the increase of the air gap thickness, and the variable torque load coefficient of the fan is determined. The test value is in good agreement with the calculated value.
【学位授予单位】：江苏大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH139

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