大功率水冷永磁涡流调速器的多场耦合研究
发布时间：2018-12-10 21:19
【摘要】：永磁调速器是集机械结构学、磁学、热力学、流体力学和材料科学于一体的最具代表性的机械设备,具有结构简单、节能环保、非接触动力传递、软启动及实现过载保护等特点,逐渐取代其他电力传动设备并具有广泛的应用前景,已成为国家节能重点推广产品。目前,对于永磁调速器的研究主要集中于其磁场、涡流场及温度场单场数值计算方面,并以此作为其结构优化设计的基础。对于大功率水冷永磁调速器,如果忽略了流场的影响、重要参数的温度变化及各物理场间的耦合关系,其计算结果与实测值误差较大,因此对大功率永磁调速器多场耦合的研究具有重要工程价值。本文首先利用Ansoft软件对大功率永磁调速器磁场进行有限元建模仿真,并利用Ansys Workbench软件搭建调速器磁-热z1合模型,即将磁场分析的涡流损耗作为热源导入稳态热场分析,最终得到导体筒外表面的热通量分布。然后,利用Fluent软件对永磁调速器进行二维流场仿真计算,对永磁调速器进行热-流双向耦合,并修正导体筒外表面对流散热系数。在通过热-流双向耦合对对流散热系数修正的基础上,搭建磁-热双向耦合模型,即设置导体转子电导率、热导率的温度变化曲线,形成永磁调速器磁-热-流多场耦合数值分析系统,最终得到调速器温度分布及转矩特性。并通过试验对永磁调速器的输出转矩和调速器水冷系统出口水温进行测量。试验结果表明,采用永磁调速器磁-热-流多耦合场有限元分析方法,能准确计算大功率调速器的运行特性与温度值。最后,依据磁-热-流耦合分析结果建立永磁调速器二维瞬态磁-热有限元模型,以托盘厚度、磁铁厚度、铜环厚度、导体筒厚度为约束条件,磁铁利用率最大及导体环温度最小为优化目标,采用响应面法建立优化模型,以遗传算法求出调速器的最优结构参数,为调速器的优化设计提供了一种新方法。
[Abstract]:Permanent magnet governor is the most representative mechanical equipment which integrates mechanical structure, magnetism, thermodynamics, hydrodynamics and material science. It has simple structure, energy saving and environmental protection, and non-contact power transfer. Soft start and overload protection gradually replace other electric power transmission equipment and have a wide application prospect. It has become a national energy saving key promotion products. At present, the research of permanent magnet governor is mainly focused on the numerical calculation of magnetic field, eddy current field and temperature field, which is the basis of its structural optimization design. For the high power water-cooled permanent magnet governor, if the influence of flow field is ignored, the temperature change of important parameters and the coupling relationship between physical fields are neglected, the error between the calculated results and the measured values is large. Therefore, the study of multi-field coupling of high-power permanent magnet governor has important engineering value. In this paper, the magnetic field of the high-power permanent magnet governor is modeled and simulated by Ansoft software, and the magnetic-hot z1 model of the governor is built by using the Ansys Workbench software. The eddy current loss of the magnetic field analysis is introduced into the steady-state thermal field analysis as a heat source. Finally, the heat flux distribution on the outer surface of the conductor tube is obtained. Then, the two-dimensional flow field simulation of the permanent magnet governor is carried out by using Fluent software, and the heat flow bidirectional coupling of the permanent magnet governor is carried out, and the convective heat transfer coefficient of the outer surface of the conductor tube is corrected. Based on the modification of convection heat dissipation coefficient by the thermal-flow bidirectional coupling, the magnetic-thermal bidirectional coupling model is built, that is, the temperature change curve of conductance and thermal conductivity of conductor rotor is set up. Finally, the temperature distribution and torque characteristics of the permanent magnet governor are obtained. The output torque of the permanent magnet governor and the water temperature at the outlet of the governor water cooling system are measured. The test results show that the finite element analysis method of magnetic-thermal-flow coupling field of permanent magnet governor can accurately calculate the operating characteristics and temperature value of high power governor. Finally, a two-dimensional transient magneto-thermal finite element model of permanent magnet governor is established according to the results of magnetic-thermal-flow coupling analysis. The thickness of pallet, magnet, copper ring and conductor tube are taken as constraint conditions. The maximum magnets utilization ratio and the minimum conductor ring temperature are the optimization objectives. The response surface method is used to establish the optimization model and the genetic algorithm is used to calculate the optimal structural parameters of the governor, which provides a new method for the optimal design of the governor.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH139
[Abstract]:Permanent magnet governor is the most representative mechanical equipment which integrates mechanical structure, magnetism, thermodynamics, hydrodynamics and material science. It has simple structure, energy saving and environmental protection, and non-contact power transfer. Soft start and overload protection gradually replace other electric power transmission equipment and have a wide application prospect. It has become a national energy saving key promotion products. At present, the research of permanent magnet governor is mainly focused on the numerical calculation of magnetic field, eddy current field and temperature field, which is the basis of its structural optimization design. For the high power water-cooled permanent magnet governor, if the influence of flow field is ignored, the temperature change of important parameters and the coupling relationship between physical fields are neglected, the error between the calculated results and the measured values is large. Therefore, the study of multi-field coupling of high-power permanent magnet governor has important engineering value. In this paper, the magnetic field of the high-power permanent magnet governor is modeled and simulated by Ansoft software, and the magnetic-hot z1 model of the governor is built by using the Ansys Workbench software. The eddy current loss of the magnetic field analysis is introduced into the steady-state thermal field analysis as a heat source. Finally, the heat flux distribution on the outer surface of the conductor tube is obtained. Then, the two-dimensional flow field simulation of the permanent magnet governor is carried out by using Fluent software, and the heat flow bidirectional coupling of the permanent magnet governor is carried out, and the convective heat transfer coefficient of the outer surface of the conductor tube is corrected. Based on the modification of convection heat dissipation coefficient by the thermal-flow bidirectional coupling, the magnetic-thermal bidirectional coupling model is built, that is, the temperature change curve of conductance and thermal conductivity of conductor rotor is set up. Finally, the temperature distribution and torque characteristics of the permanent magnet governor are obtained. The output torque of the permanent magnet governor and the water temperature at the outlet of the governor water cooling system are measured. The test results show that the finite element analysis method of magnetic-thermal-flow coupling field of permanent magnet governor can accurately calculate the operating characteristics and temperature value of high power governor. Finally, a two-dimensional transient magneto-thermal finite element model of permanent magnet governor is established according to the results of magnetic-thermal-flow coupling analysis. The thickness of pallet, magnet, copper ring and conductor tube are taken as constraint conditions. The maximum magnets utilization ratio and the minimum conductor ring temperature are the optimization objectives. The response surface method is used to establish the optimization model and the genetic algorithm is used to calculate the optimal structural parameters of the governor, which provides a new method for the optimal design of the governor.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH139
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