固定式油冷电磁轧机电感器的热状态分析

V. Milykh, V. Р. Shaida, O. Yurieva
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引用次数: 1

摘要

介绍。本文研究了一种以三相感应电动机定子为基础,用于加工各种物质的电磁磨。定子绕组的电流密度增加,因此磨机采用变压器油强制冷却系统。问题。在给定设计和油冷条件下,目前还没有关于电磁机热态计算的研究。因此,对电磁机械热态的研究具有重要意义,有助于提高电磁机械工作的可靠性和效率。的目标。建立了电磁式磨机电感器热状态的数学模型,分析了电磁式磨机电感器在变压器油冷却的静态工况下的发热情况。方法。采用等效热阻电路法解决了电磁磨机主要部件的热状态即温度分布的计算问题。提供了足够完整的EMM设计,并在此基础上形成了相应的等效热替换回路,并辅以油道等效液压回路。解释了用EMM的组成元素来描述温度分布的方程组的组成和代数系统的解。结果。电磁磨机的热计算结果表明,所选绝缘等级的最高加热温度远低于其允许温度。根据液压方案,确定了所需的油耗、其平均转速及相应的进气管入口压力,均处于可接受的水平。值得注意的是,电感器相当温和的温度状态和油路的水力参数是由EMM设计中的创新所促进的,例如环路双层短弦绕组和定子铁心的轴向通风通道。创意。目前只提出了带风冷的EMM热等效电路。因此,所开发的油冷式电感器热回路是一种新颖的热回路,为评价电磁力机的工作模式提供了可能。实用价值。建议的技术解决方案可建议在其他机电管理系统中实际实施。考虑到EMM温度状态的确定储量,对其从油冷却过渡到空气冷却进行了预测。但是使用空气冷却需要改变EMM的设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of the thermal state of the electromagnetic mill inductor with oil cooling in stationary operation modes
Introduction. An electromagnetic mill (EMM) for the technological processing of various substances, which is based on the stator of a three-phase induction motor, is being studied. The stator winding has an increased current density, so the mill is provided with a system of forced cooling with transformer oil. Problem. Currently, there are no works on the thermal state calculation of the EMM with the given design and oil cooling. Therefore, the study of such EMMs thermal state is relevant, as it will contribute to increasing the reliability and efficiency of their work. Goal. Formation of a mathematical model of the thermal state of the electromagnetic mill inductor and the analysis of its heating in stationary modes of operation with cooling by transformer oil. Methodology. The problem of calculating the thermal state, namely the temperature distribution in the main parts of the electromagnetic mill, is solved by the equivalent thermal resistance circuit method. The design of the EMM is provided in a sufficiently complete volume, and on this basis, a corresponding equivalent thermal replacement circuit is formed, which is supplemented by an equivalent hydraulic circuit of oil passageways. An explanation is provided for the composition and solution of the equations algebraic system that describes the distribution of temperatures by the constituent elements of the EMM. Results. The thermal calculation results of the electromagnetic mill showed that the maximum heating temperature is much lower than the allowable one for the selected insulation class. According to the hydraulic scheme, the necessary oil consumption, its average speed and the corresponding pressure at the inlet of the intake pipe are determined, which are at an acceptable level. It is noted that the rather moderate temperature state of the inductor and the hydraulic parameters of the oil path are facilitated by such innovations in the design of the EMM as the loop double layer short chorded winding and axial ventilation channels in the stator core. Originality. Now EMM thermal equivalent circuits with air cooling only have been presented. Therefore, the developed thermal circuit of the oil-cooled inductor is new and makes it possible to evaluate the operating modes of the EMM. Practical value. The proposed technical solutions can be recommended for practical implementation in other EMMs. Taking into account the identified reserves of the EMM temperature state, a forecast was made regarding the transition from its oil cooling to air cooling. But the use of air cooling requires a change in the design of the EMM.
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