Study on cooling system for SR motors by pumpless forced convection boiling equipment with liquid dielectric coolant

2022 21st IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (iTherm) Pub Date : 2022-05-31 DOI:10.1109/iTherm54085.2022.9899642

Hirotsugu Aoyama, Shohei Ohashi, Qian Yu, K. Matsuda

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Abstract

A forced convection boiling system with liquid dielectric coolant is proposed as a new cooling system for SR motors (switched reluctance motors) for electric vehicles. In a previous study, the superiority of cooling by liquid dielectric coolant was confirmed compared to conventional cooling by epoxy resin. We have improved the cooling method using this liquid dielectric coolant and devised a method to cool the coils by forced convection boiling of the liquid dielectric coolant inside the motor. The liquid dielectric coolant is divided into a "heating room" that is directly heated by coils and a "cooling room" that is cooled by external cooling water, and the liquid dielectric coolant is circulated in the two rooms. This system is named the "Boiling Immersion Cooling System". However, if boiling cannot be controlled, the coils are exposed from the liquid surface and the cooling capacity is lost. In this experiment, this cooling system was verified by experiment. In addition, to reduce the cost of performance estimation and model improvement, a thermo-fluid analysis method was established to reproduce the boiling phenomenon of liquid dielectric coolant in the simulation. Thermo-fluid analysis and experiments confirmed that thermal runaway due to coil exposure does not occur even when the heat generated by the coil is assumed to be 19 kW at the motor's steady-state output.

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含液体介质冷却剂的无泵强制对流沸腾装置对SR电机冷却系统的研究

提出了一种基于液体介质冷却剂的强制对流沸腾系统，作为一种新型的电动汽车开关磁阻电机冷却系统。在先前的研究中，通过与传统的环氧树脂冷却相比，证实了液体介电冷却剂冷却的优越性。我们改进了使用这种介质液体冷却剂的冷却方法，设计了一种通过对电机内部介质液体强制对流沸腾来冷却线圈的方法。液体介电冷却剂分为由盘管直接加热的“加热室”和由外部冷却水冷却的“冷却室”，液体介电冷却剂在两个房间内循环。这个系统被命名为“沸腾浸没冷却系统”。但是，如果沸腾不能控制，盘管就会从液体表面暴露出来，冷却能力就会丧失。在本实验中，通过实验对该冷却系统进行了验证。此外，为了减少性能估算和模型改进的成本，建立了一种热流体分析方法，在模拟中再现了液体介质冷却剂的沸腾现象。热流体分析和实验证实，即使假设线圈在电机稳态输出时产生的热量为19 kW，线圈暴露引起的热失控也不会发生。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2022 21st IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (iTherm)

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