Research and test verification on simulation technology of motor temperature field of flywheel energy storage device

doi:10.19799/j.cnki.2095-4239.2024.0231

Abstract

Abstract:

The motor is the fundamental component of the flywheel energy storage system that realizes electric-kinetic energy conversion. Its design characteristics of small size, large power, and medium vacuum operation environment lead to prominent temperature increases. The structural design of the water channel is crucial for enhancing heat dissipation. Starting from two aspects of flow characteristics and cooling efficiency, this paper compares the influence of the spiral channel, circumferential channel, and axial channel inlet and outlet pressure differences, heat transfer area, heat transfer coefficient, and other factors on heat dissipation. It considers all factors to determine the channel form of the motor as a circumferential channel. The heat dissipation of the motor and its components is crucial for the safe operation of the flywheel energy storage system. This is a critical scientific and technical problem that needs to be addressed in the development of the flywheel energy storage technology. Accurately calculating the rise in temperature is crucial to solving this problem, which is of great significance to the research on the thermal management of flywheel energy storage systems. In this paper, the finite element thermal simulation of a 40 kW flywheel energy storage system is performed, focusing on model simplification, key component equivalence, loss distribution, and other aspects. The temperature field simulation calculation of the motor is performed considering the heat conduction, convection, and radiation in the heat transfer process, the multi-physical coupling of the fluid and temperature fields, the initial water flow rate of 25 L/min, and the temperature of 18 ℃. Finally, the calculation results are compared with the test results, and the error is within 3%, verifying the accuracy and reliability of the simulation calculation. The calculation method is a reliable reference for designing flywheel energy storage motors in the future.

Key words: flywheel energy storage, temperature field, electric machine, thermal radiation

CLC Number:

TK 02

Qianqian ZHOU, Yong HUANG, Ke CUI, Danan SUN. Research and test verification on simulation technology of motor temperature field of flywheel energy storage device[J]. Energy Storage Science and Technology, 2024, 13(8): 2589-2596.

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项目	面积/m²	平均换热系数/[W/(m²·K)]	温差K(损耗为2 kW)
螺旋水道	0.365302	2.9105	1.1708
周向水道	0.373318	2.945	1.0995
轴向水道	0.366736	3.205	1.0674

参数	数值/W
定子铁耗	860
绕组铜耗	630
磁钢涡流损耗	2
杂散损耗	700
磁轴承损耗	380

电机	材料	热导率λ/(W/K)	比热容C /(J/kg·K)	密度ρ /(kg/m³)
绕组	铜	387.6	381	8978
定子铁芯	35W300	44.2，44.2，1.192	502	7650
磁钢	SmC030H	10	370	8400
压圈	Q355NB	44.8	465	7850
底座	Q235A	44.8	465	7850
绝缘物	等效绝缘体	0.1	1450	1500
冷却介质	水	0.6	4200	1000

参数	仿真结果	试验结果	误差
绕组热点温度/℃	77.41	78	-0.7%
绕组平均温度/℃	76.9	76	1.2%
护套热点温度/℃	207	202	2.5%
飞轮热点温度/℃	175	177	-1.1%

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