MW级飞轮电机转子中空轴内通流散热实验研究

doi:10.19799/j.cnki.2095-4239.2025.0518

储能科学与技术 ›› 2025, Vol. 14 ›› Issue (8): 2925-2931.doi: 10.19799/j.cnki.2095-4239.2025.0518

• 短时高频高功率储能专辑 • 上一篇

MW级飞轮电机转子中空轴内通流散热实验研究

李博文¹(), 文贤馗¹, 范强¹, 古庭赟¹, 史正军²^,³(), 张晓寅²

^1.贵州电网有限责任公司电力科学研究院，贵州贵阳 550002
^2.广东新型储能国家研究院有限公司，广东广州 510420
^3.南方电网电力科技股份有限公司，广东广州 510623

收稿日期:2025-05-30 修回日期:2025-06-24 出版日期:2025-08-28 发布日期:2025-08-18
通讯作者: 史正军 E-mail:libowen_gz@163.com;shizj02@139.com
作者简介:李博文（1993—），男，硕士，工程师，研究方向为电力系统运行与控制，E-mail：libowen_gz@163.com；
基金资助:
中国南方电网有限责任公司科技项目(GZKJXM20232282);国家重点研发计划项目(2024YFE0208100);贵州省科技创新人才团队（黔科合平台人才-CXTD［2022］008）

Experimental study on heat dissipation through circulation in the hollow shaft of MW-class flywheel motor rotor

Bowen LI¹(), Xiankui WEN¹, Qiang FAN¹, Tingyun GU¹, Zhengjun SHI²^,³(), Xiaoyin ZHANG²

^1.Electric Power Research Institute of Guizhou Power Grid Co. , Guiyang 550002, Guizhou, China
^2.National Institute of Guangdong Advanced Energy Storage, Guangzhou 510420, Guangdong, China
^3.China Southern Power Grid Technology Co. , Ltd. , Guangzhou 510623, Guangdong, China

Received:2025-05-30 Revised:2025-06-24 Online:2025-08-28 Published:2025-08-18
Contact: Zhengjun SHI E-mail:libowen_gz@163.com;shizj02@139.com

摘要/Abstract

摘要：

针对真空环境下大容量飞轮储能系统电机转子的散热难题，本工作基于1.25 MW飞轮储能机组，提出了飞轮电机转子中空轴内通流散热方案，以降低转子温升。首先，基于热传导方程和对流传热方程建立了转子轴系温度场数学模型。理论计算表明，在无冷却工况下，转子表面温度随运行时间呈线性增长；而采用轴内通流散热方案后，转子温度最终可稳定在一定值。为验证所提方案的可行性和有效性，建立了真空飞轮电机转子轴内通流散热实验台。实验结果表明，轴内通流散热方案能够有效抑制转子温升。进一步研究表明，增加导热油流量可增强散热效果，提升转速能有效控制转子温升，且加热功率与温升速率呈线性正相关。本工作可为高功率密度转子热管理设计提供理论依据与工程实践参考。

关键词: 飞轮储能, 电机转子, 中空轴冷却, 对流传热

Abstract:

Cooling the motor rotors in large-capacity flywheel energy storage systems operating in vacuum environments is a significant challenge. Aiming to reduce the temperature rise of the rotor, a 1.25 MW flywheel energy storage unit is proposed herein to provide an axial internal flow cooling scheme for the hollow shaft of the flywheel motor rotor. A mathematical model of the temperature field in the rotor shaft was developed by integrating heat conduction and convection equations. The predictions of the model reveal that in the absence of any cooling measures, the surface temperature of the rotor rises linearly with the operating time. However, with the proposed hollow shaft internal flow cooling scheme, the rotor temperature can be effectively stabilized, demonstrating the potential for controlling the temperature rise. To validate the feasibility and effectiveness of the proposed cooling scheme, an experimental platform was carefully designed and constructed. The hollow shaft internal flow cooling scheme is highly effective in curbing the temperature rise of the rotor. Detailed analysis shows that increasing the flow rate of the cooling medium (heat-transfer oil) leads to a significant enhancement in the cooling effectiveness. Further research shows that increasing the flow rate of the heat-transfer oil can enhance the heat dissipation effect, raising the rotational speed can effectively control the temperature rise of the rotor, and by increasing the heating power, the rate of the temperature rise can be controlled in a linear manner. This study provides a practical and effective solution to the pressing issue of rotor cooling in such systems.

Key words: flywheel energy storage system, motor rotor, hollow shaft cooling, convection heat transfer

中图分类号:

TK 02

李博文, 文贤馗, 范强, 古庭赟, 史正军, 张晓寅. MW级飞轮电机转子中空轴内通流散热实验研究[J]. 储能科学与技术, 2025, 14(8): 2925-2931.

Bowen LI, Xiankui WEN, Qiang FAN, Tingyun GU, Zhengjun SHI, Xiaoyin ZHANG. Experimental study on heat dissipation through circulation in the hollow shaft of MW-class flywheel motor rotor[J]. Energy Storage Science and Technology, 2025, 14(8): 2925-2931.

图/表 12

图 1

图 2

图 3

表 1

轴内流动传热参数变量"

尺寸参数	变量名	值/ $m m$	工况参数	变量名
导管内径、外径	$2 r i, 2 r o$	44.845, 47.803	入口流速	$u i n$
导管与中空轴顶距	$S$	63	入口温度	$T i n$
中空轴内径	$2 r f i$	100	转子轴转速	$n$
流道出口内径	$2 r f o$	59	转子发热量	$Φ$
转子直径	$2 R$	472	环境压力	$p 0$
转子高度	$H$	575

表 1

表 2

材料物性参数(25 ℃)"

物性参数	钢	硅钢片	导热油
密度/(kg/m³)	7850	7650	823.8
导热系数/[W/(m·K)]	44	35	0.1284
比热容/[J/(kg·K)]	460	500	1906.8
动力黏度/[ $k g / m · s$ ]	—	—	0.02812

表 2

图 4

表 3

表 4

图 5

图 6

图 7

图 8

参考文献 21

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序号	类型	型号	量程	精度	位置
1	温度	红外温度传感器	0~200 ℃	±1 ℃	转子轴顶端、底端
2	温度	PT100热电阻	0~300 ℃	±0.1 ℃	油箱出口、导管入口
3	流量	涡街流量计	0~50 L/min	1.5%	导管入口
4	压力	ZJ-52T真空规管	0.1~10⁵Pa	25%	真空泵
5	转速	霍尔传感器	0~20 kHz	5%	转子轴顶测速齿盘

序号	腔内压力/Pa	转子轴转速/(r/min)	磁加热功率/W	导热油流量/(L/min)
1	7000	0	500	21
2	7000	300	500	21
3	7000	600	500	21
4	7000	900	500	21
5	7000	300	1000	21
6	7000	300	1500	21
7	7000	300	500	13
8	7000	300	500	17

MW级飞轮电机转子中空轴内通流散热实验研究

Experimental study on heat dissipation through circulation in the hollow shaft of MW-class flywheel motor rotor

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