Analysis and design on stator heat dissipation of motor in flywheel energy storage system

doi:10.19799/j.cnki.2095-4239.2024.1172

Abstract

Abstract:

To address the stator cooling challenges in the 500 kW flywheel energy storage motor, a spiral water jacket was installed on the outside of the stator. By simplifying the heat source and heat transfer model, an equivalent composite heat exchange model was established to optimize the liquid cooling design of the motor stator. Numerical simulations were conducted to validate the design, and the internal temperature distribution of the stator and friction resistance of the water jacket were calculated. When either the channel height or the channel width is fixed, increasing the other dimension increases the channel width or height, resulting in a reduced pressure drop and increased stator temperature. The optimized water channel dimensions establish critical operational limits, requiring the coolant flow rate and temperature to remain below certain values to meet the stator temperature requirements. Increasing the design temperature rise of the cooling water slightly decreased the maximum allowable inlet temperature of the cooling water. This simple and efficient design method provides a reference for the development of stator cooling systems for flywheel energy storage applications.

Key words: flywheel energy storage, motor stator, design of heat dissipation, water jacket, temperature, pressure loss

CLC Number:

TK 02

Yifei WANG, Fan XU, Liang WANG, Xingjian DAI, Yujie XU, Haisheng CHEN. Analysis and design on stator heat dissipation of motor in flywheel energy storage system[J]. Energy Storage Science and Technology, 2025, 14(5): 1946-1953.

Figures/Tables 12

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参数	数值
电机额定功率	500 kW
电网电压	380 V
工作转速范围	2250~4500 r/min
效率	97%
极对数	6
满载定子铁耗(2250 r/min)	2.053 kW
满载铜耗(2250 r/min)	2.975 kW
满载定子铁耗(4500 r/min)	3.178 kW
满载铜耗(4500 r/min)	0.978 kW

部件名称	材料	导热系数W/(m·K)
槽楔	环氧树脂	1.3
垫条	复合材料	0.294
绕组绝缘层	F级绝缘物	0.35
绕组	铜	385
绕组绝缘漆	复合涂层	13.3
定子铁芯	硅钢片	40
螺旋水套	结构钢	60.5

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