Research on mechanics and dynamics of MW-level large energy storage flywheel shafting

doi:10.19799/j.cnki.2095-4239.2023.0925

Abstract

Abstract:

Current research on high-power, large-capacity flywheel energy storage systems remains insufficient. This study focuses on a newly developed prototype of a MW/100 MJ flywheel. We analyzed the structural mechanics of both built-in and surface-mounted flywheel motor rotors, assessed the impact of different dynamic balance block materials on stress and deformation, and performed a dynamic characteristics analysis of the shaft system. Experimental validation of the flywheel prototype was conducted to ascertain system stability. Findings from numerical calculations suggest that the surface-mounted design substantially reduces stress on the silicon steel sheet, although this configuration typically necessitates a carbon fiber reinforced layer to prevent the magnetic steel from detaching from the silicon steel sheet under centrifugal forces during operation. Stress values increased by over 45% when using stainless steel for the dynamic balance block compared to aluminum alloy. The shaft system's dynamic analysis revealed two rigid vibration modes at operational speeds of 1300 r/min and 4200 r/min, corresponding to translational and conical movements, respectively. Experimental observations confirmed a peak vibration at 1300 r/min, corroborating the numerical simulations. However, the anticipated critical speed (conical motion) at 4200 r/min did not manifest as a significant peak in actual tests, indicating that translational vibration modes are more prone to excitation in this shaft configuration.

Key words: flywheel, motor, numerical simulation

CLC Number:

TM 743

Dongxu HU, Shaofei ZHU, Xiaogang WEI, Yadong CUI, Baohong ZHU, Xingjian DAI, Wen LI, Haisheng CHEN. Research on mechanics and dynamics of MW-level large energy storage flywheel shafting[J]. Energy Storage Science and Technology, 2024, 13(5): 1542-1550.

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References 19

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性能指标	日本	美国	加拿大	西班牙	“十三五”国家重点项目	华驰动能	深圳坎德拉
储能/kWh	100	25	50	50	10	125	35
转速/(r/min)	6000	16000	10500	6600	18000	5200	8800
材料	复合材料	复合材料	高强钢	高强钢	复合材料	高强钢	高强钢
功率/kW	300	100	500	500	400	500	1000

材质	硅钢	永磁体	碳纤维复合材料
抗拉强度/MPa	≥450	≥80(抗拉)，≥1050(抗压)	≥2881
模量/GPa	200	160	8(径向)，234(环向)
密度/(kg/m³)	7810	8000	1557
泊松比	0.26	0.28	0.30

支撑刚度/(N/m)	无阻尼临界转速/(r/min)	振动峰值对应转速/(r/min)	振型
5×10⁷	1315	1300	平动
	4196	4200	锥动
	15958	15900~16000	一弯

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