20kW/2kWh复合材料飞轮轴系动平衡试验

Dynamic Balance Experiment of the 20kW/2kWh Composite Flywheel Shafting

为开展飞轮储能技术应用于智能电网的实用型研究,研制了20kW/2kWh的复合材料飞轮储能系统。复合材料飞轮原始不平衡量大,主要集中在碳纤维轮缘上。依托"SB-7700"动平衡仪,分别在飞轮平动模态区和摆动模态区,应用两平面影响系数法,在动平衡机上和现场进行动平衡,将上下轴承处的振幅抑制在10μm以内,减振效果良好。空气阻力、散热问题和稀薄气体电极放电等限制飞轮高速运行,采用导热性好、质量轻的氦气替换空气以减小阻力。飞轮平稳通过前二阶临界转速,转速达到7500r/min,为后续高速运行试验打下基础。

In order to carry out the practical research of flywheel energy storage in smart grid, a 20kW/2kWh composite flywheel energy storage system was developed Composite flywheel original eccentric mass was remarkable and mainly concentrated on the carbon fiber wheel rim. Using influence coefficient method of the two planes both in translational mode area and oscillation mode area, dynamic balance was realized through dynamic balancer and on-site with the help of ＂SB- 700＂ balance monitor. The vibration amplitude was suppressed in less than 10μm. Problems of air resistance, heat dissipation and rarefied gas electrode discharge limited the flywheel speed, so that helium with better thermal conductivity and light quality was applied as replacement to reduce the air resistance. The flywheel passed through the first two critical speeds, and it reached at, 7500r/min. which was helpful for rotation test later.