The SB-7700 balancing monitor was used to carry out the online balancing experiment on the rotor-bearing unit of the flywheel energy storage system. The additional balance process flywheel was designed according to the balancing test results. The flywheel rotor-bearing system arrived at the rated speed of 3600 r/min after the rotor-bearing unit was balanced by the two-plane balancing method. The vibration monitor measurement showed that the vibration expressed some difference between the charging and discharging state. The discharging power rate had great impact on the amplitude-frequency performance at the resonance of the rotor-bearing unit. This was caused by the bias electrical-magnetic force of the permanent motor.% 采用SB-7700型动平衡仪对400 kW/10 MJ飞轮储能系统轴系进行了本机动平衡，依据动平衡结果，提出了增加平衡工艺飞轮的修改设计。采用两平面方法进行本机动平衡后，飞轮储能机组达到额定3600 r/min的高速稳定运行。振动测试表明，充电、放电状态振动特性有所差别，放电功率对共振区振动幅频特性有显著影响，这反映了永磁电机电磁力对同步振动的作用。
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