储能密度是储能飞轮的重要指标之一,选用碳纤维、玻璃纤维复合材料的储能飞轮可以有效提高储能密度,同时,选用磁悬浮支承则可以适应真空环境及减少损耗。但是,由此也增加了结构的复杂性,例如,连结飞轮转子中金属部件与复合材料之间的挠性薄壳轮毂具有不同于常规刚体飞轮的动力学模型特性。针对薄壳结构的模态振动特征与陀螺效应控制之间的矛盾,描述一种具有挠性结构储能飞轮的磁轴承控制方法。在模态分析的基础上,利用多通道添加相位整形的控制方法有效抑制了系统中的挠性结构的模态振动。试验结果表明,使用所设计的控制器,转子可平稳通过中心频率为340 Hz的轮毂——心轴挠性模态振动区域,运行转速475 Hz(28 500 r/min),轮缘最大线速度达到450 m/s,并成功实现飞轮的充放电过程。
Density of energy storage is one of the most important parameters of a energy storage flywheel. By using composite material of fiberglass and carbon fiber can achieve more higher density of energy storage, and the selection of AMBs can made the loss as lower as possible and adapt to vacuum environment also. But due to these kinds of selection, the structure become more complex, for instant, the hub of flexible shell between the steel and composite material in the flywheel rotor has a different dynamics to conventional flywheel of rigid body. Therefore, for settlement the conflict between the controlling of gyroscopic effect and the vibration of flexible structure, a AMBs control method which is described to deal with the flywheel with flexible structure. Based on analyzing the flexible modal of the hub-axis structure carefully, multi-channel phase shaper within the controller to restrain the vibration of the wheel hub flexible mode. The experimental results show that the rotor can pass the vibration region of the flexible mode which center frequency is about 340 Hz smoothly. The flywheel rotor ran up to 475 Hz (28 500 r/min), and the maximum speed of the rotor edge reaches 450 m/s. After that, the flywheel is charged and discharged with electricity successfully.
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