轴系超声波悬浮支撑技术研究

飞轮转速直接影响到飞轮储能系统的储能效率及工作性能，传统轴承摩擦系数大且极限转速较低，制约了飞轮储能系统的发展及应用，悬浮支撑技术为其理想解决方法。超声波悬浮支撑技术利用超声换能器高频振动能在振动表面与轴之间形成一定的悬浮间隙，有效降低摩擦系数，减小摩擦阻力矩，提高轴的转速。通过设计的实验装置，对轴系超声波悬浮支撑间隙进行测试，当悬浮间隙大于两接触表面粗糙度总和时，轴被悬浮起来，压电换能器驱动信号频率为21.34KHz，驱动电压由100V增加到220V，平均悬浮间隙从12.49μm增加到52.97μm。

Investigation on ultrasonic levitative support to high speed axis in fly wheel

The rotate speed has an effect on the storage rate and working performance of the fly wheel storage system, traditional bear has great friction coefficient and low limit speed, all of these restrict the development and application of fly wheel storage system, the ideal resolution is levitation support technology. Ultrasonic levitative support technology is using the high frequency vibration of ultrasonic transducer to form the interstice between the axis and vibrating surface, reduce fraction coefficient, decrease friction resistance moment, and increase the rotate speed. According to the testing equipment, the interstice of ultrasonic levitative support has been measured; the axis should be levitative supported when interstice lager than the summation roughness of scratch surfaces, the average interstice is up to from 12.49 to 52.97 micrometer under the condition of voltage is of 100 to 220 volt and frequency is of 21.34 kilo hertz.