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.