Abstract
For the development of high speed flywheel rotation in a vacuum chamber, technology for establishing magnetic bearing in ultra low loss and measures for preventing spillover vibration are necessary. For these purpose, two test rigs, one involving magnetic bearing and the other, a medium-size flywheel were conducted in the present study. With the former, a technique for reducing magnetic bearing loss was investigated. In the latter, many trials were carried out in attempt to find means for preventing spillover vibration. Based on the results, two important finds became evident. First, bearing loss could be reduced to 1/6 that in conventional control, through use of zero power control and homo-polar magnetic poles. Secondly, flywheel rotation as much as 12000rpm was possible with no significant vibration through phase lead adjustment and the use of a stabilizing filter. Both these possibilities may be attributed to the very precise measurement of eigen frequency and the damping ratio.
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