永久磁石反発を用いた磁気浮上天秤の試作

The repulsive type magnetic bearing system, which has the passive control utilizing the repulsive forces and active control along axial direction, is superior compared to other magnetic bearings in respect to reduce the number of peripheral devices. The repulsive type magnetic bearing has special features such as the soft and constant stiffness for passive control axes. Hence this system can be applied for a special device without impulse disturbance and mechanical contact for the levitator shaft. In this paper we make a proposition to apply to a thermobalance using the repulsive type magnetic levitation system. If our system can be applied, the accuracy of measurement and sensitivity will be high owing to null mechanical contacts of the levitator. This paper reports the configuration and noncontact levitation characteristics of the trial manufacture and introduces the differential thermobalance configuration made as a next plan.