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Yoshimitsu Kobayashi,Yoko Terai,Minoru Sasaki 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
This paper describes the three-dimensional motion control of a magnetic levitated object in an active electromagnetic levitation conveyance system. Generally, the magnetic levitation conveyance system is useful when we convey products without qualitative degradation due to contact. However it is necessary to control the three-dimensional motion of the levitated object and it is difficult to measure the position. Therefore we propose how to estimate three-dimensional position without a position sensor. Four Hall elements are installed on the bottom of the electromagnet instead of the position sensor. A state observer estimates the three-dimensional position of the levitated object from the four Hall voltages and the current and the input voltage to the electromagnet. The three-dimensional motion controller uses a state-feedback control based on the estimated position. This controller has a large stability margin in order to compensate the modelization error. The validity of the proposed method is confirmed by experiment results.
Inorganic Microballon Production from Shinju - Gan Using an Entrained Bed Reactor
Yoshimitsu Uemura,Sumio Nezu,Hidetaka Honda,Yoshihiro Ohzuno,Ijichi , Kazuya,Hatate, Yasuo 한국화학공학회 1999 Korean Journal of Chemical Engineering Vol.16 No.6
Hollow inorganic microparticles were produced continuously from a volcanic glass (shinju-gan or perlite) using an entrained bed reactor. The microparticles are called expanded perlite. The raw material was a sieved fraction (104㎛ in volume average diameter) of crushed perlite, which is from China. The effects of temperature and residence time on expanded perlite yield were investigated.