| Title |
Zero Power Levitation Control of Controlled-PM Electromagnet Levitation System by Reduced Order Extended State Observer |
| Authors |
김윤현(Kim, Youn-Hyun) ; 김솔(Kim, Sol) ; 이주(Lee, Ju) |
| Keywords |
Zero Power Levitation Control ; Controlled-PM Electromagnetic Levitation System ; Reduced Order Extended Luenberger Observer |
| Abstract |
This paper presents the scheme that improves control responsibility and stability of the controlled-PM electromagnet levitation system with zero Power controller. A magnetically levitation system is used widely because friction can almost be disappeared. But it is difficult to control due to restraint of controllable area and nonlinear characteristics of electromagnetic force, which is proportioned to a square of the magnetic flux density and is in inverse proportion to a square of the air-gap. So, the application of observer theory in which the levitation system is considered to be a linear dynamic model has resulted in omitting the time dependence on mover's speed. Consequently, the performance of the observer is quite poor during transients. Therefore, this paper proposed the controlled-PM electro-magnetic levitation control method in which the variable load is estimated by using the reduced order extended luenverger observer and its system is controlled at a new zero power equilibrium air-gap position. It is also verified that the proposed control method improve the control performance through simulation and experiment. |