Magnetic Suspension System with Large Distance of 82 mm Using Persistent Current in Superconducting Coil

Abstract

Superconducting techniques are applied to a superconducting magnetic suspension system. A superconducting coil, copper coils, a magnetically suspended object, a photo sensor, a PID controller, and power amplifiers are the main components of the suspension system. A persistent current in the superconducting coil and a control current in the copper coils are used for suspending the object and controlling the object, respectively. This paper discusses a large gap trial for the suspension system, and the static and dynamic characteristics of the suspension system are studied. As a result, it is found that the magnetically suspended object continues to be suspended at a distance of 82 mm for more than 60 s. Since a superconducting persistent current has a maximum limit for the suspension system, a persistent current of 50 A is adopted. The details of the superconducting persistent current are studied for the performance of the suspension system. There are few reports about such a suspension system with a large gap of more than 80 mm using a superconducting persistent current.

Optimal Control for a Superconducting Hybrid MagLev Transport System with Multirate Multisensors in a Smart Factory

“…The proposed H 2 compensator is designed for a lifted sensor networked system (9) with exogenous input, ∼ w d , and output, ∼ z, and is applied to a multirate system (2). The observer and state feedback gain matrices are obtained from the unique positive-definite solutions of the dual discrete algebraic Riccati equations (DARE) (10) and (11) [2,19,[29][30][31]…”

“…The stability of the proposed state feedback controller is guaranteed because Lyapunov's stable condition ( 16) is satisfied by a Riccati equation, (11), similar to the general LQR (Linear Quadratic Regulator) compensator.…”

“…Step 5. Determine the optimal state feedback gain, ∼ F, to minimize the H 2 performance indices for the single-rate sampled data system by solving the discrete algebraic Riccati Equation (11).…”

“…This type of MagLev logistics transport system is divided into an on-board type and an in-track type depending on the location of the power device for electromagnetic suspension (EMS) [ 2 , 3 , 4 ]. In this paper, we consider an attracted superconducting hybrid (SH) electromagnetic suspension (EMS) [ 10 , 11 ]. This type is suitable for the above manufacturing process because all electromagnetic devices are installed on the track, so the electromagnetic impact of the system on transport logistics such as wafers and display panels is relatively low [ 12 , 13 , 14 ].…”