Decentralized PI/PD position control for active magnetic bearings

Electromagnetic Analysis of Fuzzy Controlled Active Magnetic Bearings

“…The linearization of the above system has been achieved by considering that: the rotor is rigid and symmetrical, the gyroscopic effects as well as the magnetic flux are also neglected, the magnetism of iron is below the saturation level, the movement of the rotating mechanism in the axial direction is neglected and the leakage fluxes in the airgap are also neglected [5], [12]. In the rotor's equilibrium point as showed in fig 1, the only forces which act on the rotor are its weight (W) and the force (F 1 ) which is generated from the vertical pair of the electromagnets.…”

“…To this direction, the most important obstacle was the necessity for an appropriate control system of this new electromagnetic component. Many studies have been conducted with the use of linear controllers in linearized active magnetic bearing systems [5]. The need for better results has led to a further study of the system.…”

Study on stability and rotating speed stable region of magnetically suspended rigid rotors using extended Nyquist criterion and gain-stable region theory

“…In recent decades, many control strategies have been applied to MSRs, such as decentralized PID [2][3][4], decentralized PID plus cross-feedback [5,6], centralized PID plus cross-feedback [1,[7][8][9][10], adaptive control [11], robust control [12,13], inverse control [14,15] and optimal control [16][17][18][19]. Among these control methods, centralized PID plus cross-feedback control is widely used in industrial applications because it is simple and convenient to implement.…”

“…The first the classical analysis methods in the frequency domain, including the characteristics root method [3,[20][21][22], Routh-Hurwitz criterion method [4] and root locus method [6]. The characteristics root method is relatively simple; however, it can only analyze the stability at a specified speed.…”

Comparison of PID and Fuzzy PID Controller for a Linearised Magnetic Bearing

“…These advantages have been the subject of research work in a wide range of studies of magnetic bearings [1][2][3][4]. The above studies have shown the need for the use of linear controllers, in order to control the behaviour of the magnetic bearings [5]. The need for better results in conjunction with the limited abilities of linear controllers, lead the studies to create more complex models.…”