Control of magnetically suspended rotor combined with motor drive system

Abstract

This paper presents the cooperative control between the active magnetic bearing system and the permanent magnet synchronous drive. More specifically, the coupling between the vibration control and sensorless drive control is considered since both systems have the ability to estimate the angular speed. The coupling of the estimated speed in each controller is considered. Also, a modified start-up procedure for the sensorless vector control had to be developed when the drive is combined with the AMB system to accommodate the low friction which does not yield damping of the speed perturbation at start-up. Simulation results are presented for the developed control using detailed models for both systems.

State-space flux-linkage control of bearingless synchronous reluctance motors

“…Fig. 9(b) shows the result, when the mutual coupling is modeled according to (6) both in the plant model (16) and in the flux-linkage controller, i.e., whenM ′ = M ′ . Fig.…”

“…As can be seen from (3) and is shown in [18], L q , L s , and M (6). The mutual coupling between the windings is neglected in the controller, i.e.,M ′ = 0.…”

“…Fig. 6 shows the stability regions, when the mutual coupling is modeled according to (6) in the plant model (16), but neglected in the flux-linkage controller (i.e.,M ′ = 0). The white region represents stable parameter combinations and the cyan-shaded region represents unstable parameter combinations.…”

“…The control loop has to have sufficient bandwidth in order to compensate for such unbalance in rigid rotors [6]. Also, the bending modes of the rotor have to be taken into account in high-speed applications.…”