Modelling, Analysis, and Control of Power-Converter-Fed Electromagnetic Bearing

Prasad, KNV and Jayanth, GR and Narayanan, G (2022) Modelling, Analysis, and Control of Power-Converter-Fed Electromagnetic Bearing. In: 3rd IEEE International Power and Renewable Energy Conference, IPRECON 2022, 16-18 December 2022, Kollam.

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Abstract

Bearings are the critical components in rotating machines to support the rotating parts. An electromagnetic bearing (EMB) supports the rotors of machines through controlled magnetic forces. Due to their non-contact and lubrication-free operation, EMBs are becoming an attractive solution for high-speed and clean applications. These EMBs are inherently unstable systems and require closed-loop control for stabilization. The unstable pole constrains the achievable control specifications such as gain margin, phase margin and bandwidth. The controller design that ensures stability margins as required is critical. This paper reviews the simplified modelling of the EMB system, P and PD controllers design and their drawbacks in stabilizing the EMB. The relation between the stability margins and the unstable pole is analyzed using Bode's gain-phase relation. A systematic PID controller design procedure that ensures the required stability margins is presented. The simulation results comparing P, PD, and PID controllers are presented. Further, the performance of the PID controller is validated on a nonlinear model. Although the controller is designed for the linear model, the simulation results agree with the requirements. © 2022 IEEE.

Item Type:	Conference Paper
Publication:	2022 IEEE International Power and Renewable Energy Conference, IPRECON 2022
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Closed loop control systems; Controllers; Electric control equipment; Magnetic bearings; Power converters; Proportional control systems; Three term control systems, Active Magnetic Bearing; Bearing; Bode gain-phase relation; Electromagnetic bearings; Phase relation; PID controllers; Plant control; Stability margins; Unstable plant control; Unstable plants, Position control
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	20 Apr 2023 06:38
Last Modified:	20 Apr 2023 06:38
URI:	https://eprints.iisc.ac.in/id/eprint/81347

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