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Open AccessArticle

Design, Modeling and Control of Magnetic Bearings for a Ring-Type Flywheel Energy Storage System

Department of Mechanical Engineering and Advanced Institute of Manufacturing with High-Tech Innovations, Chiayi 62102, Taiwan
Author to whom correspondence should be addressed.
Academic Editor: Paul Stewart
Energies 2016, 9(12), 1051;
Received: 19 August 2016 / Revised: 22 November 2016 / Accepted: 2 December 2016 / Published: 14 December 2016
(This article belongs to the Special Issue Next-Generation Low-Carbon Power and Energy Systems)
This study is concerned with the magnetic force models of magnetic bearing in a flywheel energy storage system (FESS). The magnetic bearing is of hybrid type, with axial passive magnetic bearing (PMB) and radial hybrid magnetic bearing (HMB). For the PMB, a pair of ring-type Halbach arrays of permanent magnets are arranged vertically to support the rotor weight. For the HMB, a set of ring-type Halbach array is placed on the rotor side, which corresponds to coil sets on the stator side. The HMB can produce both attraction and repulsion forces on the radial direction, depending on the direction of the coil currents. It is found that the ring-type configuration and the differential winding scheme for coil sets can yield linear magnetic force models for both PMB and HMB. Based on the obtained magnetic force model, an integral sliding mode controller is designed for the stable rotor levitation in the radial direction. The experimental results show that the rotor can be stabilized to the bearing center, verifying the accuracy of the magnetic force models and effectiveness of the levitation controller. View Full-Text
Keywords: Halbach array; magnetic bearing; flywheel battery; nonlinear control Halbach array; magnetic bearing; flywheel battery; nonlinear control
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Toh, C.-S.; Chen, S.-L. Design, Modeling and Control of Magnetic Bearings for a Ring-Type Flywheel Energy Storage System. Energies 2016, 9, 1051.

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