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

Chow-Shing Toh and Shyh-Leh Chen
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Chow-Shing Toh: Department of Mechanical Engineering and Advanced Institute of Manufacturing with High-Tech Innovations, Chiayi 62102, Taiwan
Shyh-Leh Chen: Department of Mechanical Engineering and Advanced Institute of Manufacturing with High-Tech Innovations, Chiayi 62102, Taiwan

Energies, 2016, vol. 9, issue 12, 1-19

Abstract: 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.

Keywords: Halbach array; magnetic bearing; flywheel battery; nonlinear control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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