Stable Levitation of a Passive Magnetic Bearing

Bachovchin, Kevin; Hoburg, James F.; Post, R.F.

doi:10.1109/tmag.2012.2209123

Cited by 59 publications

(17 citation statements)

References 10 publications

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“…A state-of-the-art passive magnetic bearing that consists of PMs coupled with a Halbach array stabilizer can stably levitate the rotor/flywheel in all directions [54]. The levitation system makes use of two pairs of annular ring PMs which provide an upward magnetic levitation force to counteract the downward gravitational force of the rotor/flywheel.…”

Section: On-board Energy Storagementioning

confidence: 99%

State-of-the-Art Electromagnetics Research in Electric and Hybrid Vehicles (Invited Paper)

Chau¹,

Jiang²,

Han³

et al. 2017

PIER

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Abstract-There is no doubt that electrified vehicles are superseding internal combustion engine vehicles for road transportation. Among them, electric vehicles (EVs) have been identified as the greenest road transportation while hybrid EVs have been tagged as the super ultra-low emission vehicles. In this paper, the definition, classification, merits and demerits of electric and hybrid vehicles are first introduced. Then, after revealing their multidisciplinary technologies and development trends, the state-of-the-art electromagnetics research in electric and hybrid vehicles are discussed, with emphasis on electric motors for electric propulsion, electric machine systems for hybrid propulsion, wireless power transfer technologies for park-and-charge a well as move-and-charge, electromagnetic interference and compatibility issues in EVs, electromechanical flywheels for energy storage and magnetic sensors for EV operation. Meanwhile, the development trend of these research areas is revealed.

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Section: On-board Energy Storagementioning

confidence: 99%

State-of-the-Art Electromagnetics Research in Electric and Hybrid Vehicles (Invited Paper)

Chau¹,

Jiang²,

Han³

et al. 2017

PIER

View full text Add to dashboard Cite

show abstract

“…Although there have been many studies on the magnetic force model of PMB and HMB in the literature [21][22][23][24][25], only few are dealing with PMB and HMB with Halbach array configuration [23][24][25]. To the best knowledge of the authors, almost no analytic magnetic force model for such system was presented in the literature, especially for the ring-type structure.…”

Section: Introductionmentioning

confidence: 99%

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

Toh¹,

Chen²

2016

Energies

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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.

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“…The magnetic bearings used in wind turbines can be classified into three types as follows: active, passive and hybrid magnetic bearings [13][14][15][16]. The active magnetic bearings (AMBs) have suspension forces for the rotor that are generated by the coil currents.…”

Section: Introductionmentioning

confidence: 99%

Basic Characteristics and Design of a Novel Hybrid Magnetic Bearing for Wind Turbines

Zhang

Sun

et al. 2016

Energies

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This paper proposes a five-degree-of-freedom (5-DOF) hybrid magnetic bearing (HMB) for direct-drive wind turbines, which can realize suspension in the 4-DOF radial and 1-DOF axial directions. Only two sets of radial control windings are employed in the proposed HMB because only one set of radial control windings can achieve the 2-DOF suspension in the radial direction. Unlike the traditional active thrust magnetic bearings, this paper uses a cylindrical rotor core without a large thrust disc in the novel HMB. The numbers of the controller, power amplifier and system volume can be reduced in the magnetic suspension system. This paper also presents the structure and basic characteristics of the proposed magnetic bearing. A precision equivalent magnetic circuit analysis of the permanent magnet ring and control magnetic field is conducted in this study, in consideration of the non-uniform distribution of magnetic density. Accordingly, the mathematical models, including the suspension force expression, are derived based on the accurate equivalent magnetic circuit. The basic principle of the structure parameter design is presented, based on the given key parameters. The accuracy of the analytical method is further validated by 3D finite element analysis.

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Stable Levitation of a Passive Magnetic Bearing

Cited by 59 publications

References 10 publications

State-of-the-Art Electromagnetics Research in Electric and Hybrid Vehicles (Invited Paper)

State-of-the-Art Electromagnetics Research in Electric and Hybrid Vehicles (Invited Paper)

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

Basic Characteristics and Design of a Novel Hybrid Magnetic Bearing for Wind Turbines

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