A hybrid (permanent magnet and foil) bearing set for complete passive levitation of high-speed rotors

Bekinal, Siddappa Iranna; Kulkarni, Sadanand; Jana, Soumendu

doi:10.1177/0954406216652647

Cited by 18 publications

(15 citation statements)

References 26 publications

(34 reference statements)

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“…The interaction between only axial–radial polarized rings is shown in Figure 2, whereas interaction between axial–axial and radial–radial polarized rings are presented in Bekinal et al. 5 Figure 2 shows the PM bearing with u th rotor and v th stator ring. The rotor on which u th ring is mounted is free to move in Cartesian coordinate system with respect to v th stator ring.…”

Section: Mathematical Modelmentioning

confidence: 99%

Generalized optimization procedure for rotational magnetized direction permanent magnet thrust bearing configuration

Bekinal¹,

Doddamani

Vanarotti³

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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Optimization of rotational magnetized direction permanent magnet thrust bearing configuration is carried out using generalized three-dimensional mathematical model. The bearing features namely axial force and stiffness are maximized using in-house developed mathematical expressions solved using MATLAB. The design variables selected for the optimization are axial offset, number of ring pairs, air gap and inner radius of inner and outer rings. The maximized axial force values of the optimized configuration are validated with the finite element analysis results. To overcome the high computational cost associated with three-dimensional equations, generalized method of optimization is sucessfully demonstrated using plots representing variation of optimal design variables as a function of air gap with respect to bearing’s outer diameter. Simple and useful method of using the generalized plots for the process of optimization is presented by dimension optimization of representative bearing configuration with a particular aspect ratio. The proposed optimization using mathematical model and generalized approach assists designer in selecting optimized geometrical parameters of rotational magnetized direction thrust bearing configurations easily for variety of high-speed applications.

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Section: Mathematical Modelmentioning

confidence: 99%

Generalized optimization procedure for rotational magnetized direction permanent magnet thrust bearing configuration

Bekinal¹,

Doddamani

Vanarotti³

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

Self Cite

View full text Add to dashboard Cite

show abstract

“…PMBs do not require any input energy, sensors, electrical and electronics components to perform their function as compared to active magnetic bearings. Due to these attractive features, PMBs have been utilized to support both low [5,6] and high-speed [7][8][9][10][11] rotors in different applications. The mathematical equations addressing force and stiffness characteristics in single as well as multi-ring radial [12][13][14][15] and thrust [16][17][18][19] PMBs have been presented in the literature.…”

Section: Introductionmentioning

confidence: 99%

Optimum Design Methodology for Axially Polarized Multi-Ring Radial and Thrust Permanent Magnet Bearings

Bekinal¹,

Doddamani²

2020

PIER B

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This article deals with the generalized procedure of designing and optimizing multi-ring radial and thrust permanent magnet bearings (PMBs) with an axial air gap for maximum force and stiffness per volume of the magnet. Initially, the procedure of determining optimized design variables in both the configurations is presented using the MATLAB codes written for solving the three dimensional (3D) equations of force and stiffness in PMB having 'n' number of rings on the stator and rotor. The maximized results of the forces in both radial and thrust multi-ring PMBs are validated with the values obtained using finite element analysis (FEA). Then, the correlation between the optimized parameters and the air gap is obtained, and curve fit equations for the same are proposed in terms of stator outer diameter. Further, curve fit equations establishing the relationship between the maximized bearing features, and the aspect ratio (L/D4) of the bearing are expressed for different values of air gap in both the radial and thrust bearings. Finally, the generalized method of designing and optimizing the multi-ring PMB is demonstrated with a specific application. A designer can use the presented curve fit equations for optimizing design variables and calculating maximized bearing features in multi-ring radial and thrust PMBs easily just by knowing the bearing features for a single ring pair.

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“…These are simpler due to the absence of sensors, actuators, and electronic equipment required in the effective functioning of active magnetic bearings [4]. In high-speed applications [5][6][7][8] where the aforementioned features are highly desirable, PMB is the most suitable candidate to enhance the system efficiency. The load-carrying capacity and stiffness of PMB consisting of only one ring pair can be determined using two-dimensional (2D) [9][10][11][12] or 3D [13][14][15][16][17][18] equations and these features are too low as compared to the conventional bearings.…”

Section: Introductionmentioning

confidence: 99%

Improvement in the Design Calculations of Multi Ring Permanent Magnet Thrust Bearing

Bekinal¹,

Doddamani²

2020

PIER M

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This article presents the design and optimization of multi-ring permanent magnet thrust bearing (PMTB) with an axial air gap between successive axial stacks. Larger air gap due to the inclusion of conductive materials needs to be critically analysed in permanent magnet bearings with eddy current damper. High conductivity materials can be filled in an axial air gap instead of a radial air gap to increase the required amount of damping. Three-dimensional (3D) mathematical model for loadcarrying capacity for the said configuration is presented using the Coulombain model. The significance of an axial air gap between successive ring pairs in the configuration concerning maximization in the bearing characteristics is presented. Variables such as the number of axial stacks, an axial air gap between the successive rings, an inside radius of rotor ring magnets, and an inside radius of stator ring magnets are optimized at different air gap values for maximizing the load-carrying capacity and stiffness. A significant increase in the values of bearing characteristics is observed in the optimized configuration as compared to bearing with a single permanent magnet ring pair. Optimized PMTB with comparable load carrying capacity and stiffness values can be used to replace conventional bearings used in highspeed applications to improve system efficiency.

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A hybrid (permanent magnet and foil) bearing set for complete passive levitation of high-speed rotors

Cited by 18 publications

References 26 publications

Generalized optimization procedure for rotational magnetized direction permanent magnet thrust bearing configuration

Generalized optimization procedure for rotational magnetized direction permanent magnet thrust bearing configuration

Optimum Design Methodology for Axially Polarized Multi-Ring Radial and Thrust Permanent Magnet Bearings

Improvement in the Design Calculations of Multi Ring Permanent Magnet Thrust Bearing

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