Technical Brief

Optimization of Eight Pole Radial Active Magnetic Bearing

[+] Author and Article Information
K. P. Lijesh

Mechanical Department,
Indian Institute Technology Delhi,
New Delhi 110016, India
e-mail: lijesh_mech@yahoo.co.in

Harish Hirani

Associate Professor
Mechanical Department,
Indian Institute Technology Delhi,
New Delhi 110016, India
e-mail: hirani@mech.iitd.ac.in

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received August 24, 2014; final manuscript received November 9, 2014; published online December 18, 2014. Assoc. Editor: Bugra Ertas.

J. Tribol 137(2), 024502 (Apr 01, 2015) (7 pages) Paper No: TRIB-14-1211; doi: 10.1115/1.4029073 History: Received August 24, 2014; Revised November 09, 2014; Online December 18, 2014

In the current paper, studies carried out to design an eight pole electromagnetic bearing have been presented. The magnetic levitation force, accounting the copper and iron losses, was maximized for the given geometric constraints. Derivation of winding constraint equation in terms of wire diameter, number of turns, and dimensions of pole has been presented. Experiments were conducted to establish the constraints related to temperature rise. Finally, the dimensions of the electromagnet for maximizing the force obtained using numerical optimization have presented.

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Fig. 1

(a) Active magnetic bearing and (b) two orthographic views of the top electromagnet

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Fig. 2

Winding constraint

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Fig. 3

Winding space and air gap

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Fig. 4

Experimental setup with electromagnet core

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Fig. 5

Location of thermocouple: (a) experimental measurement and (b) schematic figure

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Fig. 6

Change in temperature of winding with respect to time

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Fig. 7

Measurement of magnetic flux density using Gauss meter

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Fig. 8

Reduction in magnetic flux density with rise in temperature

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Fig. 9

Dimensions of electromagnet

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Fig. 10

Objective function with respect to the number of iteration



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