Squeeze Film Forces in a Magnetic Shaft Suspension System

[+] Author and Article Information
L. D. Knox

Philips Laboratories, North American Philips Corp., Briarcliff Manor, N.Y. 10510

J. Tribol 106(4), 473-476 (Oct 01, 1984) (4 pages) doi:10.1115/1.3260967 History: Received December 22, 1983; Online October 29, 2009


Viscous squeeze film forces were studied as they pertain to a magnetic shaft suspension system (magnetic bearing). A nonrotating magnetically suspended shaft generates hydrodynamic fluid forces as it oscillates radially within a close fitting concentric cylinder. Experimental results from a scaled model verify the theoretical analysis. The study includes the finite and infinite length cases (1/4<L/D<8) for large diameter to clearance ratios (D/c>50). The viscous squeeze film forces increase the phase margin in the magnetic bearing closed-loop control systems used in state-of-the-art cryogenic refrigerators.

Copyright Ā© 1984 by ASME
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