External vibration testing was performed on a semihermetic, direct drive compressor on magnetic bearings intended for U.S. Navy Shipboard use. The compressor was placed on a U.S. Navy MIL-STD-167 shaker platform and driven at sinusoidal frequencies from 4 to 33 Hz at graduated displacements equal to a maximum of 1.5 Gs. During the machine design phase, a linear forced response analysis of the coupled rotordynamic system model of the rotor, housing, and magnetic bearings was performed to predict rotor/housing displacements and actuator loads. The results were used to guide bearing sizing and control algorithm design. The measured rotor motion and actuator currents correlated well with predictions at all tested frequencies, amplitudes, and orientations. Analysis methodology, test results, and comparisons are reported here.

References

References
1.
Filatov
,
A. V.
,
McMullen
,
P. T.
,
Hawkins
,
L. A.
, and
Blumber
,
E.
,
2004
, “
Magnetic Bearing Actuator Design for a Gas Expander Generator
,”
9th International Symposium on Magnetic Bearings
, Lexington, KY, Aug. 3–6.
2.
Schweitzer
,
G.
, and
Maslen
,
E. H.
,
2009
,
Magnetic Bearings: Theory, Design, and Application to Rotating Machinery
,
Springer Verlag
,
Berlin, Germany
, pp.
288
294
.
3.
Hawkins
,
L. A.
,
Murphy
,
B. T.
,
Zierer
,
J.
, and
Hayes
,
R.
,
2002
, “
Shock and Vibration Testing of an AMB Supported Energy Storage Flywheel
,”
8th International Symposium on Magnetic Bearings
, Mito, Japan, Aug. 26–28.
4.
ISO
,
2006
,
Mechanical Vibration–Vibration of Rotating Machinery Equipped With Active Magnetic Bearings–Part 3: Evaluation of Stability Margin
,
International Organization for Standardization
,
Geneva, Switzerland
, No. 14839-3:2006.
You do not currently have access to this content.