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M-SV-001-EN Rev.E
Compressor Components
3.17 Magnetic Bearings
3.17.1 Function
The compressor shaft and impellers levitate
during operation and float on a magnetic
cushion created by the magnetic bearings.
Permanent magnets do most of the work and
electromagnets are used for trimming the shaft
position within 0.0003” (7 microns). One axial
(Z axis) and two radial (X & Y axis) magnetic
bearings are used to maintain shaft position. See
Figure 80 (Radial Magnetic Bearings) and Figure
72 (Axial Magnetic Bearing). Centered rotation is
instantaneously self-corrected and maintained by
the bearing control loop. See Figure 65 (Bearing
Control Signal Flow).
When not powered, the shaft is supported by
carbon composite or roller touchdown bearings.
Figure 80 - Radial Magnetic
Bearings
Figure 81 - Axial Magnetic
Bearing
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