| 摘要 |
<p>A back-up bearing arrangement (25) for a magnetic bearing (12, 13) includes a stationary dry running bearing material (30) and a rotatable collar (26) which runs in abutment therewith upon failure of the magnetic bearing. To avoid adhesive wear due to localised welding or melting of bearing material at surface asperities because of the inability of collar material (chosen to withstand centrifugal stresses at high rotation rates) to remove it adequately, the contact-making face of the collar is plated with a layer of copper on which is deposited a thin layer of titanium nitride.</p> |
