| 摘要 |
<p>In an magnetic bearing arrangement for a rotatable shaft 11 (Figure 1) including electromagnetic journal bearings 20, 21 and electromagnetic thrust bearings 22, 23, back-up bearing means is provided as hydrostatic journal bearings 50, 51 and thrust bearings 52, 53. The hydrostatic bearings are energised by control means 63 in response to detected failure of the magnetic bearing to support the shaft in any particular direction within a permitted range of displacements and supplied with fluid at such pressure to support the shaft on a fluid film at all speeds down to rest. Preferably the fluid is a gas. <IMAGE></p> |
