| 摘要 |
PROBLEM TO BE SOLVED: To achieve durability that can withstand a number of touchdowns without corroding a bearing itself even in a corrosive circumstance, and to obtain a touchdown bearing capable of stabilizing the performance of a magnetic bearing device and improving its operational efficiency. SOLUTION: A holder 24 is made from a metal of a lead-containing copper family, and the whole or a part of the surface, other than the surface for rolls of an internal ring 21 and an external ring 22, is coated with a material represented by zinc and having high tendency for ionization. An important part can be well protected by utilizing the material having a high tendency to be ionized as a sacrificial positive-pole member 17. |
