Method of controlling position of rotary shaft in magnetic bearing
US5376871A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 2, 1992 |
| Grant date | Dec 27, 1994 |
| Priority date | — |
| Expiry date | Oct 2, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B11/42
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In a magnetic bearing carrying a rotary shaft in the air, the rotary shaft is required to rotate substantially at the same position. In controlling the position of the rotary shaft, a first exciting current I.sub.f is supplied to a plurality of first electric magnets formed in the proximity of one end of the rotary shaft, whereas a second exciting current I.sub.r is supplied to a plurality of second electric magnets formed in the proximity of the other end of the rotary shaft. The first exciting current I.sub.f is represented by the sum of a first biasing current I.sub.f, a first control current i.sub.Hf for translation, and a first control current i.sub.Kf for rotary motion. The second exciting current I.sub.r is represented by the sum of a second biasing current I.sub.r, a second control current i.sub.Hr for translation, and a second control current i.sub.Kr for rotary motion. Under such conditions, a ratio I.sub.f /I.sub.r between the first and second biasing currents, a ratio i.sub.Hf /i.sub.Hr between the first and second control currents for the translation, and a ratio i.sub.Kf /i.sub.Kr between the first and second control currents for the rotary motion are appropriately de…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.