Digital control method and apparatus for rotary member supported by magnetic bearing
US5754425A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 22, 1995 |
| Grant date | May 19, 1998 |
| Priority date | — |
| Expiry date | Aug 22, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2360/45
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method of controlling the axis S of a rotary member 1 is disclosed which comprises the steps of: (a) sampling an inclined angle .theta. and it's rate d.theta./dt of the rotary member; (b) in response to the angle .theta. and rate d.theta./dt, analytically determining an assumed inclined angle motion of the rotary member at the end of each sampling period T when no control torque is applied to the axis during the sampling period; (c) dividing the assumed inclined angle motion into low and high frequency mode components; (d) determining rotational vectors Sp and Sn of the mode components in a free-conical motion; (e) determining rotational vectors of the divided mode components in a forced conical motion at the end of the sampling period, provided that an unknown constant control torque u(k) is virtually applied to the axis during one sampling period, but no free conical motion exists; (f) adding the rotational vectors in the free and forced conical motions for each of mode components; (g) determining the direction and magnitude of the unknown control torque u(k) for each of mode components so as to reduce the rotational vectors of the free conical motion; and (h) applying each of …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.