Magnetic bearing devices
US5973468A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 18, 1997 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | Jul 18, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2360/45
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
To provide magnetic bearing devices capable of preventing undesirable consequences caused by conical mode or parallel mode resonance which is liable to occur during acceleration of a rotor. A band-pass filter 24 is connected in series with a PID control circuit 12 is for improving stiffness in a specific frequency band. A displacement of a rotor 2 detected by a displacement detector 30 is entered to a switcher 32. On the other hand, a rotational speed sensor 7 detects the revolving speed, and a compensator switching discriminator 26 causes a switch 32s of the switcher 32 to connect to an output terminal 32b or to an output terminal 32c when the revolving speed coincides with preset revolving speed data. The preset revolving speed data defines specific revolving speeds occurring below and above a frequency band which includes a first conical mode resonant frequency and a second conical mode resonant frequency. The position of the rotor 2 is adjusted by a magnetic bearing 38 based on an output of the PID control circuit 12.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.