Method and apparatus for precisely controlling the periodic motion of an object
US5754048A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 17, 1996 |
| Grant date | May 19, 1998 |
| Priority date | — |
| Expiry date | Jul 17, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/307
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus precisely controlling the periodic motion of an object is specifically applicable to the control of the rotation of a nuclear magnetic resonance (NMR) spectrometer rotor, and uses a fluid source having a fluid output with a time-varying magnitude. The output of the fluid source is coupled to a stator housing within which the rotor is rotatably disposed such that the time varying fluid pressure from the fluid source impinges upon a plurality of vanes located about a circumference of the rotor. The coupling of the fluid flow to the rotor results in a periodicity of the rotor rotation being proportional to a periodicity of the time varying magnitude of the fluid flow. This, in turn, creates a plurality of stable equilibrium rotation rates at which a frequency locking effect is achieved that tends maintain the rotor periodicity at a predetermined rate, thereby achieving particularly precise and stable rotor rotation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.