Centrifugal apparatus with overspeed protection
US5726881A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 1995 |
| Grant date | Mar 10, 1998 |
| Priority date | — |
| Expiry date | Aug 14, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB04B13/003
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A centrifugal apparatus includes a rotor having a marker for generating an index signal, a motor for rotating the rotor, first and second detectors for detecting the index signal with rotation of the rotor to generate first and second detection signals, an input terminal for receiving supply power, a drive circuit for generating a drive signal from the supply power according to the first detection signal, and first and second switch circuits for controlling the supply of the drive signal to the motor. First and second judging portions are used to detect whether the first and second detection signals are respectfully generated within a given condition. The first judging portion operates the first switch circuit to stop the drive signal from being supplied to the motor when the first detection signal is not generated within the given condition, while said second judging portion operates the second switch circuit to stop the drive signal from being supplied to the motor when the second detection signal is not generated within the given condition. The first and second detectors, judging portions, and switch circuits, respectively, independently operate to provide double feedback loops,…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.