Clean pump
US5350283A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1992 |
| Grant date | Sep 27, 1994 |
| Priority date | — |
| Expiry date | Nov 25, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K5/128
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a clean pump of the present invention, a magnetic coupling is formed by a permanent magnet attached to a rotor and a permanent magnet attached to an impeller, with a combined electromagnet arranged to be opposed to a soft iron member of the impeller at the side opposite to the rotor. The combined electromagnet is provided with a permanent magnet arranged at one side of its core and two coils wound around the permanent magnet. These coils are zero-power controlled by a control circuit based on outputs of position sensors such that the impeller is supported approximately at the center of a casing by an attracting force of the permanent magnets and an attracting force of the permanent magnet of the combined electromagnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.