Force-measuring device using electromagnetic force compensation with constant power dissipation
US8309867B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 2010 |
| Grant date | Nov 13, 2012 |
| Priority date | — |
| Expiry date | Apr 15, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01G7/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A force-measuring device 1, particularly a balance, operates on the principle of electromagnetic force-compensation. An electric coil 53 is arranged to be movable in a magnet system 50. The coil has at least two windings W1, W2 and a current supply device PB having at least two partial current sources PB1, PB2, the current sources each assigned to a corresponding winding. A device CU controls and/or regulates the current supplied to the windings by the partial current sources in such a way that, dependent on a force L acting on the force-measuring device, a current I1, I2 is sent through each of the windings. The sum of the at least two electromagnetic forces which are thereby generated forms the compensation force, while, at the same time, the power dissipated by the coil always takes on a given predetermined value Ptg.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.