Levitation heating using single variable frequency power supply
US4578552A · kind A · utility
26Cited by
5References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 1, 1985 |
| Grant date | Mar 25, 1986 |
| Priority date | — |
| Expiry date | Aug 1, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B6/32
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A levitation heating system uses only a single power supply for both levitation and heating, but permits the frequency of the power supply to be changed to control heating effects independently of levitation forces. The levitation force is kept constant by changing the apparent impedance of the induction and levitation coil as the frequency is changed, thereby providing a constant applied current to the coil over a range of applied frequencies. Feedback is employed to assure constant current in the coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.