Method and apparatus for increasing the maximum speed of rotation of a synchronous machine with a given excitation field strength and terminal voltage
US4460860A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1983 |
| Grant date | Jul 17, 1984 |
| Priority date | — |
| Expiry date | Jan 14, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P2207/05
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for increasing the maximum speed of rotation of a synchronous machine having constant excitation field strength is disclosed. The synchronous machine is preceded by a converter, which has an adjusted current reference value as an input. The adjusted current reference value comprises an active-current reference value and a reactive-current reference value. For actual speeds n.sub.ist, the absolute value .vertline.n.sub.ist .vertline. of which is above a predetermined value n.sub.o, the amplitude of the active-current reference value is limited to a value which is inversely proportional to the factor .vertline.n.sub.ist .vertline./n.sub.o. The value n.sub.o is a predetermined speed at which the sum of the magnet wheel voltage of the synchronous machine and the voltage drop in the stator winding is maximally equal to the largest possible output voltage of the converter. To obtain the adjusted current reference value, a reactive-current reference value shifted 90.degree. relative to the active-current reference value is vectorially added to the active-current reference value, the amplitude of the reactive-current reference value being proportional to the factor …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.