Patent · US Expired

Circuit for damping hunting by electric machines

US4393345A · kind A · utility

9Cited by

3References

10Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Kurt Fork · Neunkirchen, DE
Wolfgang Kaufhold · Recklinghausen, DE
Wolfgang Meusel · Herzogenaurach, DE
Hermann Waldmann · Radebeul, DE

Key dates

Filing date	Oct 22, 1980
Grant date	Jul 12, 1983
Priority date	—
Expiry date	Oct 22, 2000

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S505/851
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A circuit for damping hunting oscillations of controlled electric machines. The circuit is provided with a measuring circuit for determining the hunting oscillations and an identifier circuit for determining the angle components of such hunting oscillations. A phase shifter circuit is provided for receiving the angle components produced by the identifier circuit and forming a hunting oscillation correction signal which is shifted in phase from the hunting oscillations by a predetermined phase angle. The hunting oscillation correction signal is conducted to a control unit of the electric machine. The invention is particularly useful in damping hunting by the rotors of voltage controlled synchronous generators.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.