Patent · US Expired

Phase-saving lowpass filters for drive control in conjunction with a high level of control dynamics

US6940247B2 · kind B2 · utility

1Cited by

0References

6Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Elmar Schaefers · Nuremberg, DE
Hans-Peter Troendle · Forchheim, DE

Key dates

Filing date	Jul 31, 2001
Grant date	Sep 6, 2005
Priority date	—
Expiry date	Dec 12, 2021

Classification

Technology area (CPC H)Electricity
CPC primaryH02P23/16
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The PDT2 filtering element (PDT2) and a Cauer filter (C2) are employed for use in control tasks of automation engineering, in particular for a filter connected downstream of a rotational speed controller. For tasks in control engineering, these have the advantage of a higher level of robustness, since a large frequency range is filtered, and a substantially smaller phase drop than conventional lowpass filters (PDT2). Consequently, by comparison with the known prior art a loss in dynamics is substantially minimized with these phase-saving lowpass filters, and an optimum is achieved in robustness and dynamics.

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