Patent · US Expired

Circuit and process for regulating the speed of universal electric motors

US6741803B2 · kind B2 · utility

7Cited by

9References

7Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Claus Osselmann · Kaltenberg, DE
Peter Hellmann · Obermeitingen, DE
Lutz Troeder · Fürstenfeldbruck, DE

Key dates

Filing date	Aug 29, 2002
Grant date	May 25, 2004
Priority date	—
Expiry date	Aug 29, 2022

Classification

Technology area (CPC H)Electricity
CPC primaryH02P29/60
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A process and a circuit (2) for regulating the speed of an electric motor (1) having a high speed (N1) to at least one additional lower speed (N2, N3, N4), whereby, in a first prioritized step, depending on a preselected speed (N1, N2), the regulation of the speed to a lower effective motor voltage (Ueff) has an upper limit, and in a second step, depending on the torque (M) needed for the regulation to this preselected speed (N1, N2), the effective motor voltage (Ueff) is regulated within the limited range.

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