Patent · US Active

Method of controlling a motor

US7791297B2 · kind B2 · utility

7Cited by

5References

7Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Thomas Mueller · Oberkochen, DE
Johannes Stempfhuber · Utting am Ammersee, DE
Germar Meiendres · Landsberg, DE
Konstantin Baxivanelis · Kaufering, DE
Markus Looser · Weilheim, DE

Key dates

Filing date	Aug 30, 2007
Grant date	Sep 7, 2010
Priority date	—
Expiry date	Apr 19, 2028

Classification

Technology area (CPC H)Electricity
CPC primaryH02P29/032
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method for controlling a motor (2) which drives a disk-shaped tool (4) of a power tool (1) and to which a motor voltage in the amount of a nominal value is applied in an “on” position of a motor switch (6), includes determination of an actual motor current (IM) applied to the motor (2) and comparing it to a first predetermined threshold (GW1), and automatically triggering of a control process for protecting the motor (2) when an overload condition which is defined in that the first predetermined threshold (GW1) is exceeded beyond a first predetermined limiting time period (grDt1), is met, the control process including reduction of the motor voltage applied to the motor (2) by a magnitude that can be perceived by the user as a choke value.

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