Patent · US Expired

Circuit for operating an electric motor

US7015671B2 · kind B2 · utility

2Cited by

14References

7Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Norbert Knab · Appenweier, DE
Thomas Asal · Horben, DE
Nikolas Haberl · Baden-Baden, DE

Key dates

Filing date	Oct 14, 2002
Grant date	Mar 21, 2006
Priority date	—
Expiry date	Dec 28, 2022

Classification

Technology area (CPC H)Electricity
CPC primaryH02P1/18
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A circuit configuration for operating an electric motor is described, the circuit configuration containing a timer. As a function of a first differential signal between a setpoint signal and an actual value signal, a regulator supplies a first switch signal for feeding current to the electric motor. Simultaneously, the timer is started which limits the current feed signal to a specified maximum time. A detection system detects a change in the setpoint signal and thereupon outputs a second switch signal that also starts the timer and is able to trigger the current feed to the electric motor. The circuit configuration both protects the electric motor from a thermal overload and also makes it possible to feed current to the electric motor if a setpoint changes. The circuit configuration is suitable to be used in a variable speed drive.

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