Patent · US Expired

Drive unit

US6812658B2 · kind B2 · utility

1Cited by

11References

6Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Richard Vogt · Kehl, DE
Jochen Goehre · Karlsruhe, DE
Thomas Helming · Baden-Baden, DE

Key dates

Filing date	Dec 31, 2002
Grant date	Nov 2, 2004
Priority date	—
Expiry date	Dec 31, 2022

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02B30/70
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A drive unit, in particular for a fan in motor vehicles, is indicated, comprising an electric motor (12) operated on a DC line (UBat), and comprising a device (13) for controlling the speed of the motor (12) by changing the operating voltage applied at the motor (12). In order to cost-effectively realize a stepwise adjustment of the motor speed, the speed control device (13) comprises a plurality of resistors (R1-R3) and a plurality of semiconductor switches (T1—T3) for selectively connecting the motor (12) in series with at least one of the resistors (R1-R3)

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