The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 02, 2004
Filed:
Dec. 31, 2002
Applicant:
Inventors:
Assignee:
Robert Bosch GmbH, Stuttgart, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K 2/900 ;
U.S. Cl.
CPC ...
H02K 2/900 ;
Abstract
A drive unit, in particular for a fan in motor vehicles, is indicated, comprising an electric motor ( ) operated on a DC line (U ), and comprising a device ( ) for controlling the speed of the motor ( ) by changing the operating voltage applied at the motor ( ). In order to cost-effectively realize a stepwise adjustment of the motor speed, the speed control device ( ) comprises a plurality of resistors (R -R ) and a plurality of semiconductor switches (T —T ) for selectively connecting the motor ( ) in series with at least one of the resistors (R -R )