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:
Jul. 22, 2003
Filed:
Nov. 15, 2001
Applicant:
Inventors:
Andrew Paul Smith, Ontario, CA;
Martin Volkening, Ontario, CA;
Assignee:
Siemens VDO Automotive Inc., Mississauga, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P 1/18 ;
U.S. Cl.
CPC ...
H02P 1/18 ;
Abstract
A motor speed control system includes a permanent magnet direct current electric motor A first switch is operatively associated with the motor. A resistive element is provided in series with the motor and the first switch. A second, pulse width modulated controlled, switch is operatively associated with the motor. A controller is operatively associated with the first and second switches for controlling the first and second switches independently and in combination to control current to the motor to operate the motor at various speeds.