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:
Apr. 17, 2012
Filed:
Nov. 26, 2008
Marcello Sciuto, S. Giovanni in Persiceto, IT;
Sergio Vigna, Turin, IT;
Piero Carbonaro, Turin, IT;
Francesco Del Mese, Casalecchio di Reno, IT;
Marcello Sciuto, S. Giovanni in Persiceto, IT;
Sergio Vigna, Turin, IT;
Piero Carbonaro, Turin, IT;
Francesco Del Mese, Casalecchio di Reno, IT;
Magneti Marelli Powertrain S.p.A., Corbetta, IT;
Abstract
A method for controlling an electric motor by using the PWM technique including the steps of: applying to the clamps of the electric motor an electric voltage varying in time, which displays a square waveform and consists of a sequence of pulses having a uniform wave period and a variable width; adjusting the average value of the electric voltage by varying the width of the pulses; determining the overall required width variation; subdividing the overall required width variation in a determined number of partial variations, the overall sum of which is equivalent to the overall required width variation; and gradually varying the width amplitude of the pulses of the electric voltage by applying in a sequence a corresponding partial variation to each pulse, so that the difference between the width amplitude of a pulse and the width of a following pulse is equivalent to the corresponding partial variation.