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:
May. 14, 2002
Filed:
Jan. 17, 2001
Jean-Marie Laurent, Montesson, FR;
Sagem SA, Paris, FR;
Abstract
The motor has a stator and a rotor. One of the elements has coils constituting a three-phase winding and an electronic control module having inputs connected to rotor position sensors and to a speed reference signal (V ), and including a power circuit for powering the phases from a DC source under the control of a processor. The processor causes the phases to be powered at variable duty ratio so as to regulate speed in a first mode without overlap in time between the periods in which the various phases are powered with voltage pulses, and in a second mode in which there is 33% overlap of power to two phases, and it causes a changeover from the first mode to the second mode when the duty ratio reaches a predetermined value lying in the range 70% to 100%, and a changeover from the second mode to the first mode when the duty ratio falls below another predetermined value.