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. 21, 2013
Filed:
Jan. 03, 2011
Gabriel Gallegos-lopez, Lomita, CA (US);
Michael H. Kinoshita, Redondo Beach, CA (US);
Ray M. Ransom, Big Bear City, CA (US);
Milun Perisic, Torrance, CA (US);
Gabriel Gallegos-Lopez, Lomita, CA (US);
Michael H. Kinoshita, Redondo Beach, CA (US);
Ray M. Ransom, Big Bear City, CA (US);
Milun Perisic, Torrance, CA (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
Embodiments of the present invention relate to methods, systems and apparatus for controlling operation of a multi-phase machine in a vector controlled motor drive system when the multi-phase machine operates in an overmodulation region. The disclosed embodiments provide a mechanism for adjusting a duty cycle of PWM waveforms so that the correct phase voltage command signals are applied at the angle transitions. This can reduce variations/errors in the phase voltage command signals applied to the multi-phase machine so that phase current may be properly regulated thus reducing current/torque oscillation, which can in turn improve machine efficiency and performance, as well as utilization of the DC voltage source.