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. 03, 2009
Filed:
Nov. 07, 2007
Connel Brett Williams, Leamington Spa, GB;
Jeffrey Ronald Coles, Solihull, GB;
Adrian Szabo, Solihull, GB;
Christopher David Dixon, Coventry, GB;
Jiang LI, Birmingham, GB;
Abbas Ahmad Fardoun, Dearborn, MI (US);
Connel Brett Williams, Leamington Spa, GB;
Jeffrey Ronald Coles, Solihull, GB;
Adrian Szabo, Solihull, GB;
Christopher David Dixon, Coventry, GB;
Jiang Li, Birmingham, GB;
Abbas Ahmad Fardoun, Dearborn, MI (US);
TRW Limited, , GB;
TRW Automotive US LLC, Livonia, MI (US);
Abstract
A drive system for a three phase brushless AC motor is arranged to optimize the transistor switching pattern to improve power output whilst allowing current measurement in all of the phases using a single sensor. This is achieved by defining voltage demand vectors x where more than two states are required to meet a minimum state time requirement determined by the single sensor method, and calculating three or more state vectors which produce the demanded vector x whilst still allowing single current sensing. Various methods of optimising the PWM pattern so as to give maximum output whilst using single current sensing are also disclosed.