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:
Aug. 06, 2013
Filed:
May. 08, 2009
Connel Brett Williams, Leamington Spa, GB;
Christopher David Dixon, Coventry, GB;
Jeffery Ronald Coles, Solihull, GB;
Robert James Huxford, Solihull, GB;
Connel Brett Williams, Leamington Spa, GB;
Christopher David Dixon, Coventry, GB;
Jeffery Ronald Coles, Solihull, GB;
Robert James Huxford, Solihull, GB;
TRW Automotive US LLC, Livonia, MI (US);
Abstract
A control system is provided for an AC electric motor which comprises a rotor and a stator and a plurality of phase windings connected in a star formation, each winding having one end connected to a common neutral point and another end arranged to have a terminal voltage applied to it. The control system comprises switching means arranged to control the terminal voltages applied to the windings and control means arranged to control the switching means so as to switch it between a plurality of states in each of a sequence of PWM periods. The control means is further arranged to measure the voltage at the neutral point at sample times within the PWM periods and to generate from the measured voltages an estimation of the rotational position of the rotor.