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. 28, 2007
Filed:
Jul. 29, 2004
Khwaja M. Rahman, Torrance, CA (US);
Silva Hiti, Redondo Beach, CA (US);
Nitinkumar R. Patel, Cypress, CA (US);
Terence G. Ward, Redondo Beach, CA (US);
James M. Nagashima, Cerritos, CA (US);
Fabio Crescimbini, Rome, IT;
Federico Caricchi, Rome, IT;
Khwaja M. Rahman, Torrance, CA (US);
Silva Hiti, Redondo Beach, CA (US);
Nitinkumar R. Patel, Cypress, CA (US);
Terence G. Ward, Redondo Beach, CA (US);
James M. Nagashima, Cerritos, CA (US);
Fabio Crescimbini, Rome, IT;
Federico Caricchi, Rome, IT;
General Motors Corporation, Detroit, MI (US);
Abstract
Methods and apparatus are provided for an electric vehicle embodying an axial flux traction motor directly coupled to a wheel thereof. The fraction motor includes a stator having coils for producing a magnetic field, an annular rotor magnetically coupled to the stator and mechanically to an output shaft Permanent magnets of alternating polarity are mounted on the annular rotor. Magnetic shunts bridge a portion of the stator slots above the coils. The magnets are arranged in groups with group-to-group spacing exceeding magnet-to-magnet spacing. Adjacent edges of the magnets diverge. The method comprises, looking up d- and q-axis currents to provide the requested torque and motor speed for the available DC voltage, combining at least one of the d- and q-axis currents with a field weakening correction term, converting the result from synchronous to stationary frame and operating an inverter therewith to provide current to the coils of the motor.