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. 23, 1993
Filed:
Sep. 09, 1991
Chandra S Namuduri, Sterling Heights, MI (US);
Kalyan P Gokhale, Shelby Township, Macomb County, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A controller for a multi-phase brushless DC motor which pulse width modulates the switching devices of a bridge controller, thereby energizing the phase windings of the motor in such a manner as to eliminate current flow in the inactive phase windings. The bridge switching devices are modulated over distinct segments of the total conduction time. A pattern of modulation, constant conduction, and modulation is established which allows circulating current to flow only through active phase windings, effectively eliminating any undesirable braking torque resulting from current flow through inactive phase windings which lowers the overall motor efficiency.