Patent 7944187 was granted and assigned to Pratt & Whitney Canada on May, 2011 by the United States Patent and Trademark Office.
Methods and apparatuses are disclosed for producing current with a desired output frequency from one or more fixed or variable speed alternators by varying a saturation level of a portion of the alternator(s) based on a output frequency desired, and preferably then rectifying the output to produce a desired electrical output which may be provided as direct current or alternating current to a suitable load.