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:
Sep. 19, 1989
Filed:
Jul. 05, 1988
Timothy F Glennon, Rockford, IL (US);
William E McCracken, Elmhurst, IL (US);
Sundstrand Corporation, Rockville, IL (US);
Abstract
An electrically compensated constant speed drive includes a mechanical differential having first and second input shafts and an output shaft wherein a prime mover is coupled to the first input shaft, a brushless generator is coupled to the differential output shaft and includes a control permanent magnet generator (PMG) and a main generator which develops output power and a speed compensation link is coupled between the control PMG and the second differential shaft. The speed compensation link includes a dynamoelectric machine coupled to the second differential input shaft and a power converter which interconnects armature windings of the control PMG and electrical power windings of the dynamoelectric machine. A generator control unit controls the flow of power between the control PMG and the dynamoelectric machine so that the dynamoelectric machine develops compensating speed of a magnitude sufficient to maintain the output shaft of the differential at a desired speed so that the brushless generator develops constant frequency AC power. The present constant speed drive is lighter and smaller than prior electrically compensated constant speed drives.