Sundstrand Corporation

Other

Robert C Baker

Bryan W Dishner

Prior generating systems utilizing electrically-compensated constant speed drives (ECCSD) have typically required a separate starter motor for starting a prime mover which supplies motive power to the ECCSD, thereby increasing the size and weight of the system. In order to overcome this problem, a generating system is provided with circuitry coupled to the electrical power windings of a permanent magnet machine (PMM) forming a part of the ECCSD for causing the PMM to develop motive power which causes an output shaft of a differential of the ECCSD to rotate at increasing speeds. When the output shaft of the differential reaches a predetermined speed, a generator coupled to the output shaft of the differential is supplied external or ground power which in turn causes the generator to operate as a motor and return motive power through the differential to the prime mover to start same and bring it up to operating speed.

Starting system for an electrically-compensated constant speed drive

An emergency power generating system according to the present invention includes an emergency power converter which is selectively coupled to the output of a permanent magnet machine forming a part of a constant speed drive in the event of a failure of a main generator so that the permanent magnet machine and the emergency power converter provide emergency power to one or more loads.

Emergency power system

The new composite flexible sheet material comprises a base sheet structure made up of a thermoplastic resin layer which is flowable or fusible at predetermined sealing conditions, plus a polyester backing layer non-flowable or non-fusible at said conditions. The thermoplastic layer is thicker than the backing layer. Adhered to the thermoplastic layer is a layer of polyester fibrous material not flowable or fusible at said sealing conditions. The fibrous material layer is capable of being substantially submerged into the thermoplastic layer upon the application of sealing conditions. A preferred invertible envelope-type packet is formed by using a composite sheet having a thermoplastic fusible layer and a non-fusible backing layer, and involves placing the thermoplastic layer inwardly and the backing layer on the exterior of the envelope. Opposing walls of the envelope are united along portions thereof adjacent the envelope cavity. The expanse of the sheet material forming each opposing wall extends beyond a seal structure along one edge of the envelope cavity to form a pair of outwardly projecting ear-flaps. Sheet material forming one of the ear-flaps is folded back upon itself over the thermoplastic layer side thereof. Part of this folded back portion extends as a partition member substantially throughout the seal structure along the one edge; and this seal structure along said one edge is temporary and rupturable at the interface between the backing layer of the partition member and the thermoplastic layer of the opposing sheet.

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Loves Park, IL, United States of America

Robert C Baker