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The Invention comprises a versatile AC dynamo-electric machine comprising isolated dual stators, each both concentrated windings energizable with single-phase AC, and main windings and a single high inertia sleeve and drive place connected to a rotor shaft. The sleeve contains independent electrical

The Invention comprises a versatile AC dynamo-electric machine comprising isolated dual stators, each both concentrated windings energizable with single-phase AC, and main windings and a single high inertia sleeve and drive place connected to a rotor shaft. The sleeve contains independent electrical rotors, one for each stator. Each rotor has an innermost layer of magnetizable permanent magnetic material in which the concentrated coils in the stator produce a desired pattern of magnetic poles reacting with the rotating field of the main windings. The machine can function as a synchronous AC motor, or a constant frequency output dual AC generator or as an AC motor-generator with long ride-through time. A UPS system comprises the machine in the motor-generator mode, with clutch means to connect an engine to the rotor shaft to start the engine.

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[ We claim:] [1.] A versatile dynamo-electric machine comprising:a machine casing having a cylindrical inner bore extending from one end to the other and end bells attached to each end of said casing to form an enclosed housing;two annular ring shaped independent stators, each stator having one inne

[ We claim:] [1.] A versatile dynamo-electric machine comprising:a machine casing having a cylindrical inner bore extending from one end to the other and end bells attached to each end of said casing to form an enclosed housing;two annular ring shaped independent stators, each stator having one inner end affixed to and supported by the casing end bells for transfer of heat from said stators to said casing, and having an opposite end extending inwardly from said end bells into the cylindrical bore so as to define an axial separation space therebetween, each stator having a central axial aperture extending therethrough;each stator having an outer cylindrical surface coaxial with said bore axis and having axially disposed slots formed thereon, each stator having a main electrical winding positioned in most of said slots, and at least one core containing at least one pair of adjacent slots with a concentrated winding in the pair of adjacent slots, electrical leads to the concentrated windings connected to a source of single phase AC through its leads, and leads to the main windings configured for connection to at least one of a source of AC power and a load, said main windings being arranged in said core slots to produce a rotating magnetic field when energized by AC current;a rotor shaft disposed within and coaxially of said bore, first and second bearings for rotatably supporting said rotor shaft, one of said bearings affixed to each of said end bells with at least one end of said shaft extending to the exterior of the casing, said rotor shaft passing through said central axial aperture of said stator cores with a clearance space therebetween;a circular metal drive plate being affixed to said rotor shaft and extending radially outwardly at said axial separation space between said stators;two circular cylindrical sleeves formed around the outer periphery of said stators, one sleeve being attached to each side of the periphery of said drive plate and defining a small clearance space between the inner surface of said bore and the outer surface of said sleeves, said sleeves respectively defining two independent electrical rotor elements, one for each of said stators, each of said stators being electrically and magnetically isolated from the other stator by the assembly of the circular metal drive plate, the cylindrical sleeves and said shaft; anda layer of magnetizable permanent magnetic material supported within each of said sleeves and having an exposed innermost cylindrical surface substantially coextensive with and closely spaced to the outer cylindrical surface of each of said stators.