초록 ▼

The invention comprises a versatile AC dynamo-electric machine (10) comprising isolated dual stators (50 and 50B and 50C), each both concentrated windings (53C) energizable with single-phase AC, and main windings (53) and a single high inertia sleeve (75) and drive plate (74 and 74A) connected to a

The invention comprises a versatile AC dynamo-electric machine (10) comprising isolated dual stators (50 and 50B and 50C), each both concentrated windings (53C) energizable with single-phase AC, and main windings (53) and a single high inertia sleeve (75) and drive plate (74 and 74A) connected to a rotor shaft (70-73A). The sleeve contains independent electrical rotors (80 and 80A), one for each stator. Each rotor has an innermost layer (82) 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 (a) as a synchronous AC motor, or (b) a constant frequency output dual AC generator or (c) as an AC motor-generator with long ride-through time. A UPS system (100) comprises the machine (10) in the motor-generator mode, with clutch means (124) to connect an engine (114) to the rotor shaft (73A) to start the engine.

대표청구항 ▼

[ We claim:] [1.] A versatile dynamo-electric machine comprising dual electrically isolated stators and a single rotor assembly unit having two independent electrical rotor elements, one for each of the stators, the two electrical rotor elements being attached to a single drive plate member mounted

[ We claim:] [1.] A versatile dynamo-electric machine comprising dual electrically isolated stators and a single rotor assembly unit having two independent electrical rotor elements, one for each of the stators, the two electrical rotor elements being attached to a single drive plate member mounted on a shaft, the dual stators and their electrical rotor elements capable of operating together either as an AC motor, or as an electrical AC generator, or as an AC motor-generator, comprisinga) a solid metal outer casing having a smooth-surfaced internal circular cylindrical inner bore extending from one end to the other of the casing, the walls of the cylindrical inner bore and the ends thereof forming an enclosing housing,b) two annular ring shaped independent stators, each stator having one inner end affixed to and supported by the casing walls at an inner end of the bore, whereby heat generated in each stator can flow to the walls of the casing, each stator having an end extending inwardly from the inner ends into the cylindrical bore and toward each other with an axial separation space between their ends, each stator having a central axial aperture extending therethrough, each stator having an annular core of low-loss magnetic material having an outer circular cylindrical surface coaxial with the bore axis with axially disposed slots in the surface, and having main electrical windings in most of the 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 main windings and to the concentrated windings passing through the walls of the casing, the concentrated windings being connectable to a source of single-phase AC through its leads by a control switch, and the leads to the main windings can be connected to either a source of AC power or to a load, the main windings being arranged in the core slots to produce a rotating magnetic field when energized by AC current,c) the rotor assembly comprising a rotor shaft disposed within and coaxially of the circular cylindrical bore and extending from one end to the other end of the bore, bearings for rotatably supporting the rotor shaft, the bearings being affixed to the casing walls at the ends of the bore, at least one end of the shaft extending to the exterior of the casing, the rotor shaft passing through the central axial aperture of both stator cores with a clearance space therebetween, a circular metal drive place member being affixed to the shaft and extending radially outwardly at the axial separation space between the stators, the drive plate member having an outer periphery close to the cylindrical inner bore of the casing and with a clearance space therebetween, two circular cylindrical sleeves, one sleeve being attached to each side of the periphery of the drive plate member, with a small clearance space between the inner bore of the casing and the outer surfaces of the sleeves, each sleeve extending over and surrounding one of the stator cores, the inner surface of each sleeve having affixed thereto an annular cylindrical layer of a low coercive force magnetic material, each layer having an inner surface of circular cylindrical shape on which is affixed a layer of magnetizable permanent magnetic material having an exposed innermost circular cylindrical surface substantially coextensive with and closely parallel to the outer cylindrical surface of the adjacent stator core with a small rotational clearance therebetween, each of the stators being electrically and magnetically isolated from the other stator by the assembly of the circular metal drive plate, the cylindrical sleeves and the shaft, and the assembly comprises a body of high rotational inertia, andd) the versatile dynamo-electric machine being characterized that either or both of the stator cores and its adjacent rotor are operable as(1) an AC motor when the leads to the main windings are connected to a source of AC power and produce a rotating magnetic field in the stator, and the leads to the concentrated windings are connected to a source of single-phase AC of the same frequency as the AC power and with the AC current flowing through the concentrated windings being sufficient to strongly magnetize the portion of the core between the adjacent slots in which the concentrated windings are placed to alternate north and south polarity of sufficient strength to magnetize the layer of magnetizable permanent magnetic material that rotates closely thereto into alternate and successive north and south magnetic poles that will react with the rotating magnetic field in the adjacent stator to cause the rotor to rapidly reach and maintain synchronous speed from stand-still or at speeds below synchronous speed of rotation, or(2) either or both stators and their associated rotors operate as an AC generator when the leads to the concentrated windings are connected through the controlled switch to a source of single-phase AC of the same frequency as desired by a load, the concentrated winding being supplied single-phase AC current of sufficient strength to magnetize the portion of the stator core between the adjacent slots to alternate north and south magnetic polarity of sufficient strength to magnetize the layer of magnetizable material on the rotor that rotates closely thereto into alternate successive north and south magnetic poles so that during rotation of the rotor it will produce an AC potential of the same frequency as in the excitation winding in the main electrical windings in the stator whereby the AC potential will be conveyed by the leads from these windings to the load, and(3) the machine being operable as a motor-generator, with one stator-rotor pair being operated as an AC motor for driving the rotor of the other stator-rotor pair for operation as an AC generator, the high rotational inertia of the rotor assembly enabling the AC generator pair to generate AC of a desired frequency for a prolonged period of time to a load when outside AC power to the motor-stator is interrupted.