A.C. motor-generator

Details A.C. motor-generator A.C. motor-generator

1985-03-04

1987-05-05

Roskoski, Bernard

Prime-mover dynamo plants

Electric control

318705, 318720, 318729, 318814, 290 45, H02P 528

Patent

active

046635360

ABSTRACT:
A compact, high efficiency non-interruptive motor generator power system for generating and supplying to a load A.C. of a substantially constant frequency and of a substantially constant voltage, the motor thereof being a synchronous A.C. motor energizable from a source of irregular and interruptible A.C. line power, the generator being capable of converting its rotational energy into the A.C. output for many seconds after interruption of the A.C. line power. The power system comprises a high efficiency, synchronous permanent magnet A.C. motor and an A.C. generator coupled to and driven by the motor. Both the motor and generator have a high rotational enertia common rotor wherein an outer cylindrical shell contains motor and generator rotor elements of high permeability soft magnetic material with a surface layer of magnetizable permanent magnetic material, and in each stator is an excitation coil, energizable with A.C., having a pole piece adjacent a layer of permanent magnetic material whereby to magnetize the layer into a selected pattern of north and south magnetic poles. The motor stator is within and encircled by the common rotor and has power windings producing a rotating magnetic field while the generator stator has windings for generating the A.C. power to the load during rotation of the so-magnetized rotor. Both stators also have feedback windings. In the motor stator, the feedback windings generate A.C. of a selected magnitude and phase which is conveyed by a resonant circuit to the excitation coil and there combined so as to provide energization thereof by A.C. of such strength and phase condition as to magnetize the layer of permanent magnetic material into the selected pattern. In the generator, the A.C. generated in the feedback windings is conveyed by an electrical circuit to the generator excitation coil which will essentially neutralize any A.C. induced therein by the magnetic field as the speed changes through the synchronous speed.

REFERENCES:
patent: 4095149 (1978-06-01), Wanlass
patent: 4168459 (1979-09-01), Roesel, Jr.
patent: 4190793 (1980-02-01), Parker et al.
patent: 4262209 (1981-04-01), Berner
patent: 4346303 (1982-08-01), Bukatarevic

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