H - Electricity – 02 – P
Patent
H - Electricity
02
P
322/3, 322/5, 31
H02P 9/10 (2006.01) H02K 47/20 (2006.01)
Patent
CA 1245716
ABSTRACT A compact, high efficiency non-interruptive motor generator power system for generating and supplying to a load A.C. 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 inertia 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. At all rotor speeds, only single phase A.C. potential of a precise desited frequency, phase, and predetermined magnitude is generated and conveyed to the excitation coil of the generator, so that the magnetic poles are produced in the layer of the permanent magnetic material of a precise pattern and a desired magnetic flux strength so that the power windings thereof generate A.C. of a desired frequency and voltage regardless of speed variations. The generator portion preferably comprises two or more stator sections having common power windings so that each generates identical single phase A.C. and the A.C. phases of at least on section can be phase-shifted so that when the A.C. output of all sections are combined, close control of the total A.C. voltage output is obtained.
503295
Barber Ronnie J.
Roesel John F. Jr.
Gowling Lafleur Henderson Llp
Precise Power Corporation
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