Patent ID: 6885272

Claim:
A permanent magnetic core device for use as a transformer, inductor, choke, or a component in a current limiting circuit, comprising: first and second layers of magnetic conductive material retained in a predetermined, spaced apart relationship with respect to one another, so as to define opposed facing surfaces, at least at first and second end portions thereof, and a gap between said layers; a first permanent magnetic piece located at said first end portion between said first and second layers of ferromagnetic material, and a second permanent magnetic piece located at a second end portion between said first and second layers of magnetic conductive material, the first and second permanent magnetic pieces being placed so that their fields are additive; a first magnetic pole pieces positioned between the first layer of the magnetic conductive material and a second magnetic pole piece positioned between the second layers of the magnetic conductive material on each side of the respective first and second permanent magnet pieces, and; coil means surrounding each of said first and second layers of magnetic conductive material, said coil means extending within said gap between said first and second permanent magnetic pieces and being placed so that fields produced by the coil means are additive.