Patent ID: 6433453
Filing Date: 2002-08-13
Classification: H02K

Abstract:
A revolving speed increasing apparatus comprising:a rotary shaft supported on a support structure so as to be rotatable in a rotation direction; a rotary plate fixed on said rotary shaft so as to be rotatable therewith; a fixed plate fixed to said support structure and having a surface that is opposed to a surface of said rotary plate; a plurality of elongated magnets radially arranged at equal intervals on the opposing surfaces of said rotary and fixed plates; a plurality of demagnetizing magnets fixed at the tips of said elongated magnets, respectively, each of said demagnetizing magnets being provided on one side of said respective elongated magnet so as to protrude from the ends of said respective elongated magnet, wherein said demagnetizing magnets on said rotary plate are fixed on a front side of said elongated magnets with respect to the rotation direction of said rotary shaft, and wherein said demagnetizing magnets on said fixed plate are fixed on a rear side of said elongated magnets with respect to the rotation direction of said rotary shaft; a plurality of plate magnets arranged between said elongated magnets that are disposed adjacent to each other on each of said rotary and fixed plates, respectively, wherein said elongated, demagnetizing and plate magnets on said rotary plate are permanent magnets, wherein said elongated, demagnetizing and plate magnets on said fixed plate are permanent magnets, wherein said rotary plate and said fixed plate are positioned so that a gap is formed between tip surfaces of said demagnetizing magnets on said rotary plate and opposing tip surfaces of said demagnetizing magnets on said fixed plate, and wherein poles at opposing tip surfaces of said elongated magnets on said rotary plate and said fixed plate are of the same polarity, and the number of said elongated magnets on said rotary plate is different from the number of said elongated magnets provided on said fixed plate.