Patent ID: 6795564
Filing Date: 2004-09-21
Classification: H04R

Abstract:
A converter with two coils and two magnetic gaps comprising the magnetic path of permanent magnet and the frame integral with it, two coaxial annular magnetic gaps of the same diameters and a bobbin inserted into the magnetic gap on which the insulated wiring is parallelly wound to form two coils is characterized in that:a) The upper and lower yokes of the said magnetic path are two coaxial and symmetric innerwardly concave plates made of magnetic material on the outer central portion of which a boss face is provided with a shaft hole which usually is a round hole, but can be a square or hexagonal hole; b) The convex peripheral pole shoes are formed on the inner peripheries of the said upper and lower yokes, and a piece or more of the permanent magnets uniformly spaced with equal thickness and axial magnetization is provided between the pole faces of two peripheral pole shoes; c) A hollow frame of non-magnetic material is embedded and bound to the inner face of the concave plates of the said upper and lower yokes with the inner vertical face of the permanent magnet mounted and bounded to the inner vertical face of the hollow frame; d) Two pole faces of the said permanent magnet are engaged with the upper yoke and two pole faces of the peripheral pole shoes of the lower yoke; and a outer core of an integral magnetic path is formed by means of the through holes formed on the said boss faces of the upper and lower yokes, associated threaded holes, and the static pressure applied to the engaging pole faces by non-magnetic fasteners; e) Two coaxial annular magnetic gaps of the same diameter are formed between the outer peripheric of the annular or cylindrical magnetic body coaxial with the central hole of the inner concave plates of the upper and lower yokes and the vertical peripheric of the central holes of the upper and lower yokes, also two coaxial coils are inserted into the said annular magnetic gap, while wound direction of two coils and the direction of current produce an electrodynamic force Fin the coils in the same moment and same direction; f) With the dividing bisectrix xâ€”x of half the axial highness of the said permanent magnet as the horizontal symmetric axis the said converter with two coils and two magnetic gaps has the symmetric magnetic path in geometry and magnetic characteristics, also the two coils have opposite wound directions after connecting in series while the section area of the wiring of the two coils, their turns and absolute value of the inductance are equal to each other with the said converter being a mechanic-electrical converter with resistance load characteristics. g) The said coils and the central hole of the said inner concave plate are matched with the said annular or cylindrical magnetic body, with its optimum section being hexagonal and a short symmetric are provided on the top of inner corners of the hexagon or regular polygon while the arc is tangential to both sides of the inner corner and its center is located on the dividing line of the inner corner; h) More than two uniformly spaced inner concave convection holes are provided on the peripheric pole shoes of the upper and lower yokes with the deepest bottom leveled with the inner face of the said inner concave plate; i) Adhesive between the upper and lower yokes as well as the permanent magnet and the said hollow frame is cured after the outer core of the magnetic path has been assembled.