Portable apparatus for generating an induced low-frequency sinusoidal electric current
A portable apparatus for generating an induced low-frequency sinusoidal electric current in an area of the human body includes four angular magnet sectors inscribed within the same circle, centered on the same axis of rotation, and spaced angularly apart from one another. The polarity of two adjacent angular magnet sectors is opposed, and a motor for rotating at a predetermined speed the angular magnet sectors is about the axis of rotation to generate an induced sinusoidal current at a predefined frequency. Each angular magnet sector includes the same geometrical shape with an internal angular opening of 90°, an external angular opening between 20° and 50°, and two lateral edges defining a radius extending over a distance, which is between one-third and two-thirds of a distance separating the axis of rotation from the free end of the magnet sectors.
1. A portable apparatus for generating an induced low-frequency sinusoidal electric current in an area of a human body, the apparatus comprising:
four angular magnet sectors which are inscribed in within a same circle, are centered on an axis of rotation and spaced angularly apart from one another, the polarity of two adjacent angular magnet sectors being opposed; and
means for rotating the angular magnet sectors at a predetermined speed about the axis of rotation such as to generate an induced sinusoidal current at a predefined frequency;
wherein each said angular magnet sector comprises a same geometrical shape with an internal angular opening at a level of the axis of rotation of 90°, an external angular opening at a level of a free end opposite the axis of rotation between 20° and 50°, and two lateral edges defining a radius extending by a distance which is between one-third and two-thirds of a distance separating the axis of rotation from the free end of the angular magnet sectors.
2. The apparatus according to claim 1 , wherein the external angular opening of each said angular magnet sector is 45°.
3. The apparatus according to claim 1 , wherein the distance separating the axis of rotation from the free end of each said angular magnetic sector is 60 mm, a join radius defined by the lateral edges of the angular magnet sectors extending over a distance of 40 mm.
4. The apparatus according to claim 1 , wherein the angular magnet sectors have a substantially constant thickness.
5. The apparatus according to claim 4 , wherein the angular magnet sectors have a thickness between 2 mm and 15 mm.
6. The apparatus according to claim 1 , wherein the angular magnet sectors have a thickness that is variable between the axis of rotation and the free end thereof.
7. The apparatus according to claim 6 , wherein the thickness of the angular magnet sectors is decreasing from the axis of rotation between a maximum thickness and a minimum thickness.
8. The apparatus according to claim 7 , wherein each said angular magnet sector has a rear face substantially perpendicular to the axis of rotation and a front face opposite the rear face which is inclined with respect to the rear face.
9. The apparatus according to claim 1 , further comprising a magnetic circuit layer disposed on a back of the angular magnet sectors.
10. The apparatus according to claim 9 , wherein the magnetic circuit layer is made of soft steel.
11. The apparatus according to claim 1 , further comprising a magnetic shielding layer disposed around the angular magnet sectors.
12. The apparatus according to claim 11 , wherein the magnetic shielding layer is made of nickel-iron alloy.