Magnet with multiple opposing poles on a surface for use with magnetically sensitive components
A system for inductive charging is provided. In accordance with an embodiment, the system comprises a permanent magnet structure having two or more discontinuous permanent magnet sections assembled to form a full or partial ring shape. The sections are each magnetized in a direction perpendicular to their top and bottom surfaces in a pattern comprising multiple opposing poles at each surface to reduce an effect of a magnetic field generated by the permanent magnet structure on magnetically sensitive components of the portable device or battery or other nearby devices.
1. A portable device or battery capable of receiving inductive power from an inductive charger or power supply including a substantially planar charger coil, the portable device or battery forming a part or whole of a system, the system comprising:
a substantially planar inductive power receiver coil; and
a permanent magnet structure forming a substantially flat ring defining opposing top and bottom substantially flat surfaces,
wherein the permanent magnet structure comprises two or more discontinuous permanent magnet sections assembled to form a full or partial ring shape,
wherein the two or more discontinuous permanent magnet sections are each magnetized in a direction perpendicular to their top and bottom substantially flat surfaces in a pattern comprising multiple opposing poles at each surface to reduce an effect of the magnetic field generated by the permanent magnet structure on magnetically sensitive components of the portable device or battery or other nearby devices; and
wherein the permanent magnet structure is attached or incorporated in the portable device or battery around the receiver coil and assists in providing alignment of the receiver coil with a charger coil for power transfer when placed on an inductive charger or power supply comprising a compatible permanent magnet structure.
2. An inductive charger that forms a part or whole of a power system to inductively charge or power a portable device or battery including a substantially planar receiver coil, the power system comprising:
a substantially planar inductive charger coil; and
a permanent magnet structure forming a substantially flat ring defining opposing top and bottom substantially flat surfaces, wherein the permanent magnet structure:
comprises two or more discontinuous permanent magnet sections assembled to form a full or partial ring shape;
wherein each section is magnetized in a direction perpendicular to its top and bottom substantially flat surfaces in a pattern comprising multiple opposing poles at each surface to reduce an effect of the magnetic field generated by the permanent magnet structure on magnetically sensitive components of the portable device or battery during inductive charging; and
is attached or incorporated in the charger or power system around the charger coil to assist in providing alignment of a receiver coil comprising a compatible magnetic structure when placed on the charger or power system at any rotational relative orientation for power transfer.
3. A case, protective cover, pouch, wallet or money clasp for use with a portable device, with the case, protective cover, pouch, wallet, or money clasp forming a part or whole of a system, the system comprising:
a permanent magnet structure forming a substantially flat ring defining opposing top and bottom substantially flat surfaces, wherein the permanent magnet structure:
comprises a full ring, or two or more discontinuous permanent magnet sections are assembled to form a full or partial ring shape;
wherein the full ring or each section is magnetized in a direction perpendicular to its top and bottom substantially flat surfaces in a pattern comprisnig multiple opposing poles at each surface to reduce an effect of the magnetic field generated by the permanent magnet structure on magnetically sensitive components of the portable device during use or nearby devices or components; and
is attached or incorporated in the case, protective cover, pouch, wallet, or money clasp for attaching or aligning the case, protective cover, pouch, wallet, or money clasp to a corresponding permanent magnet structure in the portable device.
4. The system of claim 1 , 2 or 3 , further wherein the permanent magnet structure is magnetized in a direction perpendicular to its top and bottom substantially flat surfaces near its inner diameter and near its outer diameter, with a magnetization direction at its inner diameter in an opposite direction to a magnetization direction at its outer diameter.
5. The system of claim 1 , wherein the system is a mobile phone which further includes a magnetic sensor that detects the presence of a compatible permanent magnet structure in an inductive charger or phone case, holster, or other holder and whereupon the mobile phone takes certain actions that have been selected by the user.
6. The system of claim 2 , further wherein the charger or power supply comprising the permanent magnet device is incorporated into a second portable device such as a laptop, phone or notebook and wherein the dimensions and the magnetization strength of the permanent magnet structure is further optimized to reduce an effect of a stray magnetic field on the compass, camera, speakers, disk drive, inductive charging or other magnetically sensitive components of the second portable device or the charger.
7. The power system of claim 2 , wherein the system is designed for use in a car or other vehicle including trains, airplanes, boats, ships, helicopter, etc. where motion is present and wherein the dimensions and the magnetization strength of the permanent magnet structure is further optimized to securely hold a portable device and reduce an effect of a stray magnetic field from the permanent magnet structure on the inductive charger or power system, any portable device or battery being charged, or the car or other vehicle.
8. The system of claim 4 , furthermore comprising one or more rectangular or square permanent magnet sections having top and bottom substantially flat surfaces, wherein the rectangular or square permanent magnet sections are magnetized in a direction perpendicular to their top and bottom substantially flat surfaces in a pattern comprising multiple opposing poles at each surface and are incorporated into the system to enable the permanent magnet structure in the portable device or battery to align with a compatible permanent magnet structure and magnet section in a charger or case, protective cover, pouch, wallet or money clasp in a specific rotational relative orientation.
9. The system of claim 4 , further wherein the permanent magnet structure comprises Boron, Nickel, Iron, Cobalt, Aluminum, Neodymium or another rare earth metal, and is coated to avoid corrosion.
10. The system of claim 4 , further comprising a gap or discontinuity in one or more locations in the ring to reduce eddy current generation in the permanent magnet structure during inductive power transfer.
11. The system of claim 4 , wherein the dimensions of the permanent magnet structure and its magnetization strength is further optimized to reduce the effect of the magnetic field on a compass, camera, speakers, disk drive, inductive charging or other magnetically sensitive components of the portable device during use.
12. The system of claim 4 , further wherein the permanent magnet structure is manufactured to be flexible.
13. The system of claim 4 , further comprising a backing piece of ferromagnetic material consisting of iron, steel or nickel or alloys thereof to further reduce the effect of the magnetic field of the permanent magnet structure on nearby magnetically sensitive components.
14. The system of 4 , further comprising a magnetic shield layer composed of ferromagnetic materials or alloys of ferromagnetic materials to shield the charger or the portable device or battery from a DC magnetic field of the permanent magnet structure or an AC magnetic field resulting from charger and receiver coils during power transfer.
15. The system of claim 4 , further comprising a magnetic shield layer composed of nano crystalline magnetic material to shield the charger or the portable device or battery from a DC magnetic field of the permanent magnet structure or an AC magnetic field resulting from charger and receiver coils during power transfer.
16. The system of claim 4 , further comprising a heat transfer layer to spread heat generated during inductive power transfer while avoiding eddy current loss in the layer.
17. The system of claim 4 , further comprising a metallic heat transfer layer to help spread the heat generated during inductive power transfer.
18. The system of claim 17 , further wherein the metallic heat transfer layer is discontinuous in one or more locations to reduce the effect of circulating eddy currents in the metallic layer during inductive power transfer.
19. The system of claim 4 , wherein the dimensions and the magnetization strength of the permanent magnet structure is further optimized to reduce an effect of a stray magnetic field on a credit card or debit card magnetic strip when placed near the apparatus.
20. A permanent magnet having top and bottom substantially flat surfaces for use in cases, purses, wallets, handbags, backpacks, clothing, footwear, automotive or other transport applications which may be used in the vicinity of a magnetically sensitive component or device wherein the permanent magnet is magnetized in a direction perpendicular to its top and bottom substantially flat surfaces in a pattern comprising multiple opposing poles at each surface to reduce an effect of a magnetic field generated by the permanent magnet on a nearby magnetically sensitive device or product such as an electronic component or sensor, compass, speaker, disk drive, portable device, credit card, or debit card.