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An apparatus includes an enclosure and a coil assembly in the enclosure. The coil assembly includes a magnetic core and a coil disposed on the magnetic core. The magnetic core is positioned adjacent a wall of the enclosure such that a direction of a main flux path in the magnetic core is through at

An apparatus includes an enclosure and a coil assembly in the enclosure. The coil assembly includes a magnetic core and a coil disposed on the magnetic core. The magnetic core is positioned adjacent a wall of the enclosure such that a direction of a main flux path in the magnetic core is through at least one portion of the wall having a magnetic permeability greater than air. Such an arrangement may be used for a wireless power receiver unit configured to be installed in an equipment rack in data center applications.

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1. An apparatus comprising: an enclosure configured to be installed in an equipment rack and comprising a wall;a coil assembly in the enclosure and comprising a magnetic core and a coil disposed on the magnetic core, the magnetic core positioned adjacent the wall such that a main flux path in the ma

1. An apparatus comprising: an enclosure configured to be installed in an equipment rack and comprising a wall;a coil assembly in the enclosure and comprising a magnetic core and a coil disposed on the magnetic core, the magnetic core positioned adjacent the wall such that a main flux path in the magnetic core is through at least one portion of the wall having a magnetic permeability greater than air, wherein the at least one portion of the wall comprises a region with a first magnetic permeability embedded in another component of the wall having a second magnetic permeability, and wherein the magnetic core is positioned adjacent the region such that the main flux path is directed through the region; anda wireless power receiver circuit in the enclosure, coupled to the coil and configured to be connected to at least one power bus in the equipment rack. 2. The apparatus of claim 1, wherein the at least one portion of the wall has a relative magnetic permeability greater than 1 and less than about 300. 3. The apparatus of claim 1, wherein the at least one portion of the wall comprises a plastic material having a magnetic material embedded therein. 4. The apparatus of claim 1, wherein the region comprises a plastic material formed in a space defined in the wall component. 5. The apparatus of claim 1, wherein the magnetic core comprises first and second legs positioned adjacent the wall such that first and second portions of the main flux path in respective ones of the first and second legs are directed through the at least one portion of the wall. 6. The apparatus of claim 5, wherein the at least one portion of the wall comprises first and second spaced apart regions and wherein the first and second portions of the main flux path are directed through respective ones of the first and second spaced apart regions. 7. The apparatus of claim 6, wherein the spaced apart first and second regions comprise respective first and second regions with a first magnetic permeability embedded in another wall component having a second magnetic permeability less than the first magnetic permeability. 8. The apparatus of claim 1, wherein the magnetic core is E-shaped and comprises first, second and third parallel legs, wherein the coil is arranged on the second leg between the first and third legs, wherein the coil assembly is positioned adjacent the wall such that main flux paths in the legs associated with the current through the coil are directed through at least one portion of the wall. 9. A system comprising: a wireless power transmitter device comprising a first enclosure, a first coil assembly in the first enclosure and comprising a first magnetic core and a first coil disposed on the first magnetic core, the first magnetic core positioned adjacent a wall of the first enclosure;a wireless power receiver device comprising a second enclosure, a second coil assembly in the second enclosure and comprising a second magnetic core and a second coil disposed on the second magnetic core, the second magnetic core positioned adjacent a wall of the second enclosure,wherein the wireless power transmitter device and the wireless power receiver device are disposed adjacent one another such that walls of the first and second enclosures are opposed and the first and second magnetic cores are aligned, and wherein respective first and second opposing portions of the walls of the first and second enclosures between the first and second magnetic cores have a magnetic permeability greater than air; anda magnetically permeable material deposited between the first and second portions of the first and second walls. 10. The system of claim 9, wherein the first and second portions of the first and second walls have a relative magnetic permeability greater than 1 and less than about 300. 11. The system of claim 9, wherein the first and second portions of the first and second walls comprise a plastic material having a magnetic material embedded therein. 12. The system of claim 9, at least one of the first and second portions of the first and second walls comprises a region with a first magnetic permeability embedded in another wall component having a second magnetic permeability. 13. The system of claim 12, wherein the region comprises a plastic magnetic material formed in a space defined in the wall component. 14. A system comprising: an equipment rack having at least one bus therein configured to provide power to at least one device installed in the equipment rack; anda wireless power receiver unit comprising an enclosure installed in the equipment rack, a converter circuit in the enclosure and having an output coupled to the at least one bus, and a coil assembly in the enclosure and comprising a magnetic core and a coil disposed on the magnetic core and coupled to an input of the converter circuit, the magnetic core positioned adjacent a wall of the enclosure such that a direction of a main flux path in the magnetic core is through at least one portion of the wall having a magnetic permeability greater than air, wherein the at least one portion of the wall comprises a plastic material having a magnetic material in the wall therein. 15. The system of claim 14, wherein the at least one portion of the wall has a relative magnetic permeability greater than 1 and less than about 300. 16. The system of claim 14, wherein the at least one portion of the wall comprises a region with a first magnetic permeability embedded in another wall component having a second magnetic permeability, and wherein the magnetic core is positioned adjacent the region such that the main flux path is directed through the region. 17. The system of claim 16, wherein the region comprises a plastic magnetic material formed in a space defined in the wall component. 18. The system of claim 14, further comprising a wireless power transmitter unit positioned adjacent the wall of the enclosure of the wireless power receiver unit and configured to wirelessly transfer power to the wireless power receiver unit. 19. The system of claim 18, wherein the enclosure comprises a first enclosure, wherein the wireless power transmitter unit comprises a second enclosure, and further comprising a magnetically permeable material region disposed between first and second walls of first and second enclosures. 20. A method comprising: providing an enclosure having a coil assembly therein, the coil assembly comprising a magnetic core and a coil disposed on the magnetic core, the magnetic core positioned adjacent a wall of the enclosure such that a direction of a main flux path in the magnetic core is through at least one portion of the wall; andcreating a material region in the at least one portion of the wall having a relative magnetic permeability greater than air by depositing a flowable magnetically permeable material in a recess in the wall. 21. The method of claim 20, wherein the flowable magnetically permeable material comprises a flowable plastic material having a magnetic material embedded therein. 22. The method of claim 21, wherein the embedded magnetic material comprises an iron powder.