# US 10,121,577 B2 · Integral inductor arrangement > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,121,577 B2 - Document ID: US10121577B2 - Status: Granted - Kind: B2 - Application number: 15/608,143 - Filed: 2017-05-30 - Published: 2017-09-14 - Granted: 2018-11-06 - Earliest claimed: 2012-05-18 - Assignees: SMA Solar Technology AG - Applicants: SMA Solar Technology AG - Inventors: Milosz Handzel; Stefan Domagala; Marek Rylko; Mariusz Walczak; Mariusz Gwadera; Artur Dziekan - Web page: https://patentgrep.com/patent/US10121577B2 ## CPC - H01F 3/14: Constrictions; Gaps, e.g. air-gaps (in magnetic shunt paths H01F3/12) - H01F 27/255: made from particles (H01F27/26 takes precedence) - H01F 27/263: {Fastening parts of the core together} - H01F 27/28: Coils; Windings; Conductive connections - H01F 27/303: {Clamping coils, windings or parts thereof together} - H01F 27/325: {Coil bobbins (formers for coils in general H01F5/02)} - H01F 37/00: Fixed inductances not covered by group H01F17/00 - H02M 1/126: {using passive filters} - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) ## Abstract The disclosure relates to an integral inductor arrangement with at least three magnetic loops arranged side by side to each other in a row and at least one winding associated with each of the magnetic loops. The magnetic loops are formed by individual core elements, each of which being part of one of the magnetic loops, and shared core elements, each of which being part of two adjacent of the magnetic loops. The shared core elements are separated from the individual core elements by magnetic gaps and each of the at least one winding is arranged around one of the individual core elements. The disclosure further relates to a use of such integral inductor arrangement within a 3-phase AC-filter for a power inverter for feeding electrical power into a power grid. ## Claims ### Claim 1 An integral inductor arrangement with at least three magnetic loops arranged side by side to each other in a row and at least one winding associated with each of the magnetic loops, the magnetic loops being formed by individual core elements, each of which being part of one of the magnetic loops, and shared core elements, each of which being part of two adjacent of the magnetic loops, wherein the shared core elements are separated from the individual core elements by magnetic gaps which are arranged each between a respective end surface of an individual core element and a respective side surface of an end section of a shared core element, and each of the at least one winding is arranged around one of the individual core elements and not arranged around the magnetic gaps, wherein each of the at least one winding defines a respective one of the magnetic loops, and further wherein the magnetic gaps comprise dielectrics, air gaps or magnetic materials having a lower permeability than the individual or shared core elements. ### Claim 2 (depends on 1) The integral inductor arrangement according to claim 1, wherein the shared core elements are arranged perpendicular to the individual core elements of at least one inner magnetic loop of the at least three magnetic loops arranged side by side to each other in a row. ### Claim 3 (depends on 1) The integral inductor arrangement according to claim 1, wherein the individual core elements and the shared core elements have the same cross-sectional area. ### Claim 4 (depends on 1) The integral inductor arrangement according to claim 1, wherein the windings associated with two adjacent of the magnetic loops have a different sense of winding. ### Claim 5 (depends on 1) The integral inductor arrangement according to claim 1, wherein individual core elements that carry a winding have an elliptical cross section. ### Claim 6 (depends on 1) The integral inductor arrangement according to claim 1, wherein the individual and/or shared core elements are made of stamped silicon steel sheets stacked to form a laminated structure. ### Claim 7 (depends on 1) The integral inductor arrangement according to claim 1, wherein the individual and/or shared core elements are made of ferrite. ### Claim 8 (depends on 1) The integral inductor arrangement according to claim 1, wherein the individual and/or shared core elements are made of laminated magnetic amorphous metal. ### Claim 9 (depends on 1) The integral inductor arrangement according to claim 1, wherein the individual and/or shared core elements are made of sintered powder of magnetic material. ### Claim 10 (depends on 1) The integral inductor arrangement according to claim 1, wherein individual core elements that carry a winding are made of sintered powder of magnetic material and all other individual core elements and the shared core elements are made of high magnetic permeability material. ### Claim 11 (depends on 1) The integral inductor arrangement according to claim 1, wherein the shared core elements are cuboidal blocks. ### Claim 12 (depends on 11) The integral inductor arrangement according to claim 11, wherein all cuboidal blocks are of equal size. ### Claim 13 (depends on 1) The integral inductor arrangement according to claim 1, wherein two of the magnetic loops are outer magnetic loops that are positioned around an inner magnetic loop, wherein the individual core elements of the outer magnetic loops are c-shaped. ### Claim 14 (depends on 13) The integral inductor arrangement according to claim 13, wherein the individual core element of each of the outer magnetic loops comprises three cuboidal blocks. ### Claim 15 (depends on 13) The integral inductor arrangement according to claim 13, wherein the individual core element of the inner magnetic loop comprises two cuboidal blocks. ### Claim 16 (depends on 1) The integral inductor arrangement according to claim 1, wherein the windings are wound on bobbins. ### Claim 17 (depends on 16) The integral inductor arrangement according to claim 16, wherein the bobbins have means for fixing the shared core elements. ### Claim 18 (depends on 1) The integral inductor arrangement according to claim 1, wherein the arrangement of core elements is secured by a compressing force. ### Claim 19 (depends on 18) The integral inductor arrangement according to claim 18, wherein the compressing force originates from bolts acting on two clamps, positioned on each head end of the arrangement.