# US 11,443,884 B2 · Magnetic inductor, electromagnetic pump comprising such a magnetic inductor and method for manufacturing a magnetic inductor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,443,884 B2 - Document ID: US11443884B2 - Status: Granted - Kind: B2 - Application number: 16/763,871 - Filed: 2018-11-19 - Published: 2021-06-10 - Granted: 2022-09-13 - Earliest claimed: 2017-11-20 - Assignees: Commissariat A L'energie Atomique Et Aux Energies Alternatives - Applicants: Commissariat à L'éNergie Atomique Et Aux éNergies Alternatives - Inventors: Sylvain Vitry - Web page: https://patentgrep.com/patent/US11443884B2 ## CPC - H01F 27/28: Coils; Windings; Conductive connections - H02K 44/06: Induction pumps - H01F 41/04: for manufacturing coils {(coils for transformer or inductances H01F27/28)} - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract A magnetic inductor for an electromagnetic pump, the magnetic inductor being intended for being supplied with a polyphase current containing at least two phases, the magnetic inductor comprising a magnetic inductor body and for each of the phases of the polyphase current, N pairs of elementary coils with the same winding direction following one another. The connection between the elementary coils associated with the phase is as follows: for each from the first to the N-th pair, each of the first and second elementary coils has one of the ends thereof connected to the end of the same type as the elementary coil of the same type that directly follows same. ## Claims ### Claim 1 A magnetic inductor for an electromagnetic pump, the magnetic inductor being intended to be power supplied by means of a polyphase current comprising at least two phases, the magnetic inductor comprising: a magnetic inductor body extending longitudinally, for each of the phases of the polyphase current, N pairs of elementary coils of the same winding direction following each other from the first pair to Nth pair along the magnetic body (101), N being an integer greater than or equal to 2, each of the pairs comprising a first and a second elementary coil which follow one another along the magnetic inductor body, each elementary coil including two ends, one of which is an input type end and the other of which is an output type end, wherein the pairs of elementary coils are distributed along the magnetic inductor body so as to provide a phase alternation and to provide a magnetic field sliding along the magnetic inductor body, wherein for each of the phases a connection between the elementary coils associated with said phase is as follows: the first and the second elementary coil of the first pair are intended to be respectively connected to one of a current input and a current output of said phase and to the other of the current input and the current output of said phase; for each of the first to the N−1st pair, the first elementary coil has one of the ends (I, O) thereof connected to the end of the same type of the first elementary coil which directly follows it along the magnetic inductor body; for each of the second to Nth pair, the second elementary coil has one of the ends (I, O) thereof connected to the end of the same type of the second elementary coil which directly precedes it along the magnetic inductor body; and for the Nth pair, the first and second elementary coils are connected in series. ### Claim 2 (depends on 1) The magnetic inductor according to claim 1, wherein the magnetic inductor body includes a delimiting surface intended to be facing a channel of the electromagnetic pump, and wherein the magnetic inductor body includes on its delimiting surface a plurality of transverse grooves which follow one another along the magnetic inductor body and wherein the elementary coils are housed. ### Claim 3 (depends on 2) The magnetic inductor according to claim 2 wherein each of the elementary coils connected to another elementary coil is connected by means of a respective electrical conductor which extends along the delimiting surface. ### Claim 4 (depends on 3) The magnetic inductor according to claim 3, wherein the magnetic inductor body further includes on its surface longitudinal grooves wherein are housed electrical conductors by which at least part of the coils are connected together. ### Claim 5 (depends on 1) The magnetic inductor according to claim 1 wherein the magnetic inductor body includes a plurality of magnetic plates extending along a main axis and having a cross section in the shape of an involute of a circle, the magnetic plates being interlocked with their circle of the involute of a circle merged together in the shape of a tube extending longitudinally along the main axis, said tube forming the magnetic inductor body. ### Claim 6 (depends on 1) The magnetic inductor according to claim 1, wherein the magnetic inductor is an internal magnetic inductor intended to delimit with a protection tube an internal wall of a channel of the electromagnetic pump (1). ### Claim 7 (depends on 1) The magnetic inductor according to claim 1, wherein the magnetic inductor is an external magnetic inductor intended to delimit with a protection tube an external wall of a channel of the electromagnetic pump. ### Claim 8 (depends on 6) An electromagnetic pump including a first magnetic inductor according to claim 6. ### Claim 9 (depends on 7) The electromagnetic pump including a first magnetic inductor according to claim 7. ### Claim 10 (depends on 8) The electromagnetic pump according to claim 8 further comprising a second magnetic inductor. ### Claim 11 A method for manufacturing a magnetic inductor for an electromagnetic pump, the magnetic inductor being intended to be power supplied by means of a polyphase current comprising several phases, the method being characterised in that it comprises: providing a magnetic inductor body, providing and connecting, for each of the phases of the polyphase current, N pairs of elementary coils of the same winding direction following one another of the first pair to the Nth pair along the magnetic inductor body (101), N being an integer greater than or equal to 2, each of the pairs comprising a first and a second elementary coil which follow one another along the magnetic inductor body each elementary coil including two ends one of which is an input type end and the other of which is an output type end, with, for each of the phases: the first and the second elementary coil of the first pair are intended to be respectively connected to one of a current input and a current output of said phase and to the other of the current input and the current output of said phase; for each of the first to the N−1st pair the first elementary coil has one of the ends (I, O) thereof connected to the end of the same type of the first elementary coil which directly follows it along the magnetic inductor body; for each of the second to Nth pair, the second elementary coil has one of the ends (I, O) thereof connected to the end of the same type of the second elementary coil which directly precedes it along the magnetic inductor body (101); and for the Nth pair, the first and second elementary coils are connected in series. ### Claim 12 (depends on 11) The method for manufacturing an inductor according to claim 11, wherein the magnetic inductor body includes a plurality of magnetic plates extending along a main axis and having a cross section in the shape of an involute of a circle, providing the magnetic inductor body includes: providing the plurality of identical magnetic plates, each of the magnetic plates extending along a main axis and having a cross section in the shape of an involute of a circle, assembling the plurality of magnetic plates by interlocking in order to form the magnetic inductor body, the circle of the involutes of a circle of the magnetic plates being merged together. ### Claim 13 (depends on 12) The method for manufacturing an inductor according to claim 12, wherein the step of providing the magnetic inductor body further includes: cutting the transverse grooves in a longitudinal surface of the tubular body of an internal longitudinal surface and an external longitudinal surface in order to form a housing for the elementary coils, and wherein the provision and connection provision and connection step includes the following sub-steps: providing elementary coils, placing the elementary coils in the transverse grooves formed during the cutting step.