# US 2013/0154629 A1 · Toroidal fluxgate current transducer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0154629 A1 - Document ID: US20130154629A1 - Status: Published application - Kind: A1 - Application number: 13/818,259 - Filed: 2011-08-19 - Published: 2013-06-20 - Earliest claimed: 2010-08-24 - Assignees: Lem Intellectual Property SA - Inventors: Claude Gudel; Benjamin Marcoz; Bernard Richard; Gérard Gery - Web page: https://patentgrep.com/patent/US20130154629A1 ## CPC - G01R 33/0017: {Means for compensating offset magnetic fields or the magnetic flux to be measured; Means for generating calibration magnetic fields} - G01R 15/185: {with compensation or feedback windings or interacting coils, e.g. 0-flux sensors (using galvano-magnetic field sensors G01R15/20; conversion of DC into AC using transductors G01R19/20)} - G01R 33/04: using the flux-gate principle - H01F 27/2895: {Windings disposed upon ring cores} - H01F 38/30: Constructions - G01R 1/04: Housings; Supporting members; Arrangements of terminals - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract Toroidal fluxgate current transducer comprising a ring shaped fluxgate sensing unit (6) comprising a ring-shaped support (40), a saturable magnetic core (38) mounted on the support (40), an excitation coil (44) wound around the support and saturable core and a magnetic shell (32) mounted around the excitation coil, ring-shaped support and saturable core. The support is ringed-shape and comprises terminals (50,48) fixed to the support, a first pair of said terminals connected to ends of the excitation coil, and a second pair of said terminals connected to ends of a secondary coil of the current transducer. ## Claims ### Claim at position 1 1-15. (canceled) ### Claim 16 Toroidal fluxgate current transducer comprising a ring shaped fluxgate sensing unit comprising a secondary coil made of a conducting wire, a ring-shaped dielectric support, a saturable magnetic core mounted on the support, an excitation coil made of a conducting wire wound around the support and saturable core, and a magnetic shell mounted around the excitation coil, ring-shaped support and saturable core, wherein the support comprises terminals fixed to the support, a first pair of said terminals connected to ends of the excitation coil, and a second pair of said terminals connected to ends of the secondary coil of the current transducer. ### Claim 17 (depends on 16) Transducer according to claim 16, further comprising a circuit board connected to said terminals of the sensing unit. ### Claim 18 (depends on 16) Transducer according to claim 16, wherein the sensing unit further comprises dielectric housing shells mounted around the excitation coil and saturable core and forming a support around which the secondary coil is wound. ### Claim 19 (depends on 18) Transducer according to claim 18, wherein the dielectric housing shells comprise a plurality of spaced apart radial fins. ### Claim 20 (depends on 18) Transducer according to claim 18, wherein the dielectric shell comprises protuberances engaging in complementary orifices in a circuit board of the transducer. ### Claim 21 (depends on 16) Transducer according to claim 16, wherein the ring-shaped dielectric support of the sensing unit comprises a plurality of spaced apart radial fins providing positioning surfaces configured to position the support with respect to magnetic shells mounted around the dielectric support and excitation conductor. ### Claim 22 (depends on 16) Transducer according to claim 16, further comprising a primary conductor unit provided as a separate component, comprising a dielectric body and one or more conductors configured for carrying a current to be measured held together within the dielectric body forming a general U or V-shaped component separably mountable through the central passage of the housing and lockable to the housing by complementary locking members provided on the dielectric body and housing. ### Claim 23 (depends on 16) Transducer according to claim 16, further comprising an inner magnetic shield and/or an outer magnetic shield. ### Claim 24 (depends on 23) Transducer according to claim 23, wherein the magnetic shields are made of a strip or band of material with a high magnetic permeability folded in a ring shape. ### Claim 25 Toroidal current transducer comprising a housing, a ring shaped magnetic field sensing unit mounted in the housing, and a central passage, wherein the transducer comprises a primary conductor unit provided as a separate component, comprising a dielectric body and one or more conductors configured for carrying a current to be measured held together within the dielectric body forming a general U or V-shaped component separably mountable through the central passage of the housing and lockable to the housing by complementary locking members provided on the dielectric body and housing. ### Claim 26 (depends on 25) Transducer according to claim 25, wherein the dielectric body is a plastic body moulded over the primary conductors. ### Claim 27 (depends on 25) Transducer according to claim 25, wherein connection ends of the primary conductors at both ends of the primary conductor unit are parallel and project beyond a mounting face of the transducer. ### Claim 28 (depends on 25) Transducer according to claim 25, wherein the dielectric body comprises integrally moulded elastic clip arms that interengage with complementary clips in the transducer housing to fix and lock the primary conducting unit to the transducer housing. ### Claim 29 (depends on 25) Transducer according to claim 25, wherein the dielectric body comprises positioning shoulders or flanges that abut against the transducer housing to position the primary conductor unit with respect to the housing. ### Claim 30 (depends on 25) Transducer according to claim 25, wherein the primary conductor unit comprises at least four primary conductors forming at least first and second conductors pairs, a first pair for carrying current in one direction and a second pair for carrying current in the opposite direction, the conductor pairs arranged such that the conductors of one pair are positioned between and interleaving the conductors of the other pair. ### Claim 31 (depends on 25) Transducer according to claim 25, wherein the ring shaped fluxgate sensing unit comprises a secondary coil made of a conducting wire, a ring-shaped dielectric support, a saturable magnetic core mounted on the support, an excitation coil made of a conducting wire wound around the support and saturable core, and a magnetic shell mounted around the excitation coil, ring-shaped support and saturable core, the support comprising terminals fixed to the support, a first pair of said terminals connected to ends of the excitation coil, and a second pair of said terminals connected to ends of the secondary coil of the current transducer. ### Claim 32 (depends on 25) Transducer according to claim 25, further comprising an inner magnetic shield and/or an outer magnetic shield. ### Claim 33 (depends on 32) Transducer according to claim 32, wherein the magnetic shields are made of a strip or band of material with a high magnetic permeability folded in a ring shape. ### Claim 34 (depends on 25) Transducer according to claim 25, further comprising a circuit board connected to said terminals of the sensing unit. ### Claim 35 (depends on 25) Transducer according to claim 25, wherein the sensing unit further comprises dielectric housing shells mounted around the excitation coil and saturable core and forming a support around which the secondary coil is wound. ### Claim 36 (depends on 25) Transducer according to claim 25, wherein the dielectric housing shells comprise a plurality of spaced apart radial fins. ### Claim 37 (depends on 36) Transducer according to claim 36, wherein the dielectric shell comprises protuberances engaging in complementary orifices in a circuit board of the transducer. ### Claim 38 (depends on 25) Transducer according to claim 25, wherein the ring-shaped dielectric support of the sensing unit comprises a plurality of spaced apart radial fins providing positioning surfaces configured to position the support with respect to magnetic shells mounted around the dielectric support and excitation conductor.