# US 2018/0025839 A1 · Power Transfer Unit of a System for Inductive Power Transfer, a Method of Manufacturing a Primary Power Transfer Unit and of Operating a Primary Power Transfer Unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0025839 A1 - Document ID: US20180025839A1 - Status: Published application - Kind: A1 - Application number: 15/550,967 - Filed: 2016-02-15 - Published: 2018-01-25 - Earliest claimed: 2015-02-16 - Assignees: Bombardier Primove GmbH - Applicants: Bombardier Primove GmbH - Inventors: Konrad Woronowicz; Robert Czainski - Web page: https://patentgrep.com/patent/US20180025839A1 ## CPC - H01F 38/14: Inductive couplings - B60L 53/122: Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil - H01F 27/363: {made of electrically conductive material} - H01F 41/04: for manufacturing coils {(coils for transformer or inductances H01F27/28)} - H02J 50/10: using inductive coupling - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors - Y02T 90/14: Plug-in electric vehicles - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A power transfer unit of a system for inductive power transfer, wherein the power transfer unit includes a winding structure, and at least one flux guiding means for guiding a magnetic flux of the electromagnetic field, wherein the at least one flux guiding means provides at least one low reluctance section with a first reluctance and at least one high reluctance section with a second reluctance, and the second reluctance is higher than the first reluctance. Also, a method of manufacturing a power transfer unit and a method of operating a power transfer unit. ## Claims ### Claim 1 A power transfer unit of a system for inductive power transfer, wherein the power transfer unit comprises a winding structure, wherein the power transfer unit further comprises at least one flux guiding means for guiding a magnetic flux of an electromagnetic field, wherein the at least one flux guiding means comprises or provides at least one low reluctance section with a first reluctance and at least one high reluctance section with a second reluctance, wherein the second reluctance is higher than the first reluctance, wherein the at least one high reluctance section extends parallel to a lateral axis of the winding structure, and wherein a geometric centre or centreline of the at least one high reluctance section is arranged within a centre plane between two adjacent poles provided by the winding structure. ### Claim 2 (depends on 1) The power transfer unit according to claim 1, wherein the at least one flux guiding means is designed as a flux guiding layer. ### Claim 3 (depends on 1) The power transfer unit according to claim 1, wherein the flux guiding layer comprises one or more ferrite bars or ferrite plates, wherein the ferrite bars or ferrite plates extend parallel to a longitudinal axis of the winding structure. ### Claim 4 (depends on 1) The power transfer unit according to claim 1, wherein the at least one high reluctance section is provided at least partially by a diminution of a cross-sectional area of the at least one flux guiding means. ### Claim 5 (depends on 1) The power transfer unit according to claim 1, wherein the at least one high reluctance section is provided by a gap (6) between two low reluctance sections. ### Claim 6 (depends on 1) The power transfer unit according to claim 1, wherein the power transfer unit comprises at least one flux control means for controlling the flux in the flux guiding means. ### Claim 7 (depends on 1) The power transfer unit according to claim 1, wherein the at least one high reluctance section is arranged symmetrical with respect to the winding structure. ### Claim 8 (depends on 1) The power transfer unit according to claim 1, wherein the power transfer winding structure comprises a first sub-winding and at least one second sub-winding, wherein a winding section of the first sub-winding and a winding section of the at least one second sub-winding extend parallel to each other and are arranged adjacent to each other within a common winding section, and wherein the at least one high reluctance section is arranged under the common winding section. ### Claim 9 (depends on 1) The power transfer unit according to claim 1, wherein a maximal length of the at least one high reluctance section along a longitudinal axis of the winding structure is higher than 0.0 mm and smaller than or equal to 30.0 mm. ### Claim 10 A method of manufacturing a power transfer unit comprising the steps of providing a winding structure, providing at least one flux guiding means for guiding a magnetic flux of the electromagnetic field such that the at least one flux guiding means comprises or provides at least one low reluctance section with a first reluctance and at least one high reluctance section with second reluctance, wherein the second reluctance is higher than the first reluctance, wherein the at least one high reluctance section extends parallel to a lateral axis of the winding structure, wherein a geometric centre or centreline of the at least one high reluctance section is arranged within a centre plane between two adjacent poles provided by the winding structure. ### Claim 11 (depends on 10) The method according to claim 10, wherein the at least one high reluctance section is designed and or arranged such that a first predetermined field density at a predetermined reference point in a reference volume above or below the winding structure is provided, wherein the flux density at a predetermined reference point outside the reference volume is smaller than another predetermined flux density. ### Claim 12 (depends on 1) A method of operating a power transfer unit according to claim 1, wherein the power transfer unit is energized. ### Claim 13 (depends on 12) The method of claim 12, wherein at least one flux control means of the power transfer unit is controlled such that a desired reluctance is provided in at least one section of the flux guiding means.