# US 12,191,073 B2 · Magnet device based on the bitter principle and use of a magnet device based on the bitter principle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,073 B2 - Document ID: US12191073B2 - Status: Granted - Kind: B2 - Application number: 18/245,899 - Filed: 2021-08-18 - Published: 2023-11-23 - Granted: 2025-01-07 - Earliest claimed: 2020-09-24 - Assignees: Karlsruher Institut Fuer Technologie - Applicants: Karlsruher Institut Fuer Technologie - Inventors: Tabea Arndt - Web page: https://patentgrep.com/patent/US12191073B2 ## CPC - H01F 1/16: in the form of sheets (H01F1/147 takes precedence) - H01F 6/06: Coils, e.g. winding, insulating, terminating or casing arrangements therefor - H01F 7/20: without armatures (cores H01F3/00; coils H01F5/00 {; shaping metal by applying magnetic forces B21D26/14; electromagnets specially adapted for NMR applications G01R33/381}) - H02K 1/02: characterised by the magnetic material - 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 magnet device based on the Bitter principle includes a plurality of conductor layers and a plurality of substrate layers. Each respective substrate layer carries a corresponding conductor layer, and each respective substrate layer and corresponding conductor layer together form a respective ring having a radial slot. The plurality of conductor layers and the plurality of substrate layers together form three or more rings in a spiral arrangement with an initial ring, an end ring, and one or more middle rings. The initial ring and the end ring are, via a contact section, in current-conducting contact with at least one respective middle ring. Each middle ring is, via a contact section, in current-conducting contact with two other rings. The three or more rings are arranged such that a ring with a downward-facing conductor layer follows a ring with an upward-facing conductor layer. ## Claims ### Claim 1 A magnet device based on the Bitter principle, the magnet device comprising: a plurality of conductor layers, and a plurality of substrate layers, wherein each respective substrate layer carries a respective corresponding conductor layer, wherein each respective substrate layer and corresponding respective conductor layer together form a respective ring having a radial slot extending through the entire respective ring, wherein the plurality of conductor layers and the plurality of substrate layers together form three or more rings in a spiral arrangement with an initial ring, an end ring, and one or more middle rings, wherein the initial ring and the end ring, each having an end adjacent to a respective slot are, via a contact section, in current-conducting contact with at least one respective middle ring of the one or more middle rings at an end of the respective middle ring adjacent to the respective slot, wherein each middle ring has two ends adjacent to a respective slot and is, via a contact section, in current-conducting contact with two other rings, and wherein the three or more rings are arranged alternately such that a ring with a downward-facing conductor layer follows a ring with an upward-facing conductor layer. ### Claim 2 (depends on 1) The magnet device according to claim 1, wherein the two respective contacting rings overlap each other at a respective contact section, and/or a contact material is applied to a respective contact section in a planar manner, or the conductor layers that face each other of the two respective contacting rings are sintered together at the contact section. ### Claim 3 (depends on 2) The magnet device according to claim 2, wherein the contact material is a material that is superconducting during operation of the magnet device, and wherein the contact material is a layer comprising indium, tin, lead, or niobium. ### Claim 4 (depends on 1) The magnet device according to claim 1, wherein the three or more rings have through-holes in their annular surfaces, and the rings in the spiral arrangement are arranged one above the other such that that the through-holes of the rings are aligned with one another to form cooling channels. ### Claim 5 (depends on 1) The magnet device according to claim 1, wherein in the spiral arrangement, respective spaces are provided between the three or more rings except at contact sections, wherein a filler material for stabilizing the spiral arrangement is arranged in the respective spaces. ### Claim 6 (depends on 5) The magnet device according to claim 5, wherein the cooling channels extend through the filler material. ### Claim 7 (depends on 1) The magnet device according to claim 1, wherein the plurality of conductor layers are superconductor layers. ### Claim 8 (depends on 1) The magnet device according to claim 1, wherein the plurality of substrate layers comprise stainless steel, nickel, nickel alloys, or nickel-molybdenum alloys. ### Claim 9 (depends on 1) The magnet device according to claim 1, wherein the initial ring and the end ring are connected to an electrical contact device at respective ends that are not in current-conducting contact with a middle ring, and/or the electrical contact device is a persistent-mode bridge. ### Claim 10 (depends on 1) A coil in a rotor-stator arrangement of an electric machine, wherein the coil comprising the magnet device according to claim 1. ### Claim 11 (depends on 5) The magnet device according to claim 5, wherein the filler material is an insulating and/or thermally conductive material. ### Claim 12 (depends on 7) The magnet device according to claim 7, wherein the superconductor layers are high-temperature superconductor layers, which have a 2G high-temperature superconductor, preferably RE-123, wherein a crystallographic C-axis of the high-temperature superconductor layer is oriented parallel to a longitudinal axis of the spiral arrangement.