# US 12,760,764 B2 · Magnetic bearing, compressor and air conditioner > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,760,764 B2 - Document ID: US12760764B2 - Status: Granted - Kind: B2 - Application number: 18/845,382 - Filed: 2022-12-22 - Published: 2025-06-12 - Granted: 2026-10-13 - Earliest claimed: 2022-05-26 - Assignees: Gree Electric Appliances, Inc. of Zhuhai - Applicants: Gree Electric Appliances, Inc. of Zhuhai - Inventors: Gao Gong; Fei Wang; Rui Wu - Web page: https://patentgrep.com/patent/US12760764B2 ## CPC - F16C 32/0485: {with active support of three degrees of freedom} - F16C 32/0465: {with permanent magnets provided in the magnetic circuit of the electromagnets} - F16C 2360/00: Engines or pumps - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS ## Abstract A magnetic bearing, a compressor and an air conditioner. The magnetic bearing comprises: an axial iron core, permanent magnets, a magnetic conductive ring and a magnetic steel fixing frame; the permanent magnets comprise a first permanent magnet located on one axial side of the magnetic conductive ring and a second permanent magnet located on the other axial side of the magnetic conductive ring; the first permanent magnet is located between the magnetic conductive ring and the axial iron core and is connected to the magnetic conductive ring and the axial iron core; the second permanent magnet is located between the magnetic conductive ring and the axial iron core and is connected to the magnetic conductive ring and the axial iron core. The magnetic steel fixing frame can fix and support the radial inner sides of the permanent magnets. ## Claims ### Claim 1 A magnetic bearing, comprising: an axial iron core, a permanent magnet, a magnetic conductive ring and a magnetic steel fixing frame, wherein the permanent magnet comprises a first permanent magnet located on a side of the magnetic conductive ring and a second permanent magnet located on another side of the magnetic conductive ring in an axial direction of the magnetic conductive ring, the first permanent magnet is located between the magnetic conductive ring and the axial iron core and is connected to the magnetic conductive ring and the axial iron core, and the second permanent magnet is located between the magnetic conductive ring and the axial iron core and is connected to the magnetic conductive ring and the axial iron core, wherein the magnetic steel fixing frame is capable of fixing and supporting a radial inner side of the permanent magnet, and wherein the magnetic steel fixing frame comprises an annular body and a protruding portion, the protruding portion is arranged on a radial periphery of the annular body and protrudes outward in a radial direction of the annular body. ### Claim 2 (depends on 1) The magnetic bearing of claim 1, wherein: the magnetic steel fixing frame comprises a first magnetic steel fixing frame and a second magnetic steel fixing frame, the first magnetic steel fixing frame is capable of cooperating with the first permanent magnet to fix and support a radial inner side of the first permanent magnet, and the second magnetic steel fixing frame is capable of cooperating with the second permanent magnet to fix and support a radial inner side of the second permanent magnet. ### Claim 3 (depends on 1) The magnetic bearing of claim 1, wherein: the protruding portion is provided with a fixing frame mounting hole which penetrates through both axial ends of the protruding portion in an axial direction of the annular body, and the protruding portion is capable of being fixed to the magnetic conductive ring by the fixing frame mounting hole. ### Claim 4 (depends on 1) The magnetic bearing of claim 1, further comprising: a bearing rotor and a radial iron core, wherein the axial iron core is in a concave shape in a radial cross section, the radial iron core, the permanent magnet, and the magnetic conductive ring are all located in a space surrounded by the axial iron core. ### Claim 5 (depends on 4) The magnetic bearing of claim 4, further comprising: a radial control winding and an axial control winding, wherein the radial control winding is wound on the radial iron core, and the axial control winding is located on a radial outer side of the magnetic conductive ring. ### Claim 6 (depends on 5) The magnetic bearing of claim 5, further comprising: an axial winding skeleton, wherein the axial winding skeleton is arranged on a radial periphery of the magnetic conductive ring, the axial winding skeleton has an annular structure, a radial outer periphery of the axial winding skeleton is provided with an annular groove that is provided with an opening outward in a radial direction of the axial winding skeleton, and the axial control winding is arranged in the annular groove. ### Claim 7 (depends on 6) The magnetic bearing of claim 6, further comprising: an axial skeleton support ring, wherein: the axial skeleton support ring is arranged on a radial periphery of the magnetic conductive ring, the axial winding skeleton comprises a first axial winding skeleton and a second axial winding skeleton, the first axial winding skeleton is connected to an axial end of the axial skeleton support ring, and the second axial winding skeleton is connected to another axial end of the axial skeleton support ring, to support the first axial winding skeleton and the second axial winding skeleton by the axial skeleton support ring. ### Claim 8 (depends on 7) The magnetic bearing of claim 7, wherein: the axial skeleton support ring is provided with an axial skeleton mounting hole which penetrates through both axial end faces of the axial skeleton support ring, the first axial winding skeleton is provided with a first protruding portion, the second axial winding skeleton is provided with a second protruding portion, the first protruding portion faces the axial skeleton mounting hole and is capable of being inserted into the axial skeleton mounting hole, and the second protruding portion faces the axial skeleton mounting hole and is capable of being inserted into the axial skeleton mounting hole. ### Claim 9 (depends on 8) The magnetic bearing of claim 8, wherein: a countersunk hole is provided at a top of the first protruding portion in a direction away from the second protruding portion, and the second protruding portion is capable of being inserted into the countersunk hole after being inserted into and passing through the axial skeleton mounting hole. ### Claim 10 (depends on 7) The magnetic bearing of claim 7, wherein: an annular protruding portion is provided on an outer peripheral surface of the magnetic conductive ring, a first step is formed at an axial end of the annular protruding portion, a second step is formed at another axial end of the annular protruding portion, a radial inner periphery of the axial skeleton support ring further protrudes inward in a radial direction of the axial skeleton support ring to form a third step, and the third step is engageable with the second step. ### Claim 11 (depends on 10) The magnetic bearing of claim 10, wherein the first axial winding skeleton is capable of abutting against an axial end of the axial skeleton support ring and/or against the first step, and the second axial winding skeleton is capable of abutting against another axial end of the axial skeleton support ring. ### Claim 12 (depends on 7) The magnetic bearing of claim 7, wherein the axial control winding is wound on each of the first axial winding skeleton and the second axial winding skeleton. ### Claim 13 (depends on 7) The magnetic bearing of claim 7, wherein the axial skeleton support ring is made of a non-magnetic material. ### Claim 14 (depends on 4) The magnetic bearing of claim 4, wherein: the axial iron core comprises a first axial iron core and a second axial iron core, and the first axial iron core and the second axial iron core are distributed and butted along an axial direction of the bearing rotor. ### Claim 15 (depends on 14) The magnetic bearing of claim 14, wherein an interior of the first axial iron core has a first cavity, an interior of the second axial iron core has a second cavity, the first cavity and the second cavity are butted to form an accommodating cavity after the first axial iron core and the second axial iron core are butted, and the permanent magnet, the magnetic conductive ring, the magnetic steel fixing frame, the bearing rotor and the radial iron core are all located in the accommodating cavity. ### Claim 16 (depends on 4) The magnetic bearing of claim 4, wherein the bearing rotor is located at an indentation on a radial inner side of the axial iron core, the radial iron core is located on a radial outer side of the bearing rotor, and the magnetic conductive ring is located on a radial outer side of the radial iron core. ### Claim 17 (depends on 1) A compressor, comprising the magnetic bearing of claim 1. ### Claim 18 (depends on 17) An air conditioner, comprising the compressor of claim 17. ### Claim 19 (depends on 1) The magnetic bearing of claim 1, wherein the magnetic bearing comprises a plurality of protruding portions, the plurality of protruding portions are arranged at intervals along a circumferential direction of the annular body, an accommodating space is formed between two adjacent protruding portions, the magnetic bearing comprises a plurality of permanent magnets arranged at intervals along the circumferential direction, and each permanent magnet is arranged in a one-to-one correspondence with the accommodating space. ### Claim 20 A magnetic bearing, comprising: an axial iron core, a permanent magnet, a magnetic conductive ring and a magnetic steel fixing frame, wherein the permanent magnet comprises a first permanent magnet located on a side of the magnetic conductive ring and a second permanent magnet located on another side of the magnetic conductive ring in an axial direction of the magnetic conductive ring, the first permanent magnet is located between the magnetic conductive ring and the axial iron core and is connected to the magnetic conductive ring and the axial iron core, and the second permanent magnet is located between the magnetic conductive ring and the axial iron core and is connected to the magnetic conductive ring and the axial iron core, wherein the magnetic steel fixing frame is capable of fixing and supporting a radial inner side of the permanent magnet, wherein the magnetic bearing further comprises: a bearing rotor and a radial iron core, wherein the axial iron core is in a concave shape in a radial cross section, and wherein the radial iron core, the permanent magnet, and the magnetic conductive ring are all located in a space surrounded by the axial iron core; and a radial control winding and an axial control winding, wherein the radial control winding is wound on the radial iron core, and wherein the axial control winding is located on a radial outer side of the magnetic conductive ring.