# US 11,909,296 B2 · Magnetic bearing and compressor having the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,296 B2 - Document ID: US11909296B2 - Status: Granted - Kind: B2 - Application number: 17/223,699 - Filed: 2021-04-06 - Published: 2021-10-14 - Granted: 2024-02-20 - Earliest claimed: 2020-04-09 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Sena Jeong; Kiwook Lee; Seongki Baek - Web page: https://patentgrep.com/patent/US11909296B2 ## CPC - H02K 7/09: with magnetic bearings - F04D 17/10: for compressing or evacuating - F04D 29/051: Axial thrust balancing - F04D 29/058: magnetic; electromagnetic - F16C 32/0461: {of stationary parts of the magnetic circuit} - F16C 32/047: {Details of housings; Mounting of active magnetic bearings} - F16C 32/048: {with active support of two degrees of freedom, e.g. radial magnetic bearings} - F25B 1/04: with compressor of rotary type ({F25B1/005,} F25B1/10 take precedence) - F25B 49/025: {Motor control arrangements} - H02K 3/522: {for generally annular cores with salient poles} - H02K 5/22: Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes - H02K 7/14: Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) - F05D 2270/334: Vibration measurements - F16C 32/0444: {Details of devices to control the actuation of the electromagnets} - F16C 32/0489: {with active support of five degrees of freedom, e.g. two radial magnetic bearings combined with an axial bearing} - F16C 2362/52: Compressors of refrigerators, e.g. air-conditioners - F25B 2339/047: Water-cooled condensers - F25B 2500/13: Vibrations - H02K 2203/12: Machines characterised by the bobbins for supporting the windings - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract A magnetic bearing is provided. The magnetic according to the present disclosure includes: a stator core disposed to surround a central axis; a plurality of bobbins coupled to the stator core; a coil wound around the bobbin; and a positioning member coupled to the plurality of bobbins and determining positions of the plurality of bobbins, and the positioning member has a circular shape centered on a central point. ## Claims ### Claim 1 A magnetic bearing comprising: a stator core disposed to surround a central axis; a plurality of bobbins coupled to the stator core; a coil wound around each of the plurality of bobbins; and a positioning member coupled to the plurality of bobbins via a plurality of fasteners and determining positions of the plurality of bobbins, wherein the positioning member has a circular shape centered on a central point, wherein the positioning member comprises a plurality of coupling holes extending through an entire thickness of the positioning member, and wherein the plurality of fasteners extend through the plurality of coupling holes and are inserted by passing from an outer surface of the positioning member into the plurality of coupling holes. ### Claim 2 (depends on 1) The magnetic bearing of claim 1, wherein the central point of the positioning member is positioned on the central axis of the stator core. ### Claim 3 (depends on 1) The magnetic bearing of claim 1, further comprising a plurality of fastening members passing through the plurality of coupling holes to couple the positioning member to the plurality of bobbins. ### Claim 4 (depends on 3) The magnetic bearing of claim 3, wherein two of the plurality of coupling holes form a set, and a pitch between adjacent sets is constant. ### Claim 5 (depends on 1) The magnetic bearing of claim 1, wherein separation distances of the plurality of bobbins from the central axis are equal to each other. ### Claim 6 (depends on 1) The magnetic bearing of claim 1, wherein separation distances between the plurality of bobbins adjacent to each other are constant. ### Claim 7 (depends on 1) The magnetic bearing of claim 1, further comprising a plurality of teeth protruding toward a center of the stator core from an inner circumferential surface of the stator core, wherein the plurality of bobbins comprise: a plurality of first bobbins coupled to a front end of each of the teeth; and a plurality of second bobbins coupled to a rear end of each tooth. ### Claim 8 (depends on 7) The magnetic bearing of claim 7, wherein the positioning member comprises: a first positioning member coupled to the plurality of first bobbins; and a second positioning member coupled to the plurality of second bobbins. ### Claim 9 (depends on 8) The magnetic bearing of claim 8, wherein the first positioning member is positioned in front of the stator core, and wherein the second positioning member is positioned behind the stator core. ### Claim 10 A magnetic bearing comprising: a stator core disposed to surround a central axis; a plurality of bobbins coupled to the stator core; a coil wound around each of the plurality of bobbins; and a positioning member coupled to the plurality of bobbins and determining positions of the plurality of bobbins, wherein the positioning member has a circular shape centered on a central point, and wherein each of the plurality of bobbins comprise: a coil coupling part on which the coil is wound; and a holder comprising a coupling groove into which the positioning member is inserted and a fastening groove formed in the coupling groove and to which a fastening member is fastened. ### Claim 11 (depends on 10) The magnetic bearing of claim 10, wherein each coupling groove forms an arc having a radius equal to a radius of the positioning member. ### Claim 12 (depends on 10) The magnetic bearing of claim 10, wherein each coil coupling part comprises: a body on which the coil is wound; a first flange connected to one end of the body in a thickness direction and having a width greater than a width of the body; and a second flange connected to the other end of the body in the thickness direction and having a width greater than the width of the body. ### Claim 13 (depends on 12) The magnetic bearing of claim 12, wherein for each of the plurality of bobbins, the holder is connected to the second flange. ### Claim 14 (depends on 12) The magnetic bearing of claim 12, wherein for each of the plurality of bobbins, the holder is positioned farther from the central axis than the coil coupling part. ### Claim 15 (depends on 12) The magnetic bearing of claim 12, wherein an extension line of the body in the thickness direction meets the central point. ### Claim 16 A magnetic bearing comprising: a stator core disposed to surround a central axis; a plurality of bobbins coupled to the stator core; a coil wound around the bobbin; and a positioning member coupled to the plurality of bobbins and determining positions of the plurality of bobbins, wherein each of the plurality of bobbins comprise a coupling groove into which the positioning member is inserted, and wherein the coupling grooves have an arc-shape. ### Claim 17 A compressor comprising: one or more impellers for suctioning and compressing a refrigerant; a motor rotating the impeller; a rotation shaft to which the impeller and the motor are connected; and a magnetic bearing supporting the rotation shaft in a radial direction crossing an axial direction of the rotation shaft, wherein the magnetic bearing comprises: a stator core disposed to surround a central axis; a plurality of bobbins coupled to the stator core; a coil wound around the bobbin; and a positioning member coupled to the plurality of bobbins via a plurality of fasteners and determining positions of the plurality of bobbins, wherein the positioning member comprises a plurality of coupling holes extending through an entire thickness of the positioning member, wherein the positioning member has a circular shape centered on a central point, and wherein the plurality of fasteners extend through the plurality of coupling holes and are inserted by passing from an outer surface of the positioning member into the plurality of coupling holes. ### Claim 18 (depends on 17) The compressor of claim 17, wherein the central point of the positioning member is positioned on a central axis of the stator core. ### Claim 19 (depends on 17) The compressor of claim 17, wherein each of the plurality of bobbins comprise: a coil coupling part on which the coil is wound; and a holder comprising a coupling groove into which the positioning member is inserted and a fastening groove formed in the coupling groove and to which a fastening member is fastened. ### Claim 20 (depends on 19) The compressor of claim 19, wherein each coupling groove forms an arc having a radius equal to a radius of the positioning member.