# US 12,603,553 B2 · Method of manufacturing coil, coil, and electric motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,603,553 B2 - Document ID: US12603553B2 - Status: Granted - Kind: B2 - Application number: 18/118,494 - Filed: 2023-03-07 - Published: 2023-10-12 - Granted: 2026-04-14 - Earliest claimed: 2022-03-22 - Assignees: Mitsubishi Heavy Industries, Ltd. - Applicants: Mitsubishi Heavy Industries, Ltd. - Inventors: Takeshi Ikemi; Akiko Kasami; Takashi Arai; Satoshi Nakatsuka - Web page: https://patentgrep.com/patent/US12603553B2 ## CPC - H02K 3/18: Windings for salient poles - H02K 15/043: winding flat conductive wires or sheets - H02K 1/16: Stator cores with slots for windings - H02K 1/22: Rotating parts of the magnetic circuit - H02K 3/12: arranged in slots - H02K 3/48: in slots - H02K 15/0431: {Concentrated windings} - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract A method of manufacturing a coil includes: a step of forming a winding portion extending twisting around an axis along a direction of the axis, the winding portion including a portion in an extending direction of the winding portion, the portion being a deformation allowing portion having a lower rigidity than the other portion; a step of forming an insulation film on the winding portion in the extending direction of the winding portion; and a step of compressing the winding portion on which the insulation film is formed, in the direction of the axis. ## Claims ### Claim 1 A method of manufacturing a coil, comprising: forming a winding portion extending twisting around an axis along a direction of the axis, the winding portion having a spiral shape such that an outer dimension of the winding portion as viewed in the direction of the axis gradually decreases, the winding portion including a portion in an extending direction of the winding portion, the portion being a deformation allowing portion having a lower rigidity than other portion; forming an insulation film on the winding portion over the extending direction of the winding portion; and compressing the winding portion on which the insulation film is formed, in the direction of the axis, such that the winding portion has a flat shape, wherein the winding portion has the spiral shape such that the outer dimension of the winding portion as viewed in the direction of the axis gradually decreases, with none of a portion of the winding portion overlapping another portion of the winding portion. ### Claim 2 (depends on 1) The method of manufacturing a coil according claim 1, wherein the deformation allowing portion is a groove extending in the direction of the axis from an end face of the winding portion facing the direction of the axis. ### Claim 3 (depends on 2) The method of manufacturing a coil according to claim 2, wherein applying a masking covering an inner surface of the groove is performed before the forming the insulation film, and removing the masking is performed after the forming the insulation film. ### Claim 4 (depends on 3) The method of manufacturing a coil according to claim 3, wherein applying a conductive material to the inner surface of the groove is performed after the removing the masking. ### Claim 5 (depends on 1) The method of manufacturing a coil according to claim 1, wherein the deformation allowing portion is a slit extending in the extending direction of the winding portion and penetrating through the winding portion in a direction orthogonal to the axis. ### Claim 6 (depends on 1) The method of manufacturing a coil according claim 1, wherein the deformation allowing portion is a plurality of holes penetrating through the winding portion in a direction orthogonal to the axis. ### Claim 7 (depends on 1) The method of manufacturing a coil according to claim 1, wherein forming a gripping portion protruding from the winding portion in the direction of the axis is performed after the forming the winding portion. ### Claim 8 (depends on 7) The method of manufacturing a coil according to claim 7, wherein, in the forming the gripping portion, the gripping portion is formed integrally with the winding portion by using a three-dimensional additive manufacturing method. ### Claim 9 A coil comprising: a winding portion having an annular shape centered on an axis, the winding portion extending toward an inner periphery side along a circumferential direction of the axis, the winding portion having a flat shape; an insulation film covering the winding portion from outside; and a deformation allowing portion formed at a portion of the winding portion in an extending direction of the winding portion and having a lower rigidity than the other portion, wherein the winding portion has a spiral shape such that an outer dimension of the winding portion as viewed in the direction of the axis gradually decreases, with none of a portion of the winding portion overlapping another portion of the winding portion. ### Claim 10 (depends on 9) The coil according to claim 9, wherein the deformation allowing portion is a notch extending in the direction of the axis from an end face of the winding portion facing the direction of the axis. ### Claim 11 (depends on 9) The coil according to claim 9, wherein the deformation allowing portion is a slit extending in the extending direction of the winding portion and penetrating through the winding portion in a direction orthogonal to the axis. ### Claim 12 (depends on 9) The coil according to claim 9, wherein the deformation allowing portion is a plurality of holes penetrating through the winding portion in a direction orthogonal to the axis. ### Claim 13 (depends on 9) An electric motor comprising: a rotor configured to rotate about a central axis; and a stator covering the rotor from an outer periphery side of the rotor, wherein the stator including a stator core including a yoke having an annular shape centered on the central axis, and a plurality of teeth protruding from an inside surface of the yoke and arranged at intervals in a circumferential direction, and the coil according to claim 9, the coil being attached covering outside surfaces of the teeth.