# US 10,374,480 B2 · Motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,374,480 B2 - Document ID: US10374480B2 - Status: Granted - Kind: B2 - Application number: 15/751,182 - Filed: 2016-08-05 - Published: 2018-08-16 - Granted: 2019-08-06 - Earliest claimed: 2015-08-10 - Assignees: Nidec Corporation - Applicants: Nidec Corporation - Inventors: Hidehiro Haga; Yu Asahi; Takao Atarashi; Shunsuke Murakami; Satomi Takei - Web page: https://patentgrep.com/patent/US10374480B2 ## CPC - H02K 3/50: Fastening of winding heads, equalising connectors, or connections thereto - H02K 3/38: around winding heads, equalising connectors, or connections thereto - H02K 1/2753: the rotor consisting of magnets or groups of magnets arranged with alternating polarity - H02K 5/1732: {radially supporting the rotary shaft at both ends of the rotor (H02K5/1737 takes precedence)} - H02K 2203/09: Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract A motor includes a shaft disposed along a central axis extending in an up-down direction, a rotor assembly mounted on the shaft, a stator radially facing the rotor assembly with a clearance therebetween, and a plurality of busbars electrically connected to the stator. The busbar includes a first busbar and a second busbar. The first busbar has an upper disposed portion that is disposed above the second busbar. The second busbar has a busbar cavity that is recessed downward at a position that overlaps with the upper disposed portion in an axial direction. ## Claims ### Claim 1 A motor comprising: a shaft disposed along a central axis that extends in an up-down direction; a rotor assembly mounted on the shaft; a stator radially facing the rotor assembly with a clearance therebetween; and a plurality of busbars electrically connected to the stator, wherein the busbars include a first busbar and a second busbar, the first busbar has an upper disposed portion that is disposed above the second busbar, and the second busbar has a busbar cavity that is recessed downward at a position that overlaps with the upper disposed portion in an axial direction. ### Claim 2 (depends on 1) The motor according to claim 1, wherein the first busbar has a first busbar body portion that extends in a circumferential direction, and a first connection terminal that extends in a radial direction from the first busbar body portion, the second busbar has a second busbar body portion that extends in the circumferential direction, and a second connection terminal that extends in the radial direction from the second busbar body portion, and the first busbar body portion and the second busbar body portion are disposed along a plane orthogonal to the central axis. ### Claim 3 (depends on 2) The motor according to claim 2, wherein the first busbar body portion and the second busbar body portion are at the same position in an axial direction. ### Claim 4 (depends on 2) The motor according to claim 2, wherein the first busbar body portion and the second busbar body portion are aligned in the radial direction, the upper disposed portion is at least part of the first connection terminal, and the busbar cavity is positioned in the second busbar body portion. ### Claim 5 (depends on 4) The motor according to claim 4, wherein the second busbar body portion has a busbar protrusion that protrudes downward at a position that overlaps with the busbar cavity in an axial direction. ### Claim 6 (depends on 5) The motor according to claim 5, further comprising: a busbar holder that holds the busbars, wherein the busbar holder has a holder cavity that is recessed downward, and at least part of the busbar protrusion is disposed in the holder cavity. ### Claim 7 (depends on 6) The motor according to claim 6, wherein the busbar holder has a holder protrusion that protrudes downward at a position that overlaps with the holder cavity in an axial direction. ### Claim 8 (depends on 5) The motor according to claim 5, further comprising: a busbar holder that holds the busbars, wherein the busbar holder has a holder-through-hole that penetrates the busbar holder in an axial direction, and at least part of the busbar protrusion is disposed in the holder through hole. ### Claim 9 (depends on 4) The motor according to claim 4, wherein cross sectional areas which are orthogonal to the circumferential direction of the second busbar body portion are uniform in a portion at which the busbar cavity is positioned and in portions that are positioned on both circumferential sides of the busbar cavity. ### Claim 10 (depends on 4) The motor according to claim 4, wherein the upper disposed portion is disposed above the busbar cavity. ### Claim 11 (depends on 4) The motor according to claim 4, wherein at least part of the upper disposed portion is disposed in the busbar cavity. ### Claim 12 (depends on 11) The motor according to claim 11, wherein an entirety of the upper disposed portion is disposed in the busbar cavity. ### Claim 13 (depends on 4) The motor according to claim 4, wherein the stator includes a plurality of coils, the coils each have a coil end that is an end of a conductive wire, the first connection terminal includes a first extension that extends in the radial direction from the first busbar body portion, and a first connector that is disposed at a radial end of the first extension and connected to the coil end, the second connection terminal includes a second extension that extends in the radial direction from the second busbar body portion, and a second connector that is disposed at a radial end of the second extension and connected to the coil end, and the upper disposed portion is at least part of the first extension. ### Claim 14 (depends on 13) The motor according to claim 13, wherein the first connector and the second connector are at the same position in an axial direction. ### Claim 15 (depends on 4) The motor according to claim 4, wherein a portion at which the busbar cavity is positioned on the second busbar body portion is curved.