# US 10,873,238 B2 · Motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,238 B2 - Document ID: US10873238B2 - Status: Granted - Kind: B2 - Application number: 16/448,082 - Filed: 2019-06-21 - Published: 2020-02-27 - Granted: 2020-12-22 - Earliest claimed: 2018-08-22 - Assignees: Nidec Corporation - Applicants: Nidec Corporation - Inventors: Shinji Takemoto; Keizo Furukawa; Tsuyoshi Hirokawa - Web page: https://patentgrep.com/patent/US10873238B2 ## CPC - H02K 1/14: Stator cores with salient poles - H02K 5/1735: {radially supporting the rotary shaft at only one end of the rotor (H02K5/1737 takes precedence)} - H02K 1/146: {consisting of a generally annular yoke with salient poles} - H02K 1/2791: Surface mounted magnets; Inset magnets - H02K 3/325: {for windings on salient poles, such as claw-shaped poles} - H02K 3/38: around winding heads, equalising connectors, or connections thereto - H02K 3/522: {for generally annular cores with salient poles} - H02K 5/225: {Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132)} - H02K 7/085: {radially supporting the rotary shaft at only one end of the rotor (H02K7/086, H02K7/09 take precedence)} - H02K 11/33: Drive circuits, e.g. power electronics (H02K11/38 takes precedence) - H02K 21/22: with magnets rotating around the armatures, e.g. flywheel magnetos - H02K 2203/03: Machines characterised by the wiring boards, i.e. printed circuit boards or similar structures 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 stationary portion, a rotating portion that includes a shaft rotating about a vertically extending central axis, and a bearing portion that rotatably supports the shaft with respect to the stationary portion. The stationary portion includes a cylindrical bearing housing portion that holds the bearing portion, a stator that is radially outward of the bearing housing portion, a circuit board that is below the stator, and an annular spacer that is between the stator and the bearing housing portion. The stator includes a stator core that includes an annular core back and multiple teeth that extend radially outward from the core back and are arranged in a circumferential direction, an insulating film that covers a surface of the teeth, extends radially inward from a lower surface of the teeth, and covers a lower outer edge portion of the core back, and a coil provided on the teeth. ## Claims ### Claim 1 A motor comprising: a stationary portion; a rotating portion that includes a shaft rotatable about a vertically extending central axis; and a bearing portion that rotatably supports the shaft with respect to the stationary portion; wherein the stationary portion includes: a cylindrical bearing housing portion that holds the bearing portion; a stator that is radially outward of the bearing housing portion; a circuit board that is below the stator; and an annular spacer that is between the stator and the bearing housing portion; the stator includes: a stator core that includes an annular core back and a plurality of teeth that extend radially outward from the core back and are arranged in a circumferential direction; an insulating film that covers a surface of the teeth, extends radially inward from a lower surface of the teeth, and covers a lower outer edge portion of the core back; and a coil provided on the teeth; and the spacer includes: a plurality of side wall portions that contact a radially inner surface of the stator core and a radially outer surface of the bearing housing portion; and a flange portion that protrudes radially outward more than the side wall portion, and contacts a lower inner edge portion of the core back and avoids the insulating film. ### Claim 2 (depends on 1) The motor according to claim 1, wherein the flange portion includes a flange projection that protrudes radially outward; and a gap is provided between an upper surface of the flange projection and a lower surface of the stator. ### Claim 3 (depends on 1) The motor according to claim 1, wherein a lower surface of a flange projection and an upper surface of the circuit board come into contact with each other. ### Claim 4 (depends on 1) The motor according to claim 1, wherein the circuit board includes a through hole through which the bearing housing portion passes; and the spacer includes an engagement claw that protrudes downward and engages with a periphery of the through hole. ### Claim 5 (depends on 4) The motor according to claim 4, wherein the engagement claw includes a standing portion extending downward, and an engagement projection protruding radially outward from a lower end portion of the standing portion; and the engagement projection engages with the through hole. ### Claim 6 (depends on 1) The motor according to claim 1, wherein the stationary portion includes a base portion that extends radially from a lower portion of the bearing housing portion; the circuit board is sandwiched between a base projection protruding from an upper surface of the base portion, and the flange portion; and a lower end of the spacer and an upper surface of the base portion face each other in an axial direction with a gap interposed therebetween. ### Claim 7 (depends on 1) The motor according to claim 1, wherein the stator core includes a stator protrusion that protrudes to a space between the side wall portions from a radially inner surface of the stator core; and the stator protrusion contacts a radially outer surface of the bearing housing portion. ### Claim 8 (depends on 7) The motor according to claim 7, wherein the bearing housing portion is press-fitted into the stator protrusion. ### Claim 9 (depends on 7) The motor according to claim 7, wherein a plurality of stator protrusions are arranged at equal or substantially equal intervals in the circumferential direction. ### Claim 10 (depends on 1) The motor according to claim 1, wherein the side wall portion and the flange portion are alternately arranged adjacent to each other in the circumferential direction. ### Claim 11 (depends on 7) The motor according to claim 7, wherein an upper surface of the flange portion contacts a lower surface of the stator protrusion.