# US 11,444,504 B2 · Stator core end caps > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,444,504 B2 - Document ID: US11444504B2 - Status: Granted - Kind: B2 - Application number: 16/773,661 - Filed: 2020-01-27 - Published: 2020-05-21 - Granted: 2022-09-13 - Earliest claimed: 2014-12-05 - Assignees: Nidec Motor Corporation - Applicants: Nidec Motor Corporation - Inventors: Joshua M. Biro; William D. Moore - Web page: https://patentgrep.com/patent/US11444504B2 ## CPC - H02K 5/04: Casings or enclosures characterised by the shape, form or construction thereof - B60B 27/0015: {for driven wheels} - B60B 27/0021: {characterised by torque transmission means from drive axle} - B60B 27/0026: {of the radial type, e.g. splined key} - F16C 19/10: for axial load mainly - F16C 19/30: for axial load mainly - F16C 33/366: {Tapered rollers, i.e. rollers generally shaped as truncated cones} - F16H 1/06: with parallel axes - F16H 1/20: involving more than two intermeshing members - F16H 55/0806: {Involute profile} - F16H 55/17: Toothed wheels (worm wheels F16H55/22; chain wheels F16H55/30) - F16H 57/021: Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings - F16H 57/022: Adjustment of gear shafts or bearings (for compensating misalignment of axes of toothed gearings without orbital motion F16H1/26; for compensating misalignment of axes of planetary gears F16H1/48) - F16H 57/029: characterised by means for sealing the gearboxes, e.g. to improve airtightness - F16H 57/0457: {Splash lubrication} - F16H 57/12: Arrangements for adjusting or for taking-up backlash not provided for elsewhere - H02K 1/148: {Sectional cores (H02K1/141 takes precedence)} - H02K 3/28: Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) - H02K 3/522: {for generally annular cores with salient poles} - H02K 5/10: with arrangements for protection from ingress, e.g. water or fingers - H02K 5/225: {Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132)} - H02K 7/116: with gears - 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) - H02K 11/21: Devices for sensing speed or position, or actuated thereby (specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14) - H02K 11/25: Devices for sensing temperature, or actuated thereby - H02K 21/16: having annular armature cores with salient poles (with homopolar co-operation H02K21/20) - F16C 19/547: {with two angular contact rolling bearings} - F16C 2361/61: Toothed gear systems, e.g. support of pinion shafts - F16C 2380/27: Motor coupled with a gear, e.g. worm gears - F16H 1/08: the members having helical, herringbone, or like teeth - F16H 2057/0221: {Axial adjustment} - F16H 2057/127: {using springs} - G11B 17/00: Guiding record carriers not specifically of filamentary or web form, or of supports therefor (guiding cards or sheets G06K13/00) - H02K 1/185: {to outer stators} - H02K 5/18: with ribs or fins for improving heat transfer - 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}) - B60B: VEHICLE WHEELS (making wheels or wheel parts by rolling B21H1/00, by forging, hammering or pressing B21K1/28); CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - F16H: GEARING - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract Electric motors are disclosed. The motors are preferably for use in an automated vehicle, although any one or more of a variety of motor uses are suitable. The motors include lift, turntable, and locomotion motors. ## Claims ### Claim 1 A stator comprising: a generally toroidal core presenting axially opposed upper and lower core faces; an electrically insulative upper end cap fitted to the core; and an electrically insulative lower end cap fitted to the core, said upper and lower end caps extending toward each other and between the upper and lower core faces, said upper end cap including upper interengaging structure, said lower end cap including lower interengaging structure, said upper and lower interengaging structures engaging one another at a juncture, such that said upper and lower end caps cooperatively encompass at least part of the core, said core including a generally radially extending tooth, said tooth presenting axially opposed upper and lower tooth faces at least in part defining respective ones of the upper and lower core faces, said tooth further presenting a pair of side faces each extending between and interconnecting the upper and lower tooth faces, said upper end cap fitted to the tooth to at least in part extend along the upper tooth face and down each of the side faces toward the lower end cap, said lower end cap fitted to the tooth to at least in part extend along the lower tooth face and up each of the side faces toward the upper end cap, said upper and lower end caps cooperatively encompassing at least part of the tooth, said tooth including a generally radially extending arm at least in part defining each of said side faces, said upper end cap including an upper arm portion corresponding to said arm, said lower end cap including a lower arm portion corresponding to said arm, said upper and lower arm portions cooperatively fully and continuously encircling said arm. ### Claim 2 (depends on 1) The stator of claim 1, said upper and lower interengaging structures overlapping one another along the juncture. ### Claim 3 (depends on 1) The stator of claim 1, a first one of said upper and lower interengaging structures including a projection, a second one of said upper and lower interengaging structures including a receiver, said projection being received by the receiver along the juncture. ### Claim 4 (depends on 3) The stator of claim 3, said projection comprising an axially projecting tab, said receiver comprising an axially extending recess, said tab being received in said recess at said juncture. ### Claim 5 (depends on 1) The stator of claim 1, said upper end cap at least in part extending along the upper core face, said lower end cap at least in part extending along the lower core face. ### Claim 6 (depends on 1) The stator of claim 1, said juncture being disposed axially between said upper and lower core faces. ### Claim 7 (depends on 1) The stator of claim 1, said stator further comprising wiring, said upper and lower end caps at least in part restricting movement of said wiring. ### Claim 8 (depends on 1) The stator of claim 1, said stator further comprising wiring, said upper and lower end caps being at least in part disposed between said wiring and said core. ### Claim 9 (depends on 1) The stator of claim 1, said stator including a plurality of said upper end caps and a plurality of said lower end caps, said stator being devoid of additional insulative structure in engagement with the core. ### Claim 10 (depends on 1) The stator of claim 1, said tooth further including a generally circumferentially extending yoke and a generally circumferentially extending crown, said arm extending between and interconnecting said yoke and said crown, said arm, said crown, and said yoke cooperatively presenting each of said side faces, said upper end cap including an upper yoke portion corresponding to the yoke and an upper crown portion corresponding to the crown, said lower end cap including a lower yoke portion corresponding to the yoke and a lower crown portion corresponding to the crown, said upper and lower arm portions, said upper and lower yoke portions, and said upper and lower crown portions cooperatively overlying the entireties of each of the tooth side faces. ### Claim 11 (depends on 10) The stator of claim 10, said upper and lower crown portions cooperatively fully and continuously encircling said crown. ### Claim 12 (depends on 10) The stator of claim 10, said juncture extending continuously along said arm, said yoke, and said crown. ### Claim 13 (depends on 1) The stator of claim 1, said juncture extending along each of said side faces. ### Claim 14 (depends on 1) The stator of claim 1, said stator further comprising wiring, said upper and lower end caps being at least in part disposed between said wiring and said core. ### Claim 15 (depends on 14) The stator of claim 14, said tooth including a generally radially extending arm and a yoke extending generally circumferentially from the arm, said upper end cap including an upper yoke portion corresponding to said yoke, said lower end cap including a lower yoke portion corresponding to said yoke, said upper and lower yoke portions each including an axially projecting retaining wall portion configured to restrict radial movement of the wiring. ### Claim 16 (depends on 15) The stator of claim 15, said tooth further including a crown extending generally circumferentially from the arm, said upper end cap including an upper crown portion corresponding to said crown, said lower end cap including a lower crown portion corresponding to said crown, said upper and lower crown portions each including a wire retention portion configured to restrict radial movement of the wiring. ### Claim 17 (depends on 1) The stator of claim 1, said core comprising a plurality of said generally radially extending teeth, said stator comprising a plurality of said upper end caps and a plurality of said lower end caps, each of said upper and lower end caps corresponding to one of said teeth. ### Claim 18 (depends on 1) The stator of claim 1, said upper and lower end caps being identical to each other.