# US 8,786,148 B2 · Electric motor having support surfaces for maintenance > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,786,148 B2 - Document ID: US8786148B2 - Status: Granted - Kind: B2 - Application number: 13/586,446 - Filed: 2012-08-15 - Published: 2013-09-19 - Granted: 2014-07-22 - Earliest claimed: 2010-02-19 - Assignees: Kabushiki Kaisha Toshiba - Applicants: Nobuyuki Yagi; Satoru Murakami - Inventors: Nobuyuki Yagi; Satoru Murakami - Web page: https://patentgrep.com/patent/US8786148B2 ## CPC - H02K 5/16: Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields (magnetic bearings H02K7/09) - F16C 35/04: in the case of ball or roller bearings - F16C 35/077: between housing and outer race ring - H02K 9/06: with fans or impellers driven by the machine shaft - H02K 15/16: Centring rotors within the stators - H02K 15/50: Disassembling, repairing or modifying dynamo-electric machines (repairing of cooling fluid boxes H02K15/38) - F16C 19/26: with a single row of rollers - F16C 33/6622: {Details of supply and/or removal of the grease, e.g. purging grease} - F16C 2380/26: Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators - H02K 5/1732: {radially supporting the rotary shaft at both ends of the rotor (H02K5/1737 takes precedence)} - H02K 15/14: Casings; Enclosures; Supports - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS ## Abstract According to one embodiment, an electric motor includes a stator, a rotor, bearings and a rotor shaft, in a frame, supporting surfaces on the rotor, and a plurality of threaded holes in the frame, which are configured to receive bolts for pressing the support surfaces from outside. ## Claims ### Claim 1 An electric motor comprising: a stator a frame supporting the stator; a bracket and an end plate configured to close respective ends of the frame; a first bearing housing and a second bearing housing respectively retaining bearings, and respectively fixed to the bracket and the end plate from an outside; a rotor shaft arranged inside the frame and rotatably supported by the bearings; a rotor attached to the rotor shaft and opposing the stator; rotor holders attached to the rotor shaft at respective sides of the rotor and respectively including tapered supporting surfaces; and a plurality of threaded holes for fixing formed respectively in the bracket and the end plate to oppose the tapered supporting surfaces, and into which a supporting member for fixing the rotor that presses the tapered supporting surfaces are configured to be insertable from outside, wherein an insertion direction of the supporting member by the plurality of threaded holes for fixing is a same direction as an axial direction of the rotor shaft, each tapered supporting surface is inclined with respect to an insertion direction of the supporting member by the plurality of threaded holes for fixing, and the supporting member is inserted in the plurality of threaded holes for fixing and presses each of the tapered supporting surfaces. ### Claim 2 (depends on 1) An electric motor according to claim 1, wherein the rotor comprises a rotor core attached to the rotor shaft, and rotor holders attached to the rotor shaft at respective sides of the rotor core and respectively including the supporting surfaces. ### Claim 3 (depends on 1) An electric motor according to claim 1, wherein the rotor comprises a rotor core attached to the rotor shaft, and a first separating plate and a second separating plate attached to the rotor shaft and respectively comprising the supporting surfaces. ### Claim 4 (depends on 1) An electric motor according to claim 1, wherein the rotor comprises a rotor core attached to the rotor shaft, and a ventilating fan and a supporting body attached to the rotor shaft at respective sides of the rotor core and respectively comprising the supporting surfaces. ### Claim 5 An electric motor comprising: a stator; a frame supporting the stator; a bracket and an end plate configured to close respective ends of the frame; a first bearing housing and a second bearing housing respectively retaining bearings, and respectively fixed to the bracket and the end plate from an outside; a rotor shaft arranged inside the frame and rotatably supported by the bearings; a rotor attached to the rotor shaft and opposing the stator; tapered supporting surfaces on the rotor; a plurality of threaded holes formed respectively in the bracket and the end plate to oppose the supporting surfaces, and configured to receive bolts insertable from outside for pressing the supporting surfaces; wherein an insertion direction of the bolts by the plurality of threaded holes for fixing is a same direction as an axial direction of the rotor shaft, each tapered supporting surface is inclined with respect to an insertion direction of the bolts by the plurality of threaded holes for fixing, and the bolts are inserted in the plurality of threaded holes for fixing and press each of the tapered supporting surfaces. ### Claim 6 (depends on 5) An electric motor according to claim 5, wherein the rotor comprises a rotor core attached to the rotor shaft, and core holders attached to the rotor shaft at respective sides of the rotor core and respectively including the supporting surfaces. ### Claim 7 (depends on 6) The electric motor according to claim 6, wherein the supporting surfaces of the core holders comprise tapered surfaces positioned at least at parts on a circumference having the rotor shaft as a center, and the plurality of threaded holes are formed in the bracket and the end plate so as to align on circumferences having the rotor shaft as centers. ### Claim 8 (depends on 5) An electric motor according to claim 5, wherein the rotor comprising a rotor core attached to the rotor shaft, and a first separating plate and a second separating plate attached to the rotor shaft at respective sides of the rotor core and respectively including the supporting surfaces. ### Claim 9 (depends on 8) The electric motor according to claim 8, wherein the supporting surfaces of the first and second separating plates comprise tapered surfaces positioned at least at parts on a circumference having the rotor shaft as a center, and the plurality of threaded holes are formed in the bracket and the end plate so as to align on circumferences having the rotor shaft as centers. ### Claim 10 (depends on 9) The electric motor according to claim 9, wherein annular labyrinths are formed between an outer circumferential portion of the first separating plate and the bracket, and between an outer circumferential portion of the second separating plate and the end plate, respectively. ### Claim 11 (depends on 9) The electric motor according to claim 9, wherein the first separating plate and the second separating plate respectively comprise side surfaces facing the outside, and the tapered surfaces are formed on these side surfaces. ### Claim 12 (depends on 9) The electric motor according to claim 9, wherein the tapered surface is formed on an outer circumferential portion of the first separating plate, and the plurality of threaded holes for fixing is respectively formed to penetrate in a direction substantially perpendicular to the tapered surface. ### Claim 13 (depends on 9) The electric motor according to claim 9, wherein the first separating plate comprises a side surface facing the outside, and a plurality of fins formed on the side surface and extending radially with the rotor shaft as a center, and the tapered surfaces are formed on the fins. ### Claim 14 (depends on 5) An electric motor according to claim 5, wherein the rotor comprising a rotor core attached to the rotor shaft, and a ventilating fan and a supporting body attached to the rotor shaft at respective sides of the rotor core and respectively comprising the supporting surfaces. ### Claim 15 (depends on 14) The electric motor according to claim 14, wherein the supporting surfaces of the ventilating fan and the supporting body comprise tapered surfaces that are positioned at least at parts on circumferences having the rotor shaft as centers, and the plurality of threaded holes for fixing are formed in the bracket and the end plate to align on circumferences having the rotor shaft as centers. ### Claim 16 (depends on 15) The electric motor according to claim 15, wherein the bolts for pressing the rotor comprise tapered surfaces formed at tip end portions thereof, and the tapered surfaces have a substantially identical taper angle as the tapered surface formed on the supporting body.