# US 9,520,754 B2 · Motor and disk drive apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,520,754 B2 - Document ID: US9520754B2 - Status: Granted - Kind: B2 - Application number: 14/220,506 - Filed: 2014-03-20 - Published: 2014-07-24 - Granted: 2016-12-13 - Earliest claimed: 2012-09-28 - Assignees: Nidec Corporation - Applicants: Nidec Corporation - Inventors: Takuro Matsumoto; Atsushi Yawata - Web page: https://patentgrep.com/patent/US9520754B2 ## 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) - G11B 19/2009: {Turntables, hubs and motors for disk drives; Mounting of motors in the drive (means for clamping of disk to turntable G11B17/022 and subgroups)} - H02K 1/187: {to inner stators} - H02K 3/522: {for generally annular cores with salient poles} - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - 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 A motor for use in a disk drive apparatus includes a bearing, a rotary unit, a stator, a thin flat base member, and a cylindrical holder extending in an axial direction. The base member includes a first through-hole, a peripheral edge portion, and a thin portion. The thin portion is located radially outward of the peripheral edge portion. The thin portion has an axial thickness smaller than an axial thickness of the peripheral edge portion. The holder includes a first protrusion portion and a second protrusion portion. The first protrusion portion extends radially outward and is located axially above the peripheral edge portion. The second protrusion portion extends radially outward and is located axially below the peripheral edge portion. The bearing is located inside the holder. A stator core is located radially outside the holder and axially above the thin portion. ## Claims ### Claim 1 A motor, comprising: a bearing; a rotary unit connected to the bearing and configured to rotate about a center axis; a stator including a stator core and at least one coil wound around the stator core; a thin flat base member; and a cylindrical holder extending in an axial direction; wherein the base member includes a first through-hole extending in the axial direction, a peripheral edge portion extending radially outward from the first through-hole, and a thin portion located radially outward of the peripheral edge portion and having an axial thickness smaller than an axial thickness of all other portions of the base member the peripheral edge portion; the holder is located in the first through-hole; the holder includes a first protrusion portion extending radially outward and located axially above the peripheral edge portion and a second protrusion portion extending radially outward and located axially below the peripheral edge portion; the second protrusion portion is located axially above a portion of a lower surface of the base member; the second protrusion portion is located axially below a lower surface of the thin portion and axially below a lower end surface of the holder; the bearing is located inside the holder; the stator core is located outside the holder and axially above the thin portion such that a portion of the thin portion is located directly axially below the stator core; and the second protrusion portion extends in a radial direction, or is deformed in a radial direction, to cover or overlap a lower surface of the peripheral edge portion. ### Claim 2 (depends on 1) The motor of claim 1, wherein the thin portion extends in a circumferential direction about the center axis, and the thin portion is located radially outward of a radial outer end of the first protrusion portion and located radially outward of a radial outer end of the second protrusion portion. ### Claim 3 (depends on 1) The motor of claim 1, wherein a radial length of a region of the first protrusion portion axially opposed to the peripheral edge portion is smaller than a radial length of the peripheral edge portion. ### Claim 4 (depends on 1) The motor of claim 1, wherein the first protrusion portion extends in a circumferential direction along an outer surface of the holder. ### Claim 5 (depends on 1) The motor of claim 1, wherein the stator core is located axially above the first protrusion portion. ### Claim 6 (depends on 5) The motor of claim 5, wherein at least a portion of the coil is located radially outward of the first protrusion portion. ### Claim 7 (depends on 5) The motor of claim 5, wherein the first protrusion portion and the second protrusion portion make contact with the peripheral edge portion. ### Claim 8 (depends on 1) The motor of claim 1, wherein the first protrusion portion and the second protrusion portion make contact with the peripheral edge portion. ### Claim 9 (depends on 1) The motor of claim 1, wherein the stator core is fixed to an outer surface of the first protrusion portion. ### Claim 10 (depends on 1) The motor of claim 1, wherein the second protrusion portion extends radially outward along a lower surface of the peripheral edge portion, and a radial outer end portion of the second protrusion portion is located radially inward of a radial outer end portion of the first protrusion portion. ### Claim 11 (depends on 1) The motor of claim 1, wherein an annular adhesive agent is located between the peripheral edge portion and at least one of the first protrusion portion and the second protrusion portion. ### Claim 12 (depends on 1) A disk drive apparatus, comprising: the motor of claim 1; at least one disk held at the rotary unit; and a housing configured to accommodate the motor and the disk therein.