Disk rotating motor with bracket defining cylindrical and folded portions, and disk drive device provided with the same

• US 8,737,015 B2
• Filed: 10/09/2012
• Issued: 05/27/2014
• Est. Priority Date: 10/19/2011
• Status: Active Grant

• Current Assignee: Minebea Mitsumi, Inc.
• Original Assignee: Minebea Company Limited (MinebeaMitsumi Inc.)
• Inventors: Nishikata, Toshiyuki, Ishida, Tsuyoshi, Tsuchie, Okihisa
• Primary Examiner(s): EVANS, JEFFERSON A
• Application Number:
  US13/647,755
• Publication Number:
  US 20130100794A1
• Time in Patent Office: 595 Days
• Field of Search: 360/98.07, 360/99.08, 310/67.R
• US Class Current: 360/99.08
• CPC Class Codes: 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
• CPC Class Codes: G11B 19/2036 Motors characterized by fluid-dynamic bearings
• CPC Class Codes: H02K 15/14 Casings; Enclosures; Supports
• CPC Class Codes: H02K 5/16 Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields magnetic bearings H02K7/09

Abstract

A disk rotating motor is provided with: a stator including a stator core and a bracket for fixing the stator core; a rotor that can be rotated with respect to the stator and includes a shaft; and a bearing that rotatably supports the rotary shaft on the outer diameter side of the rotary shaft. The bracket includes a cylindrical portion extending along the shaft and a folded portion formed by folding the upper end of the cylindrical portion onto the outer diameter side. The bearing is fixed to the inner circumferential surface of the cylindrical portion whereas the stator core is fixed to the outer peripheral surface of the folded portion.

Claims

1. A disk rotating motor comprising:

a stator including a stator core and a bracket for fixing said stator core;

a rotor that can be rotated with respect to said stator and includes a rotary shaft; and

a bearing that rotatably supports said rotary shaft on the outer diameter side of said rotary shaft;

said bracket including a cylindrical portion extending along said rotary shaft, and a folded portion formed by folding the end of said cylindrical portion onto the outer diameter side such that at least a coaxial part of the folded portion extends coaxially along an outer circumferential surface of the cylindrical portion, and

said bearing being fixed to an inner circumferential surface of said cylindrical portion whereas said stator core being at least in part fixed to an outer peripheral surface of the coaxial part of said folded portion.

2. The disk rotating motor according to claim 1, wherein said bracket further includes bottom formed by bending the end of said cylindrical portion onto an inner diameter side,

said bottom supporting one end of said rotary shaft.

3. The disk rotating motor according to claim 2, further comprising a thrust plate having a contact surface that is brought into contact with one end of said rotary shaft,

wherein said bottom includes a first bottom in contact with said thrust plate at a surface opposite to said contact surface and a second bottom that is formed by bending said first bottom and surrounds the outer periphery of said thrust plate.

4. The disk rotating motor according to claim 1, further comprising a suction magnet that magnetically sucks said rotor.

5. The disk rotating motor according to claim 4, wherein said suction magnet is fixed at the outer peripheral surface of said bearing in such a manner as to be brought into contact with the boundary between said cylindrical portion and said folded portion.

6. The disk rotating motor according to claim 4, wherein said suction magnet is fixed at the outer peripheral surface of said folded portion in such a manner as to be brought into contact with said stator core.

7. The disk rotating motor according to claim 1, wherein said bracket further includes a separating portion that separates said cylindrical portion and said folded portion from each other on the boundary between said cylindrical portion and said folded portion.

8. A disk drive device comprising:

said disk rotating motor according to claim 1; and

a controller that controls the drive state of said disk rotating motor.