DATA STORAGE DEVICE

• US 20150146322A1
• Filed: 08/31/2012
• Published: 05/28/2015
• Est. Priority Date: 09/01/2011
• Status: Active Grant

• Current Assignee: Marvell Asia Pte Limited (Marvell Technology Group Limited)
• Original Assignee: Agency For Science Technology and Research (Government of Singapore)
• Inventors: Bi, Chao, Cai, Kui, Chan, Kheong Sann, Ching, Zhi Yong, Elidrissi, Moulay Rachid, Han, Guchang, He, Zhimin, Jiang, Quan, Leong, Siang Huei, Liu, Bo, Ma, Yansheng, Ong, Chun Lian, Shi, Jianzhong, Tan, Sufui Sophia, Wang, Li, Wong, Chiew Leong, Xi, Weiya, Yong, Khai Leong, Yuan, Zhimin, Zhou, Tiejun, Alexopoulos, Pantelis, Santoso, Budi, Zhang, Qide, Mou, Jianqiang, Lee, Chong Wee, Gonzaga, Leonard, Tan, Cheng Peng, Hla Nu, Phyu, Hu, Jiang Feng, Hua, Wei, Lin, Wuzhong, Soh, Cheng Su, Yu, Shengkai, Yu, Yin Quan, Zhang, Jing Liang, Sundaravadivelu, Kannan, Liu, Ningyu, Gan, Ke, See, Boon Long Ibrahim, Lim, Wee Kiat, Liu, Mengjun, Venkatakrishnan, Venkataramanan
• Granted Patent: US 9,202,512 B2
• Time in Patent Office: Days
• US Class Current: 360/99.08
• CPC Class Codes: G11B 19/20 Driving; Starting; Stopping; Control thereof
• 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 2220/235 Multilayer discs, i.e. multiple recording layers accessed from the same side
• CPC Class Codes: G11B 2220/2516 Hard disks
• CPC Class Codes: G11B 27/324 Duty cycle modulation of control pulses, e.g. VHS-CTL-coding systems, RAPID-time code, VASS- or VISS-cue signals
• CPC Class Codes: H02K 3/26 consisting of printed conductors

Abstract

According to an embodiment of the present invention, a data storage device comprising a motor having a stator is disclosed. The stator may include a substrate having a first surface and a second surface opposite to the first surface; and a n-phase winding arrangement having n phase windings; wherein each phase winding comprises m flat fractional-pitch coils arranged on the first surface of the substrate such that the coils are spaced apart uniformly along a closed loop and connected in series; wherein each coil together with an angular section of the substrate between the coil and an adjacent coil of the same phase winding defines a stator pole-pair; and wherein m is an integer larger than 1.

Claims

1. A data storage device comprising a motor having a stator, the stator comprising:

a substrate having a first surface and a second surface opposite to the first surface; and

a n-phase winding arrangement having n phase windings;

wherein each phase winding comprises m flat fractional-pitch coils arranged on the first surface of the substrate such that the coils are spaced apart uniformly along a closed loop and connected in series;

wherein each coil together with an angular section of the substrate between the coil and an adjacent coil of the same phase winding defines a stator pole-pair; and

wherein m is an integer larger than 1.

2. The data storage device according to claim 1, wherein the n-phase winding arrangement is configured such that one coil from one phase winding is arranged adjacent to a coil from another phase winding within each stator pole-pair in a repeated arrangement along the closed loop.

3. The data storage device according to claim 1, wherein each phase winding further comprises a further m flat fractional-pitch coils arranged on the second surface of the substrate such that the m flat fractional-pitch coils of each phase winding are at least substantially in alignment with the further m flat fractional-pitch coils of the same phase winding.

4. The data storage device of claim 3, wherein each coil on the first surface is connected to a corresponding coil of the same phase winding on the second surface of the substrate via one of m through holes formed in the substrate.

5. The data storage device of claim 1, wherein each coil is wound in a concentric arrangement.

6. The data storage device of claim 1, wherein the stator pole-pair comprises 360 electrical degrees in one cycle of flux distribution.

7. The data storage device of claim 6, wherein each coil in each phase winding comprises a coil pitch of about (360/n) electrical degrees.

8. The data storage device of claim 7, wherein each coil in each phase winding of a 3 phase winding comprises a coil pitch of about 120 electrical degrees.

9. The data storage device of claim 1, wherein each coil on the at least one surface of the substrate comprises an axis of rotation substantially perpendicular to the first surface of the substrate.

10. The data storage device of claim 1, wherein the substrate is a printed circuit board and the coils comprises a conductive material printed on the printed circuit board.

11. The data storage device of claim 1, wherein n is an integer.

12. The data storage device of claim 1, further comprising

a base plate, wherein the base plate comprises a substantially circular recess bounded by a wall.

13. The data storage device of claim 12, further comprising

a cover disposed over the base plate.

14. The data storage device of claim 13, wherein the cover comprises at least one selectively indented region configured to increase the stiffness of the cover.

15. The data storage device of claim 14, wherein the at least one selectively indented region comprises a plurality of radial regions and/or a plurality of radial arc-shaped regions.

16. The data storage device of claim 13, wherein the cover further comprises a planar surface with a plurality of stiffening ribs.

17. The data storage device of claim 13, further comprising

an indented pad disposed on a surface of the cover facing away from a disk.

18. The data storage device of claim 13, further comprising

a shock absorption system configured to prevent the cover from touching a surface of a disk when the cover is subjected to external forces.

19. The data storage device of claim 18, wherein the shock absorption system comprises a plurality of shock absorbers.

23. The data storage device of claim 19, further comprising

an actuator.

20-22. -22. (canceled)

24-64. -64. (canceled)