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| I claim: 1. An electrically surge protected submersible motor comprising a housing in communication ... |
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| Submersible pump |
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| Submersible pump support |
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| Submersible motor unit |
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| Submersible motor unit |
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| End shield constructed with a separate component holder |
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| Cover for electric motor |
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| Integrated motor/generator/flywheel utilizing a solid steel rotor |
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Disk-drive motor rotating on a magnetically counterbalanced single hydrodynamic thrust bearing
| Details |
Inventors: Ichiyama, Yoshikazu;
Assignee: Nidec Corporation (Kyoto, JP)
Primary Examiner: Nguyen; Hoa T.
Assistant Examiner: Watko; Julie Anne
Attorney, Agent or Firm: Judge; James
Reduced axial height, compact disk-drive motor rotating on a hydrodynamic radial bearing and a magnetically counterbalanced single hydrodynamic thrust bearing. The single hydrodynamic thrust bearing is configured between the underside of the rotor hub and the adjacent end face of a support cylinder in which the motor shaft rotates. To make the motor rotationally operable, instead of another hydrodynamic thrust bearing, the reduced axial-height configuration employs magnetic counterbalancing means associated with the cylindrical wall of the rotor hub. The magnetic counterbalancing means counterbalances thrust hydrodynamic lifting pressure generated in the single thrust-hydrodynamic pressure bearing and acting on the rotor hub when it spins. |
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DETAILED DESCRIPTION A motor for a hard disk drive device in accordance with several embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Specifically, FIG.
1 shows a hard disk drive for use in, for example, a computer system.
The hard disk drive includes a housing 200, a hard disk 208, a motor M (described in greater detail below) and a clamp member 212.
The housing 200 includes a base member 202 and an upper lid 206.
The motor M is supported on the base member 202 and the hard disk 208 is supported by a rotor hub (described below) of the motor.
The upper lid 206 along with the base member 202 covers and protects the motor and hard disk 208 by forming a sealed, dust free space 204.
The clamp member 212 is fixed to the rotor hub of the motor M by a screw 210 for supporting the hard disk 208.
The motor M of the hard disk drive shown in FIG.
1, in accordance with the present invention, includes several embodiments that are described below.
In the following description of the various embodiments of the motor M, reference is made to upper and lower portions of the various members.
It should be understood that the directions upper and lower are relative to the orientation of the motor in, for instance, FIGS.
2A, 2D, 3A, 3D, 4A, 4D, 5A and 5D, and not to any specific orientation of the motor M since the motor of the present invention may be oriented in any of a variety of ways.
First Embodiment FIGS.
2A, 2B, 2C and 2D show a first embodiment of the motor M.
The first embodiment of the motor M is identified in FIG.
2A as a motor 10 that includes a rotor hub 12, a shaft 14, an annular support body 16, a disk-shaped cover 18, a supporting cylinder 20, a bracket 22, lubricant 24 such as lubricating oil, a radial bearing 28, a thrust bearing 32, a stator 34, and a rotor magnet 36, all described in greater detail below.
An overview of the structure of the motor 10 is described below.
The bracket 22 of the motor 10 is fixedly attached to the base member 202 of the hard disk drive shown in FIG
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