Spindle motor for reduced size disk drive and method of making same
AssigneeConner Peripherals, Inc.
InventorsGregory J. Blanchette, Paul E. Jessee
Life of this patent
Estimating the term…
Abstract
A spindle motor for two and one-half inch disks and three and one-half inch disks has a disk mounting surface with a horizontal tolerance of less than 30 micro inch to prevent warpage of a disk mounted thereon by pressure engagement. The disk mounting surface is machined to the requisite tolerance by mounting an assembled motor on a support surface of a rigid granite block table and spinning the rotor of the motor by an external drive. A cutting tool then machines the disk mounting surface.
Claims9
In a spindle motor for a disk drive having a stationary coil assembly and housing, the housing having a support flange for mounting on a disk drive base plate and a rotor driven by said coil assembly and having a disk mounting surface, a method of machining said disk mounting surface to a desired tolerance comprising the steps of
- providing a rigid mounting fixture having a cavity for receiving said housing and a support surface for receiving said support flange,
- mounting said housing in said cavity with said support flange engaging said support surface,
- spinning said rotor of said spindle motor, and
- translating a cutting tool across the disk mounting surface to machine said disk mounting surface.
A spindle motor for a disk drive comprising
- a stator assembly including stationary coils,
- a housing for stator assembly including a support flange for mounting said stator assembly on a disk drive base plate, and
- a rotor assembly driven by said coils and having a disk mounting surface defined by an inside diameter and an outside diameter, said disk mounting surface being characterized by planar tolerance of less than 30 micro inches between said inside diameter and said outside diameter.
A spindle motor having a stator assembly including stationary coils, a housing for said stator assembly including a support flange for mounting said stator assembly on a disk drive base plate, and a rotor assembly driven by said coils including a hub having a disk mounting surface, said disk mounting surface being machined to a desired tolerance by the process of
- mounting said housing in a rigid mounting fixture with said support flange engaging a support surface of said fixture,
- spinning said motor assembly by drive means external to said motor, and
- translating a cutting tool across a disk mounting surface to machine said disk mounting surface.
Dependencies are inferred from the claim text.