Patent ID: 6822775
Filing Date: 2004-11-23
Classification: H02K

Abstract:
A high speed rotating apparatus, comprising:a shaft which is fixed; a hollow rotary body into which said shaft is inserted forming a dynamic pressure air bearing in a ring-shaped air space between said rotary body and said shaft, said rotary body further comprising: a first rotary member having an inner circumferential surface facing said dynamic pressure air bearing which is held for rotation along an outer circumferential surface of said shaft by said dynamic pressure air bearing; a second rotary member having an inner circumferential surface facing an outer circumferential surface of said first rotary member which is fixed to said outer circumferential surface of said first rotary member through a hardening insertion process; and a motor configured to drive said rotary body to rotate, the motor including a rotor magnet secured to the second rotary member by press-fitting; and wherein said hardening insertion process results in a tensile strength of said first rotary member being greater than a tensile stress to be produced in an axial direction in said inner circumferential surface of said first rotary member.