Stepped spindle motor shaft to reduce disk drive acoustic noise

Details Stepped spindle motor shaft to reduce disk drive acoustic noise Stepped spindle motor shaft to reduce disk drive acoustic noise

1995-01-11

1997-04-29

Levy, Stuart S.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

369263, 310 42, 310 51, 464180, G11B 1702, H02K 516, F16C 302

Patent

active

056255110

ABSTRACT:
A spindle motor shaft having variable geometrical features for adjusting the torsion mode frequency of the shaft/stator assembly. The variable geometric features allow the torsion mode frequency to be tuned away from the driving force frequency of the motor. Variable geometrical features for the shaft may include circumferential grooves, radial slots cut through the shaft, or transverse holes disposed along the axis of the shaft. The radial slots have a longitudinal axis that is parallel to the axis of the shaft. Where circumferential grooves are used, the circumferential grooves may be designed to form a locator region along the shaft axis to promote axial alignment of the shaft and stator. Thermal track-misregistration (TMR) or screw torque problems are not introduced in the process of reducing or eliminating the acoustic problem thereby establishing a torsion mode frequency which is not subject to change due to temperature or time. Further, the removal of material from the shaft reduces the torsional stiffness of the shaft and lowers the torsion mode frequency of the shaft. Finally, the use of circumferential grooves prevents the wicking of excess epoxy up the shaft by the movement of the stator during the assembly/manufacturing process, which may lead to an undesirable increase in the stiffness.

REFERENCES:
patent: 4339873 (1982-07-01), Kanamaru et al.
patent: 4585967 (1986-04-01), Mayer et al.
patent: 5227686 (1993-07-01), Ogawa
patent: 5274288 (1993-12-01), Stefansky
patent: 5282100 (1994-01-01), Tacklind et al.
patent: 5346432 (1994-09-01), Greulich et al.
patent: 5354237 (1994-10-01), Amborn et al.
patent: 5357163 (1994-10-01), Minakuchi et al.
patent: 5376850 (1994-12-01), Elsing et al.
patent: 5452156 (1995-09-01), Uda et al.
patent: 5453650 (1995-09-01), Hashimoto et al.
IBM Technical Disclosure Bulletin, vol. 36, No. 9B, Sep. 1993, pp. 41-42, by Ando et al, for "Low-Noise Spindle Motor For Small Hard Disk Drive".
IBM Technical Disclosure Bulletin, vol. 37, No. 10, Oct. 1994, pp. 205-208, by Z. Boutaghou, for "Reducing Motor Excitation To Casting/ Bearings".

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