Electricity: motive power systems – Automatic and/or with time-delay means – Responsive to thermal conditions
Reexamination Certificate
2006-03-07
2006-03-07
Martin, David (Department: 2837)
Electricity: motive power systems
Automatic and/or with time-delay means
Responsive to thermal conditions
C700S299000
Reexamination Certificate
active
07009354
ABSTRACT:
Temperature of the disk drive is measured using components of the disk drive without the need of including a separate temperature sensor to optimize performance of the spindle motor during startup. To measure temperature, the resistance of the VCM winding is measured and used to estimate the spindle bearing temperature. Back emf is measured from VCM windings and used during startup to accurately determine actuator position. Because the VCM coil resistance varies significantly with temperature, coil resistance variations with temperature are determined to enable compensation for inaccuracies in determination of actuator velocity. This inferred temperature is then used to optimize the start up procedure for the spindle motor to accommodate the increased frictional loading of the spindle bearing. In this way an improved performance in the reliability and spin up operation time can be realized without the addition of a separate temperature measurement hardware element.
REFERENCES:
patent: 5204593 (1993-04-01), Ueki
patent: 5268804 (1993-12-01), Wallis
patent: 5936788 (1999-08-01), Boutaghou et al.
patent: 6055120 (2000-04-01), Schirle
patent: 6061198 (2000-05-01), Shrinkle
patent: 6078158 (2000-06-01), Heeren et al.
patent: 6088662 (2000-07-01), Flinsbaugh et al.
patent: 6266203 (2001-07-01), Street et al.
patent: 6342985 (2002-01-01), Clare et al.
patent: 6369972 (2002-04-01), Codilian et al.
patent: 6369973 (2002-04-01), Mushika et al.
patent: 6392833 (2002-05-01), Wood et al.
patent: 6493169 (2002-12-01), Ferris et al.
patent: 6512650 (2003-01-01), Tanner
patent: 6594106 (2003-07-01), Serrano et al.
patent: 6731450 (2004-05-01), Codilian et al.
patent: 6744586 (2004-06-01), Ukani et al.
patent: 6754035 (2004-06-01), Francis et al.
patent: 6876606 (2005-04-01), Kajino et al.
patent: 2001/0055231 (2001-12-01), Tsuruta
patent: 2003/0179486 (2003-09-01), Ho et al.
patent: 2003/0191889 (2003-10-01), Forrer
patent: 2003/0202274 (2003-10-01), Onda et al.
patent: 2004/0124799 (2004-07-01), Tanner
patent: 2005/0141375 (2005-06-01), Ehrlich et al.
patent: 19752631 (1998-07-01), None
patent: 05120859 (1993-05-01), None
patent: 2000222815 (2000-08-01), None
patent: 2003173638 (2003-06-01), None
Fliesler & Meyer LLP
Martin David
Matsushita Electric - Industrial Co., Ltd.
Miller Patrick
LandOfFree
Method for spindle bearing friction estimation for reliable... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for spindle bearing friction estimation for reliable..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for spindle bearing friction estimation for reliable... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3555775