Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Reexamination Certificate
2007-08-07
2007-08-07
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
C318S273000, C318S259000, C360S073030, C360S074100
Reexamination Certificate
active
10856320
ABSTRACT:
A disk drive is disclosed comprising a spindle motor having a plurality of windings including at least a first winding, a second winding, and a third winding. During a spin-up operation, a voltage is applied to the first winding and a first rise time is measured for current flowing through the first winding to reach a predetermined threshold. A voltage is applied to the second winding and a second rise time is measured for current flowing through the second winding to reach a predetermined threshold. A voltage is applied to the third winding and a third rise time is measured for current flowing through the third winding to reach a predetermined threshold. A difference is computed in response to the first rise time, the second rise time, and the third rise time, and an angular position of the spindle motor is estimated by computing an arctangent in response to the difference.
REFERENCES:
patent: 5122998 (1992-06-01), Mizuno et al.
patent: 5530326 (1996-06-01), Galvin et al.
patent: 5569990 (1996-10-01), Dunfield
patent: 6100656 (2000-08-01), El-Sadi et al.
patent: 6104153 (2000-08-01), Codilian et al.
patent: 6198590 (2001-03-01), Codilian et al.
patent: 6369541 (2002-04-01), Albert
patent: 6549359 (2003-04-01), Bennett et al.
patent: 6549361 (2003-04-01), Bennett et al.
patent: 6574062 (2003-06-01), Bennett et al.
patent: 6577465 (2003-06-01), Bennett et al.
patent: 7158329 (2007-01-01), Ryan
patent: 2002/0171380 (2002-11-01), Heydt et al.
Ding Jianghong
Ji Chuanwen
Nguyen David D.
Donovan Lincoln
Glass Erick
Sheerin, Esq. Howard H.
Western Digital Technologies Inc.
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