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
C318S132000, C318S254100, C318S434000, C318S432000, C318S434000, C318S453000, C318S474000, C360S073030, C360S075000, C360S078060
Reexamination Certificate
active
11031746
ABSTRACT:
Embodiments of the invention provide a way to accurately detect the position of a spindle motor. In a spindle motor startup process according to one embodiment, a parameter setup section acquires from a parameter table a sense time value corresponding to an input voltage that is acquired from an ADC. The parameter setup section sets the sense time value in a register. A position determination section, which is within an SPM driver, performs an induced voltage detection process for rotor position detection purposes during the time corresponding to the sense time value that is set in the register. Even when the input voltage is decreased, rotor position detection can be properly achieved by changing the sense time value in accordance with a change in the input voltage.
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Hayashi Yukiko
Ikedo Gaku
Koide Nobuhisa
Shimada Shougo
Duncan Patrick
Smith Tyrone
Townsend and Townsend / and Crew LLP
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