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US 7,453,221 B1Granted
System for controlling rotation of a disk drive
AssigneeMarvell International Ltd.
InventorsKuno Shinichiro, Ravishanker Krishnamoorthy, Foo Leng Leong, Cheng Yong Teoh
Life of this patent
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Abstract
A disk drive system is set forth that comprises a rotatable storage medium adapted to store data, a spindle motor disposed to rotate the rotatable storage medium, and a spindle motor control system. The spindle motor control system brakes rotation of the spindle motor in response to inductive sensing of the rotation of the spindle motor.
Claims11
A disk drive system comprising:
- a rotatable storage medium adapted to store data;
- a spindle motor disposed to rotate the rotatable storage medium;
- a control system operating to inductively sense spindown of the spindle motor by
- executing an inductive sensing cycle through all states, S1 through Stotal, of the spindle motor to determine a minimum current rise time value, Tmin1, occurring at a spindle motor state, Smin1, and
- executing a further inductive sensing cycle through all states, S1 through Stotal, of the spindle motor to determine a further minimum current rise time value, Tmin2, occurring at a spindle motor state Smin2,
- where the control system executes a braking operation of the spindle motor and re-executes the inductive sensing cycle and further inductive sensing cycle if Smin1 is different from Smin2.
3 more elements
A disk drive system comprising:
- rotatable storage means for storing data;
- spindle motor means for rotating the rotatable storage means;
- spindle motor control means for controlling the spindle motor means, where the spindle motor control means inductively senses spindown of the spindle motor means by
- executing an inductive sensing cycle through all states, S1 through Stotal, of the spindle motor means to determine a minimum current rise time value, Tmin1, occurring at a state, Smin1, of the spindle motor means, and
- executing a further inductive sensing cycle through all states, S1 through Stotal, of the spindle motor means to determine a further minimum current rise time value, Tmin2, occurring at a state Smin2 of the spindle motor means,
- where the spindle motor control means executes a braking operation of the spindle motor means and re-executes the inductive sensing cycle and further inductive sensing cycle if Smin1 is different from Smin2.
3 more elements
A process for operating a disk drive system comprising:
- storing data on a rotatable storage medium;
- rotating the rotatable storage medium with a spindle motor;
- inductively sensing spindown of the spindle motor by
- executing an inductive sensing cycle through all states, S1 through Stotal, of the spindle motor to determine a minimum current rise time value, Tmin1, occurring at a state, Smin1, of the spindle motor, and
- executing a further inductive sensing cycle through all states, S1 through Stotal, of the spindle motor to determine a further minimum current rise time value, Tmin2, occurring at a state Smin2 of the spindle motor,
- executing a braking operation of the spindle motor and re-executing the inductive sensing cycle and further inductive sensing cycle if Smin1 is different from Smin2.
3 more elements
Dependencies are inferred from the claim text.