Data storage device controlling amplitude and phase of driving voltage to generate power from a spindle motor
First Claim
1. A data storage device comprising:
- a disk;
a spindle motor configured to rotate the disk, wherein the spindle motor comprises a plurality of windings;
a head actuated over the disk; and
control circuitry powered by a supply voltage, the control circuitry configured to;
commutate the windings of the spindle motor based on a commutation sequence while applying a periodic driving voltage to each winding, wherein the periodic driving voltage comprises an operating amplitude during normal operation; and
when the supply voltage falls below a threshold, configure the spindle motor into a power generator by at least adjusting the amplitude and a phase of the periodic driving voltage so that a periodic current flowing through each winding is substantially opposite in phase from a sinusoidal back electromotive force (BEMF) voltage generated by each winding,wherein adjusting the amplitude and the phase of the periodic driving voltage comprises adjusting at least one of the amplitude and the phase based on an amplitude of the sinusoidal BEMF voltage, a resistance of the windings, and an inductance of the windings.
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Accused Products
Abstract
A data storage device is disclosed comprising a disk, a spindle motor configured to rotate the disk, wherein the spindle motor comprises a plurality of windings, and a head actuated over the disk. The windings of the spindle motor are commutated based on a commutation sequence while applying a periodic driving voltage to each winding, wherein the periodic driving voltage comprises an operating amplitude during normal operation. When a supply voltage falls below a threshold, the spindle motor is configured into a power generator by at least adjusting the amplitude and a phase of the periodic driving voltage so that a periodic current flowing through each winding is substantially opposite in phase from a sinusoidal back electromotive force (BEMF) voltage generated by each winding.
381 Citations
27 Claims
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1. A data storage device comprising:
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a disk; a spindle motor configured to rotate the disk, wherein the spindle motor comprises a plurality of windings; a head actuated over the disk; and control circuitry powered by a supply voltage, the control circuitry configured to; commutate the windings of the spindle motor based on a commutation sequence while applying a periodic driving voltage to each winding, wherein the periodic driving voltage comprises an operating amplitude during normal operation; and when the supply voltage falls below a threshold, configure the spindle motor into a power generator by at least adjusting the amplitude and a phase of the periodic driving voltage so that a periodic current flowing through each winding is substantially opposite in phase from a sinusoidal back electromotive force (BEMF) voltage generated by each winding, wherein adjusting the amplitude and the phase of the periodic driving voltage comprises adjusting at least one of the amplitude and the phase based on an amplitude of the sinusoidal BEMF voltage, a resistance of the windings, and an inductance of the windings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A data storage device comprising:
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a disk; a spindle motor configured to rotate the disk, wherein the spindle motor comprises a plurality of windings; a head actuated over the disk; and control circuitry powered by a supply voltage, the control circuitry configured to; commutate the windings of the spindle motor based on a commutation sequence while applying a periodic driving voltage to each winding, wherein the periodic driving voltage comprises an operating amplitude during normal operation; and when the supply voltage falls below a threshold, configure the spindle motor into a power generator by at least; comparing the supply voltage to a target voltage to generate an error signal; and adjusting the amplitude and a phase of the periodic driving voltage based on the error signal. - View Dependent Claims (10)
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11. A method of operating a data storage device, the method comprising:
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rotating a disk using a spindle motor comprising a plurality of windings; actuating a head over the disk; commutating the windings of the spindle motor based on a commutation sequence while applying a periodic driving voltage to each winding, wherein the periodic driving voltage comprises an operating amplitude during normal operation; and when a supply voltage for powering the data storage device falls below a threshold, configuring the spindle motor into a power generator by at least adjusting the amplitude and a phase of the periodic driving voltage so that a periodic current flowing through each winding is substantially opposite in phase from a sinusoidal back electromotive force (BEMF) voltage generated by each winding, wherein adjusting the amplitude and the phase of the periodic driving voltage comprises adjusting at least one of the amplitude and the phase based on an amplitude of the sinusoidal BEMF voltage, a resistance of the windings, and an inductance of the windings. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method of operating a data storage device, the method comprising:
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rotating a disk using a spindle motor comprising a plurality of windings; actuating a head over the disk; commutating the windings of the spindle motor based on a commutation sequence while applying a periodic driving voltage to each winding, wherein the periodic driving voltage comprises an operating amplitude during normal operation; and when a supply voltage for powering the data storage device falls below a threshold, configuring the spindle motor into a power generator by at least; comparing the supply voltage to a target voltage to generate an error signal; and adjusting the amplitude and a phase of the periodic driving voltage based on the error signal. - View Dependent Claims (20)
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21. Control circuitry powered by a supply voltage, the control circuitry configured to:
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commutate windings of a spindle motor based on a commutation sequence while applying a periodic driving voltage to each winding, wherein the periodic driving voltage comprises an operating amplitude during normal operation; and when the supply voltage falls below a threshold, configure the spindle motor into a power generator by at least adjusting the amplitude and a phase of the periodic driving voltage so that a periodic current flowing through each winding is substantially opposite in phase from a sinusoidal back electromotive force (BEMF) voltage generated by each winding, wherein adjusting the amplitude and the phase of the periodic driving voltage comprises adjusting at least one of the amplitude and the phase based on an amplitude of the sinusoidal BEMF voltage, a resistance of the windings, and an inductance of the windings. - View Dependent Claims (22, 23, 24, 25)
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26. Control circuitry powered by a supply voltage, the control circuitry configured to:
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commutate windings of a spindle motor based on a commutation sequence while applying a periodic driving voltage to each winding, wherein the periodic driving voltage comprises an operating amplitude during normal operation; and when the supply voltage falls below a threshold, configure the spindle motor into a power generator by at least; comparing the supply voltage to a target voltage to generate an error signal; and adjusting the amplitude and a phase of the periodic driving voltage based on the error signal. - View Dependent Claims (27)
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Specification