Reducing noise in back EMF sensing for data storage
AssigneeWestern Digital Technologies, Inc.
InventorsGuoxiao Guo, Jianbin Nie, Triet Tieu, Duc H. Banh, Tianyu Jiang
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Abstract
Various illustrative aspects are directed to a data storage device comprising: a voice coil motor (VCM) and one or more processing devices, configured to actuate the VCM, switch on measuring a back electromotive force (BEMF) from the VCM for intervals of an initial BEMF measurement that are free of spikes in the initial BEMF measurement, and process a measured BEMF signal from the intervals of the initial BEMF measurement that are free of spikes in a change of current term of the initial BEMF measurement.
Claims23
A data storage device comprising:
- a voice coil motor (VCM);
- and
- one or more processing devices, configured to:
- actuate the VCM;
- switch on measuring a back electromotive force (BEMF) from the VCM for intervals of an initial BEMF measurement that are free of spikes in the initial BEMF measurement, free of spikes being indicative of amplitude measurements not exceeding 5% of a peak amplitude of a preceding interval where a spike has occurred;
- and
- process a measured BEMF signal from the intervals of the initial BEMF measurement that are free of spikes in a change of current term of the initial BEMF measurement.
A method of operating a data storage device, comprising:
- actuating, by one or more processing devices, a voice coil motor (VCM);
- selectively switching on, by the one or more processing devices, measurement of a back electromotive force (BEMF) from the VCM for intervals of an initial BEMF measurement in the initial BEMF measurement, based on a measurement of spikes, to reduce spikes in a change of current term of the initial BEMF measurement;
- and
- processing, by the one or more processing devices, a measured BEMF signal from the intervals of the initial BEMF measurement that have less than or equal to a threshold number of spikes in the change of current term of the initial BEMF measurement.
One or more processing devices comprising:
- means for actuating a voice coil motor (VCM);
- means for switching on measuring a back electromotive force (BEMF) from the VCM for intervals of an initial BEMF measurement that are free of spikes in a change of current term of the initial BEMF measurement;
- and
- means for processing a measured BEMF signal from the intervals of the initial BEMF measurement that are free of spikes in the change of current term of the initial BEMF measurement.
Dependencies are inferred from the claim text.