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US 9,310,179 B2Granted
Spindle force actuator
AssigneeSeagate Technology LLC
InventorHans Leuthold
Life of this patent
Estimating the term…
Abstract
An apparatus includes a circuit, a code modulator, and an actuator. The circuit is operable to detect displacements of a rotating object while in motion. The circuit is operable to detect a position of the displacements and to generate a signal associated therewith. The code modulator is operable to generate a modulated signal based on the position and the displacements. The actuator is operable to apply a force to the rotating object, wherein the force is based on the modulated signal.
Claims20
An apparatus comprising:
- a plurality of sensors operable to detect displacements of a spindle in motion;
- a converter coupled to said plurality of sensors, wherein said converter is operable to determine respective positions of said displacements;
- a filter operable to determine instantaneous velocity associated with said positions of said displacements and further operable to determine a first force based on said instantaneous velocity wherein the determining by the filter is based on the received said positions of said displacement and further based on a received position of a rotating electrical field;
- and
- an actuator operable to apply a second force to said spindle, wherein said second force substantially counteracts said first force and said displacements.
2 more elements
An apparatus comprising:
- a circuit operable to detect displacements of a rotating object, wherein said circuit is operable to detect a positions of said displacements, and wherein said circuit is further operable to generate a signal associated with said position and said displacements;
- a code modulator operable to generate a modulated signal based on said position and said displacements;
- and
- an actuator operable to apply a force to said rotating object, wherein said force is based on activation of a subset of coils in a plurality of coils, wherein the activation is based on said modulated signal, and wherein the plurality of coils comprises an even winding coil and an odd winding coil, and wherein at least one coil in the plurality of coils has a different number of windings than another coil in the plurality of coils.
1 more element
An apparatus comprising:
- a first plurality of teeth having a first plurality of coil windings;
- a second plurality of teeth having a second plurality of coil windings;
- and
- a plurality of switches, wherein
- each switch of said plurality of switches is associated with a tooth of said first plurality of teeth or a tooth of said second plurality of teeth,
- at least one switch of said plurality of switches associated with said first plurality of teeth and at least one switch of said plurality of switches associated with said second plurality of teeth are operable to be turned on in response to a signal,
- said signal is associated with a force, a position of displacement of a rotating object, and an instantaneous velocity at said position of displacement, and
- said turning on of said switches is operable to apply a cancelation force to said rotating object to substantially adjust for said displacements.
5 more elements
Dependencies are inferred from the claim text.