摘要:
A servo system for displacing a head relative to a disk of a hard disk drive. The servo system comprises a dual-stage actuator, a calibration signal generator, and a calibration factor generator. The calibration signal generator generates a calibration signal having a calibration portion. The calibration factor generator generates a calibration factor. The servo system operates in operating and calibration servo modes. In the operating mode, the system defines first and second servo loops. The calibration factor is used as one of the parameters of the second servo loop. In the calibration servo mode, the calibration signal forms the second control signal, and the calibration factor generator generates the calibration factor based on movement of the head before any substantial response of the third servo loop to the calibration portion.
摘要:
A control system and method for a disk drive comprising first and second actuator arms. The control system comprises first and second stages and a reset system. The first stage displaces the first arm. The second stage displaces the second arm relative to the first arm. The second stage defines a displacement offset when the disk drive begins a seek operation. The reset system discharges at least a portion of the displacement offset over time.
摘要:
The present invention is directed to a push-pin assembly for use with a positioning arm of a disk drive servo writer. The push-pin assembly promotes vibrational damping between the push-pin assembly and the actuator arm. Push-pin assemblies of the invention generally include a contact pin having a shaft and a contact head. The push-pin assembly also includes a body having a contact pin receptacle recessed into an end so that at least a portion of the contact pin shaft can be disposed in the receptacle. The contact head is thus disposed beyond the end of the body which includes the contact pin receptacle. The push-pin assembly additionally includes a vibration damper disposed between at least a portion of the contact pin shaft and the body.
摘要:
A microactuator reference limit used to prevent over-accumulation of internal states may be set based on the microactuator's mechanical properties and is applied at the reference point to the microactuator servo subsystem. A microactuator variable input limit to prevent over-accumulation of internal states may be dynamically determined based on the difference between a signal corresponding to the maximum physical stroke of the microactuator and an estimated motion of the microactuator. Either configuration of servo system automatically ensures that all the internal states of the microactuator controller will not over-react and cause excessive overshoot, sluggish response, and/or saturation.
摘要:
A microactuator reference limit used to prevent over-accumulation of internal states may be set based on the microactuator's mechanical properties and is applied at the reference point to the microactuator servo subsystem. A microactuator variable input limit to prevent over-accumulation of internal states may be dynamically determined based on the difference between a signal corresponding to the maximum physical stroke of the microactuator and an estimated motion of the microactuator. Either configuration of servo system automatically ensures that all the internal states of the microactuator controller will not over-react and cause excessive overshoot, sluggish response, and/or saturation.
摘要:
A disk drive slider positioner (180) includes a frame (184) having a pair of arms (216a, 216b) that cantilever from a base (188). A slider (140) is positioned within frame (184). A pair of slots (224a, 224b) extend down through the frame (184) and also extend along part of the corresponding arm (216a, 216b). Each slot (224a, 224b) includes a corresponding first slot section (228a, 228b) and a wider corresponding second slot section (232a, 232b). A material (240) that is more pliable than the frame (184) preferably occupies the entire length of each first slot section (228a, 228b). Excess first material (240) may overflow into the corresponding wider second slot section (232a, 232b), thereby reducing the potential for excess first material (240) occupying any portion of the space between a leading edge (144) of the slider (140) and the frame (188).
摘要:
A hard disk drive is disclosed comprising at least one disk rotatable about an axis, an actuator assembly moveable relative to the disk, a transducer positioned on the actuator assembly, an actuator signal line, a piezoelectric actuator element disposed on the actuator assembly and electrically interconnected to the actuator signal line, a processor, a sensor signal line and a piezoelectric sensor element for sensing a vibration. The piezoelectric sensor element is collocated with the piezoelectric actuator element and electrically interconnected to the processor by the sensor signal line. The piezoelectric actuator element is operable to move the at least one transducer relative to a surface of the disk. The piezoelectric sensor element is electrically isolated from the piezoelectric actuator element. A method for detecting a vibration in a hard disk drive actuator assembly is also disclosed.
摘要:
A system provided for protecting a disk drive from impact damages. More specifically, a disk drive is provided that includes an accelerometer interconnected to a printed circuit board that detects free fall of the disk drive. In addition, the velocity of spinning disks of the disk drive is also monitored to assess changes in velocity thereof that may indicate the presence of a tumbling condition. Furthermore, the change in acceleration measured by the accelerometer is monitored to prevent false indications of free fall due to common vibrations. Thus an enhanced system is provided that protects disk drives from the effect of free falls under a wide variety of conditions and allowing for drops from shorter distances to be identified.
摘要:
An actuator arm assembly has an actuator arm and an actuator for moving the actuator arm whereby the arm assembly experiences vibrations. The actuator has a body with a recess formed therein, and a strain sensor is fitted essentially inside the recess such that the sensor generates signals correlated to the vibrations. This arrangement produces a high gain boost from the strain based sensor, making an amplifier circuit unnecessary. The sensor signals are used to damp the vibrations.
摘要:
A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of spiral tracks, wherein each spiral track comprising a high frequency signal interrupted at a predetermined interval by a sync mark. An offset r0 representing a difference between an axial rotation of the disk and an axial rotation of the spiral tracks is estimated. Radial dependent timing compensation values are generated in response to the estimated r0. A phase error is generated in response to the sync marks in the spiral track crossings. A control signal is generated in response to the phase error and the radial dependent timing compensation values, and a frequency of an oscillator is adjusted in response to the control signal.