Disk drive with hybrid analog-digital acceleration...

Details Disk drive with hybrid analog-digital acceleration... Disk drive with hybrid analog-digital acceleration...

2007-01-02

2009-08-25

Sniezek, Andrew L (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S078040, C360S075000

Reexamination Certificate

active

07580217

ABSTRACT:
A disk drive uses a hybrid analog-digital acceleration feedforward control system and method for cancellation of rotational disturbances. A rotational vibration (RV) sensor is used with an analog circuit to generate an analog feedforward signal that is summed with the analog actuator control signal from the servo control processor. The analog feedforward signal is also converted to a digital feedforward signal and input to the processor. When the actuator gain deviates from its design value, the processor retrieves the appropriate actuator gain value from a lookup table. The processor uses the actuator gain value and the digital feedforward signal to calculate a modified feedforward signal, which is a fraction of the digital feedforward signal. The processor also calculates a feedback control value from the servo positioning information and a feedback controller. The modified feedforward signal is then summed with the feedback control value to generate the digital actuator control signal, which is converted to the analog actuator control signal. If the actuator gain is at its design value, the calculated modified feedforward signal is zero so the digital feedforward signal is not used.

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patent: 7177113 (2007-02-01), Semba et al.
Abramovitch, “Rejecting Rotational Disturbances on Small Disk Drives Using Rotational Accelerometers,” Proc of the 1996 IFAC World Cong, San Fran, CA, Jul. 1996, pp. 1-6.
Jinzenji et al., “Acceleration Feedforward Control Against Rotational Disturbance in Hard Disk Drives,” IEEE Transactions on Magnetics, vol. 37, No. 2, Mar. 2001, pp. 888-893.
White et al., “Increased Disturbance Rejection in Magnetic Disk Drives by Acceleration Feedforward Control,” Proc of the 1996 IFAC World Cong, San Fran, CA, 1996, pp. 489-494.

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