Hard Disk Drive: Mechatronics and Control by Abdullah Al Mamun

By Abdullah Al Mamun

The hard disk is among the best examples of the precision regulate of mechatronics, with tolerances lower than one micrometer accomplished whereas working at excessive pace. expanding call for for better information density in addition to disturbance-prone working environments proceed to check designers mettle.

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Extra info for Hard Disk Drive: Mechatronics and Control

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97 Open loop Bode plots. . . . . . . . . . . . 98 Sensitivity function (S) and Complementary sensitivity function (T ). . . . . . . . . . . . . . . . . 99 Response to 4 µin step input. Upper curve: combined output yp , lower curve: microactuator control voltage uM . . . . 100 Response to 10 µin step input with linear control scheme. Upper curve: combined output yp , lower curve: microactuator control voltage uM . . . . . . . . . .

69 Plan view of a microactuator design. . . . . . . . 7 kHz. 4 kHz in the XZ plane. . . . . . . 72 Configuration of parallel structure. . . . . . . . . 73 Open loop transfer function. Solid line: combined loop, dashdot line: VCM path, dashed line: PZT path. . . . . . 74 S (solid) and T (dashed line) for parallel structure. . . . 75 Dual-stage actuator system block diagram. . . . . . 76 Frequency response of the closed-loop system. . . . . . 5 sin(200πt) + sin(8000πt).

97 Open loop Bode plots. . . . . . . . . . . . 98 Sensitivity function (S) and Complementary sensitivity function (T ). . . . . . . . . . . . . . . . . 99 Response to 4 µin step input. Upper curve: combined output yp , lower curve: microactuator control voltage uM . . . . 100 Response to 10 µin step input with linear control scheme. Upper curve: combined output yp , lower curve: microactuator control voltage uM . . . . .

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