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By Abdullah Al Mamun
The harddisk is without doubt one of the best examples of the precision regulate of mechatronics, with tolerances lower than one micrometer completed whereas working at excessive pace. expanding call for for greater facts density in addition to disturbance-prone working environments proceed to check designers' mettle. discover the demanding situations awarded by way of sleek harddisk drives and tips on how to conquer them with hard disk: Mechatronics and Control.
Beginning with an outline of hard disk background, elements, working rules, and traits, the authors completely learn the layout and production demanding situations. they begin with the top positioning servomechanism by means of the layout of the actuator servo controller, the severe elements of spindle motor regulate, and at last, the servo tune author, a severe expertise in hard drive production. by way of evaluating a number of layout ways for either unmarried- and dual-stage servomechanisms, the ebook exhibits the relative execs and cons of every process. quite a few examples and figures make clear and illustrate the discussion.
Exploring functional concerns resembling types for crops, noise relief, disturbances, and customary issues of spindle automobiles, harddisk: Mechatronics and keep watch over avoids heavy concept in desire of delivering hands-on perception into genuine concerns dealing with designers on a daily basis
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Extra info for Hard Disk Drive: Mechatronics and Control
Sample text
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.
Demagnetization curve of the PM material . . . . . . Demagnetization curve and load line . . . . . . . . Magnetic field generated by the distributed winding with 1 polepair . . . . . . . . . . . . . . . . . Cross-section of the motor showing the integration loops . . The reluctances in the loop circuit . . . . . . . . The MMF waveform of the distributed conductors . . . . The distributed winding with 2 magnetic pole-pairs .
2 Trend in track density, linear density, and bit aspect ratio . . Dimensions in drives of diļ¬erent form factors . . . . . 4 Applications of various filters . . . . . . . . . . The relationship between the corresponding modes of disk flutter and the PES . . . . . . . . . . . . . The amplitude of dominant modes in PES spectrum before and after compensation. . . . . . . . . . . . . Parameters of a PZT actuated suspension model . . . . Specifications for Dual-stage Control Design Example .