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January 30, 2014

Mtg: History of the Magnetics and Control of Actuators in Disk Drives

by @ 10:16 am. Filed under ALL, Computers/Software, Electronics Design
 

TUESDAY February 18, 2014
SCV Magnetics Chapter
– position and velocity feedback, torque factor, inertia …
Speaker: Dr. Art Wagner, consultant
Time: Networking and pizza at 6:45 PM; Presentations at 7:30 PM
Cost: none
Place: Western Digital, 1710 Automation Parkway, San Jose
RSVP: not required
Web: ewh.ieee.org/r6/scv/mag

In computer systems, an important data storage medium, beginning in the 1950s until today, is the Hard Disk Drive (HDD).  Using magnetic heads, the HDD reads and writes data on magnetic surfaces of spinning disks.  A disk drive actuator positions the magnetic heads on data using a combination of position and velocity feedback control.  An engineer configures an actuator from magnets, steel, a coil, bearings, and head arms.  The presentation centers on the progression of actuator configurations.  The talk pays attention to parameters important for control, such as the force factor or torque factor, mass or inertia, and coil resistance.  In this presentation, we discuss configuration evolution from typical early actuators to configurations prevalent in todayâ??s actuators and control.  We answer the question: what has changed, what is the same?

20140218scv

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