Title :
A nonlinearity specification for constructing the servo position error signal
Author_Institution :
Texas Instrum. Inc., San Jose, CA, USA
fDate :
3/1/1997 12:00:00 AM
Abstract :
A high performance disk file actuator servo requires a position transducer whose response is linear with displacement. Two concerns that detrimentally affect positional linearity are the nonlinear response of the burst detector to burst amplitude and the nonuniform sensitivity of the magnetic read element across its pole faces. Nonuniform field sensitivity is of particular concern with the advent of magneto resistive heads for embedded servo systems, and this paper gives specification for both for good actuator positioning
Keywords :
electric actuators; error analysis; magnetic heads; magnetic recording; magnetoresistive devices; position control; position measurement; servomechanisms; burst amplitude; burst detector; displacement; embedded servo systems; good actuator positioning; high performance disk file actuator servo; magnetic disk drive controls; magnetic head positioning system; magnetic read element; magneto resistive heads; nonlinear response; nonlinearity specification; nonuniform field sensitivity; nonuniform sensitivity; pole faces; position transducer; positional linearity; response; servo position error signal; Face detection; Hydraulic actuators; Linearity; Magnetic heads; Magnetic properties; Magnetic recording; Servomechanisms; Signal processing; Transducers; Tunneling magnetoresistance;
Journal_Title :
Magnetics, IEEE Transactions on
