Abstract
A conventional spin-stand system which used to evaluate read-write performance of magnetic recording heads and media can not allow thermal drift of its mechanism and run out of its air spindle motor. Therefore, we propose a precise tracking actuator for the spin-stand system like a piggyback actuator. The actuator constructed with a piezoelectric element(PZT) and a stroke amplifying mechanism. We applied a robust controller using Η_∞ control theory for the tracking actuator, The designed system showed good controllability guaranteeing the control performance for two kinds of HGA(Head Gimbals Assembly) fixture (0.2g fixture and 2.0g fixture).
