Title :
PZT crack detection in suspension-based dual stage actuator [for HDDs]
Author :
Yeh, Yung-Ping ; McCaslin, Marty ; Ku, C. P Roger
Author_Institution :
Dept. of Mech. Eng., California Univ., San Diego, La Jolla, CA, USA
fDate :
9/1/2000 12:00:00 AM
Abstract :
An impedance method is proposed to detect cracks of PZT bars in suspension based dual stage-actuators. The frequency response amplitude of impedance at the resonance of 1.95 MHz, the PZT bar width extension mode, was very sensitive to the cracks in PZT material. As cracks in the PZT bars propagated from invisible micro cracks to visible macro cracks, the impedance gain at 1.95 MHz dropped suddenly
Keywords :
crack detection; disc drives; frequency response; hard discs; lead compounds; microactuators; piezoelectric actuators; 1.95 MHz; PZT; PbZrO3TiO3; bar width extension mode; crack detection; frequency response amplitude; impedance method; invisible micro cracks; microactuators; suspension-based dual stage actuator; visible macro cracks; Actuators; Assembly; Bandwidth; Bars; Circuit synthesis; Circuit testing; Frequency; Impedance; Microactuators; Servomechanisms;
Journal_Title :
Magnetics, IEEE Transactions on
