This paper presents an initial friction compensation by a disturbance observer which is
designed on the basis of a rolling friction model (RFM) for the fast and precise positioning of …

Hard disk drives (HDDs) used for data servers are exposed to various vibrations. These
vibrations are mainly caused by the cooling fan that controls the temperature inside the …

This paper proposes a new application for the rotary voice coil motor (VCM). In developing a
low-cost ultrasound scanner for the developing world, an oscillating transducer is required to …

High-precision stages are industrial equipment used in micro-fabrications. Fast and precise
positioning control is a very important technology for improving the throughput and the …

A unified tuning rule for the motion profiles is newly proposed to reduce the residual
vibration. For several motion profiles, including trapezoidal velocity profile, S-curve, and …

This paper presents the experimental observation results of contact-induced vibration (CIV)
and its compensator design in dual-stage hard disk drive servo systems, where the vibration …

This paper presents a novel adaptive feedforward (FF) compensation on the basis of the
deadbeat control framework for the fast and precise positioning of high-performance …

Head positioning control systems are required to improve the positioning accuracy and thus
increase the recording capacity of hard disk drives (HDDs). Existing head positioning control …

To improve positioning accuracy in a head-positioning control system for hard disk drives,
we have developed a triple-stage-actuator system on a spin-stand tester. In this system, the …

A large-scale high-precision scan stage is important equipment in the industrial productions
of micro-fabrication such as flat panel display (FPD) lithography systems. Designing …