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An areal density in magnetic recording commercialization hard disk drives(HDD) is 1.2 TB/in2. It will be 1.5 TB/in2 in 2016. The head-positioning control should be more accuracy because of the high magnetic density in HDD. Previous studies of head-positioning control are considered pivot friction torque or dual actuator control system[1,2]. These are not considered structural characteristic of pivot...
Electromagnetic actuators are versatile and able to meet demanding requirements, such as operation in very low or very high temperatures. When the actuator is used in a high-temperature environment, we need to know how the force-producing capability of the actuator is influenced by the operating temperature. Previous research works [1-2] fail to show the dependence of the actuator force on the temperature.
When a magnetostrictive actuator (MA) is designed, it is general to use a bias magnetic field for various purposes. One of them is to design a bidirectional MA. It is also expected that the performance of the MA can be fully utilized. The way to impose the bias magnetic field can be classified into the use of a solenoid or a permanent magnet (PM). The PM is preferred to the solenoid due to volume...
The author presents a three degrees-of-freedom precision hybrid stage that can move and align an object on it for the measurement of its three-dimensional image using the confocal scanning microscope. The hybrid stage consists of two individually operating x - y - thetas stages, called the coarse stage and the fine stage. The coarse stage is driven by the three linear motors and produces the initial...
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