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A model including NFT slow and fast protrusions and heat transient in HAMR writing is given. The effects of transients on different types of writing are discussed. Based on the model, a pole placement method is proposed to design the parameters for overshoot circuit to handle fast protrusion and heat transient. The alternative method is a discrete solution using deconvolution to generate a table for...
Besides its traditional use in PC and laptop, HDD is being more widely used in the mobile compact computers and portable consumer electronics equipments. The HDD in such environment has more exposure to the external vibrations coming from various sources. On the other hand, TPI increases sharply each year and narrower track pitch makes HDD more vulnerable to the operating vibration. This paper presents...
This paper considers the design of compensator for systems with quantized input in order to reduce the influence of quantization. For systems with (vector) relative degree, we propose a kind of compensator which can compensate for the accumulated output deviation completely caused by quantization. The proposed compensator is capable of keeping the difference of the input-output responses between the...
The applications of HDD in mobile and compact devices pose higher requirement on the vibration rejection capability of HDD servo control. A novel vibration suppression method is proposed in this paper. It is not model based, so it is less sensitive to the variation of the plan parameters. It avoids obtaining disturbance observation by differentiation of position signal. It is an add-on feedforward...
Conventional disturbance observer (DOB) requires plant model inverse to retrieve the input to the actual plant in order to estimate the input disturbance imposed on the plant for compensation. This paper proposes a general form of disturbance observers, which does not need to solve the plant model inverse, and uses H?? control method to design the Q-filter in the disturbance observer. The conventional...
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