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US07068451B1 Disk drive estimating a sinusoidal error in a wedge time period due to eccentricity in disk rotation 失效
磁盘驱动器估计由于盘旋转中的偏心导致的楔形时间段内的正弦误差

Disk drive estimating a sinusoidal error in a wedge time period due to eccentricity in disk rotation
Abstract:
A disk drive and method for estimating a sinusoidal error in a wedge time period is disclosed. An estimated WTP is calculated according to: EST_WTP=RTP+â*cos(2πk/N)+{circumflex over (b)}*sin(2πk/N) wherein RTP is a reference time period corresponding to a nominal WTP, k is an index representing a servo wedge, and {â,{circumflex over (b)}} are adjustable coefficients. A wedge time error e(k) is estimated as the difference between the estimated WTP and a detected actual WTP. The coefficients {â,{circumflex over (b)}} for generating the estimated WTP are adjusted according to: â(k+1)=â(k)−G*e(k)*cos(2πk/N) {circumflex over (b)}(k+1)={circumflex over (b)}(k)−G*e(k)*sin(2πk/N) wherein G is a predetermined gain.
Abstract(Chinese):

公开了一种用于估计楔形时间段中的正弦误差的盘驱动器和方法。 估计的WTP根据以下计算：<？in-line-formula description =“In-line Formulas”end =“lead”？> EST_WTP = RTP +â* cos（2pik / N）+ b * sin（2pik / N ）其中，RTP是与标称WTP对应的基准时间段，k是表示伺服楔的索引，{âb }是可调系数。 估计楔形时间误差e（k）作为估计的WTP与检测到的实际WTP之间的差。 用于生成估计的WTP的系数{â，b}根据：<？in-line-formula description =“In-line Formulas”end =“lead”？>â（k + 1）=â（k） -G * e（k）* cos（2pik / N）<？in-line-formula description =“In-line Formulas”end =“tail”？> <？in-line-formula description =“ “end =”lead“？> b（k + 1）= b（k）-G * e（k）* sin（2pik / N）<？in-line-formula description =”In-line Formulas“end = “尾”→其中G是预定的增益。

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