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Active runout cancellation for fine-seeking control in optical disk drives

机译：主动跳动消除功能，用于光盘驱动器的精细控制

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摘要

The fine-seeking control, one of the radial positioning servo functions on the optical disk drives, seeks a limited number of tracks forward or backward. Two properties, noted as controllable seeking velocity and achievable settling, are important issues for fine-seeking performance. Unless these performances are satisfied, the settling down track cannot be guaranteed to be the desired track; hence, additional seeking is required to come forward to the destination track. Owing to the periodic runout effects, the conventional feedback approaches are difficult to achieve stable velocity control and satisfactory settling performance for high spindle speed operation. This paper proposes the extended usage of frequency adaptive control technique (FACT) for active runout suppression on fine seeking. It is shown that the runout effects can be isolated from the servo systems as long as the FACT is applied. A mode switching control approach is then introduced to switch the adaptation between the track-following and fine-seeking processes. This leads to an efficient compensation for periodic runout, thereby eliminating the direction hysteresis in fine seeking. Experimental results are shown to be effective for the performance on both velocity control and settling behavior after seeking.
机译：精细搜索控制是光盘驱动器上的径向定位伺服功能之一，它可以向前或向后搜索有限数量的磁道。注意到两个特性，即可控的搜索速度和可实现的沉降，是进行精细搜索的重要问题。除非满足这些性能，否则不能保证沉降轨道是所需的轨道;因此，需要额外的搜索才能到达目的地轨道。由于周期性的跳动效应，传统的反馈方法难以实现稳定的速度控制和令人满意的高主轴转速运行的稳定性能。本文提出了将频率自适应控制技术（FACT）扩展用于精细搜索的主动跳动抑制。结果表明，只要应用FACT，跳动效果就可以与伺服系统隔离。然后引入模式切换控制方法，以在跟踪跟进和精细搜索过程之间切换适应性。这导致对周期性跳动的有效补偿，从而消除了精细寻找中的方向滞后。实验结果表明，对于寻找后的速度控制和沉降行为而言，其性能都是有效的。

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