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Magnetic bearings for a high-performance optical disk buffer

机译:高性能光盘缓冲器的磁性轴承

摘要

An optical disk buffer concept can provide gigabit-per-second data rates and terabit capacity through the use of arrays of solid state lasers applied to a stack of erasable/reusable optical disks. The RCA optical disk buffer has evoked interest by NASA for space applications. The porous graphite air bearings in the rotary spindle as well as those used in the linear translation of the read/write head would be replaced by magnetic bearings or mechanical (ball or roller) bearings. Based upon past experience, roller or ball bearings for the translation stages are not feasible. Unsatisfactory, although limited experience exists with ball bearing spindles also. Magnetic bearings, however, appear ideally suited for both applications. The use of magnetic bearings is advantageous in the optical disk buffer because of the absence of physical contact between the rotating and stationary members. This frictionless operation leads to extended life and reduced drag. The manufacturing tolerances that are required to fabricate magnetic bearings would also be relaxed from those required for precision ball and gas bearings. Since magnetic bearings require no lubricant, they are inherently compatible with a space (vacuum) environment. Magnetic bearings also allow the dynamics of the rotor/bearing system to be altered through the use of active control. This provides the potential for reduced vibration, extended regions of stable operation, and more precise control of position.
机译:光盘缓冲器概念可以通过使用应用于可擦除/可重复使用的光盘堆栈的固态激光器阵列来提供每秒千兆位的数据速率和千兆位容量。 RCA光盘缓冲区引起了NASA对太空应用的兴趣。旋转主轴中的多孔石墨空气轴承以及读/写头的线性平移中使用的那些将被磁性轴承或机械(滚珠或滚子)轴承取代。根据过去的经验,平移阶段的滚动轴承或滚珠轴承是不可行的。尽管球轴承主轴的经验也很有限,但仍不能令人满意。但是,电磁轴承似乎非常适合这两种应用。磁性轴承在光盘缓冲器中的使用是有利的,因为在旋转和固定构件之间没有物理接触。这种无摩擦的操作可延长使用寿命并减少阻力。制造磁性轴承所需的制造公差也将从用于精密球轴承和气体轴承的公差中得到缓解。由于电磁轴承不需要润滑剂,因此它们固有地与空间(真空)环境兼容。电磁轴承还允许通过使用主动控制来改变转子/轴承系统的动力学。这为减少振动,扩大稳定运行区域以及更精确地控制位置提供了可能。

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