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Over the past few decade, several novel linear motor topologies including switched reluctance linear motor (SRLM) and doubly salient linear motor (DSLM) have been extensively researched for long distance direct drive applications due to the increasing demand of low cost, low PM consumption and simple structure [1]–[2].
In this paper, we present a theoretical framework and a feasibility study to extract bearing coefficients of a fluid-dynamic bearing (FDB) spindle motor used in hard disk drives (HDD). In this method, the spindle motor is first loaded with a known proof mass instead of disk media. An impact hammer and a laser Doppler vibrometer (or capacitance probe) are used to measure frequency response functions...
We present an analysis of terahertz pulsed imaging (TPI) measurements made on pharmaceutical tablets compacted at a range of compression forces. In particular, we investigate the uniformity and local variations in the refractive index on the surface of tablets of different shapes. Through terahertz imaging it has been possible to observe small-scale deviations on tablet surfaces that may have relevance...
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