Abstract
A high performance focus motor is an essential component in the optical path of a laser memory device. The demand for high performance is due in part to the small depth of focus of the optical system resulting from the high numerical aperture of the lens, in conjuntion with disk wobble and media surface roughness. The need for small overall size and weight adds to the already tough requirements. To obtain the maximum linear acceleration from a given focus motor volume, it is necessary to optimize the magnetic circuit and coil design. This requires one mathematical equation which models the entire electromechanical system. This equation can then be analyzed to discover the optimum values and dimensions for the design. This paper details the creation of such a mathematical equation. It includes, for an example problem, an optimum magnetic circuit and coil design which is within realistic constraints and limitations.
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