Importance

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Abstract

A galvanometer is shown, which includes a cylindrical magnetic rotor polarized into two essentially semi-cylindrical poles on opposite sides of its axis. Two coil portions are disposed on opposite sides of the rotor, separated by a plane of symmetry that is in essential alignment with the poles of the rotor at the center of its range of motion. The legs of each grouping of turns of each coil portion are disposed in a distribution beginning at a point corresponding to the radial surface of the bobbin on which the coil portion is wound, and extending continuously substantially to the plane of symmetry. The distribution may be lower in density at the plane of symmetry than spaced therefrom and may approximate an inverse cosine distribution. A rotor is shown that includes a thin-walled torque-bearing sleeve encircling at least a portion of the magnet and is joined to the output shaft and the magnet. A fastener anchors the bobbin to the shell to prevent relative rotation therebetween. A position transducer is linked to the rotor outside of the space between the bearings to favorably affect the first resonance of the rotor. A winding fixture is shown, and the process of making the coils is described.

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First Claim