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A New Phonograph Motor with Stable Hanging Rotor
In the conventional phonograph motor, the bearing which supports the rotor is placed underneath the spindle. In such designs, the wow and flutter cannot be reduced below approximately 0.01%, even with the use of a slotless and coreless motor. In the newly developed phonograph motor, the thrust bearing is located near the top of the spindle producing the hanging rotor design which has the following features: 1) A slotless and coreless motor resulting in very low wow and flutter of less than 0.003% WRMS, 2) a motor design using dual anisotropic ferrite ring magnets produces a large torque of 10-Kg-cm resulting in a start up time of less than 0.3 seconds, and 3) a motor having a precise speed sensor permitting PLL speed control to the accuracy of a quarts crystal.
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