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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.

Authors: Eguchi, Yochi; Hanada, Toshihide
Affiliation: Pioneer Electronic Corporation, Turntable Production Department, Saitama, Japan
AES Convention:63 (May 1979) Paper Number:1464 Import into BibTeX

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