A New Phonograph Motor with Stable Hanging Rotor

Eguchi Y, Hanada T. A New Phonograph Motor with Stable Hanging Rotor. In: AES Convention 63. Audio Engineering Society; 1979.pp. 1464:1-40. Available from: https://aes.org/publications/elibrary-page/?id=2890

@inproceedings{Eguchi1979_2890,
  author = {Eguchi, Yochi and Hanada, Toshihide},
  title = {{A New Phonograph Motor with Stable Hanging Rotor}},
  booktitle = {AES Convention 63},
  pages = {1464:1-40},
  url = {https://aes.org/publications/elibrary-page/?id=2890},
  year = {1979},
  month = may,
  publisher = {Audio Engineering Society}
}

TY  - CPAPER
TI  - A New Phonograph Motor with Stable Hanging Rotor
AU  - Eguchi, Yochi
AU  - Hanada, Toshihide
T2  - AES Convention 63
SP  - 1
EP  - 40
M1  - Paper 1464
PY  - 1979
DA  - 1979/05/06
UR  - https://aes.org/publications/elibrary-page/?id=2890
PB  - Audio Engineering Society
LA  - en
AB  - 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.
ER  -