As a direct-drive motor rotates, there are action/reaction forces set up between the platter and base (cabinet), and between the motor rotor and stator. These lead to tonearm vibrations which cause poor sound reproduction. This paper describes how these forces can be minimized by adding a second motor or torque generator. The main drive motor and second motor or torque generator are driven in reverse phase, which greatly reduces base (cabinet) vibration in the rotational plane. This technique provides a substantial improvement in tonal quality.

Authors: Fujimoto, Yasuhiro; Suzuki, Masao; Fujio, Kazuyuki; Sasamoto, Katsumi; Satoh, Yuji
Affiliation: Sansui Electric Co., Ltd., Suginami-ku, Tokyo, Japan
AES Convention: 70 (October 1981) Paper Number: 1837
Publication Date: October 1, 1981 Import into BibTeX
Subject: Disk Reproduction and Broadcast
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=11917

Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $33 for non-members and is free for AES members and E-Library subscribers.

Learn more about the AES E-Library

E-Library Location: (CD aes10)   /pp8185/pp8110/1925.pdf

Start a discussion about this paper!