TMD = Transrotor Magnet Drive
Using a ring bearing surrounding the platter bearing underneath the subplatter driven by a belt. The ring bearing holds the magnets that attacts the magnets in the subplatter above. This ring bearing is still mounted on the same plinth as the main bearing.
Diagram of TMD- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
FMD = Free Magnet Drive
Using a belt-drive motor pod underneath the turntable. The motor pod holds the magnet that attracts the magnets in the subplatter above. FMD differs from TMD is that FMD is completely mechanically separated from the turntable above. Similar system in the Clearaudio Statement and EAR Disk Master.
Diagram of FMD . . . and . . .
more pictures.
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