With belt and idler drives, the mechanical diagrams were pretty much self explanatory. These are not very helpful in understanding direct drives. All the cool things are in how the motor itself is designed and driven. Shall we have a closer look at one?
For illustration purposes, we will use a high quality first generation motor: Dual EDS 900
. Just like with digital audio a decade later, the caliber of engineers working on early direct drives was often a lot higher than during the technology's supposed "maturity". If you don't believe me, compare the sonic quality of Donald Fagen's fully digital "The Nightfly"
from 1982 with anything recorded in the 1990s.
If you are not familiar with the way brushless motors work, I can recommed the following tutorial
. Otherwise understanding of what follows might be a bit challenging.