What is a "digital" motor?
Unfortunately the term digital seems to be applied inappropriately to all sorts of things.

Here is a good video from the EEVBlog taking Dyson to task for their "Dyson digital motor".

Here is Dyson's take where they say "Dyson digital motors use digital pulse technology, spinning at up to 104,000 times a minute"

Then again, most switches to turn a motor on or off are digital, binary in fact ;-)