On the Dyson website they promote their new motor by saying:
Dyson Hyperdymium™ motors work very differently to conventional brushed motors. We replaced the brush with digital pulse technology, added neodymium magnets and built a ceramic shaft that's three times stronger than steel. This makes our motors durable and powerful, yet smaller, lighter and cleaner than ever before.
I find it odd that they are referring to their motor as a brushed motor, having replaced the brushes - as opposed to simply calling it a brushless motor.
To my knowledge, the main difference between brushed and brushless motors is that on a brushed motor the coils are on the rotor and the magnet on the stator, and with a brushless motor, this is the other way around.
I am having trouble finding any in-depth information about Dyson's motor, but from these two images on their website:
it looks like the coils could be on the rotor - which would explain why they are referring to it as a brushed motor, but without brushes.
Is this the case? Is there a semantic difference between a "brushless motor" and a "motor without brushes", or are Dyson trying to be sneaky and imply that they invented the brushless motor...?