This topic might have a better name.
Dalek motivator, as a different motivator is used by the Ice Warriors. (TV: The Ice Warrior)
Talk about it here.
Dalek motivators were a component of the Dalek casing which allowed them to move and ascend to hover position. (PROSE: Remembrance of the Daleks)
Behind the scenes[]
The Dalek motivator. (NOTVALID: Inside a Skaro Saucer)
In NOTVALID: Inside a Skaro Saucer, motivators are depicted as humongous built-in "caterpillar tracks" which allow a Dalek flying saucer to move on land, crushing cities underfoot. They are occasionally used at the Dalek Commander's command.