 The new connection was named the "Dahlander connection" and a motor having such a configuration is commonly referred to as a "pole changing motor" or a "Dahlander motor".The Dahlander motor is based on a 'consequent pole' connection.The primary factor in determining the speed of an induction motor is the number of poles, given by the formula
where
A regular induction motor has an equal number of opposite poles; that is, at any instant, there are an equal number of North and South magnetic poles.