Patent ID: 7923877

Claim:
A direct current motor with permanent magnet stator, comprising a rotor ( 3 ) with a respective winding ( 4 ) and at least four stator poles ( 5 , 6 , 7 , 8 ) angularly spaced about the rotation axis (A) of the rotor ( 3 ), an outer casing ( 2 ), at least two positively polarized brushes ( 11 , 12 ) and at least two negatively polarized brushes ( 13 , 14 ) where the positively polarized brushes ( 11 , 12 ) are radially aligned with respective stator poles ( 5 , 7 ) and the two negatively polarized brushes ( 13 , 14 ) are angularly spaced, each on one side opposite the other, between the positively polarized brushes ( 11 , 12 ), wherein: the rotor winding ( 4 ) can be powered partially and selectively at least at two fixed, explementary angular sectors, the stator poles ( 5 , 6 , 7 , 8 ) generate a magnetic field that is asymmetrical about the rotation axis (A) of the rotor ( 3 ), and the negatively polarized brushes ( 13 , 14 ) are electrically connected to each other, while at least two positively polarized brushes ( 11 , 12 ) are electrically isolated from each other, are radially aligned, respectively, with a first stator pole ( 5 ) and with a second stator pole ( 7 ) that have different magnetic properties and can be selectively powered so that can drive the motor ( 1 ) at a respective speed.