Patent ID: 7841309

Claim:
Gas exchange valve actuator for a valve-controlled internal combustion engine, said actuator, comprising: a rotor ( 16 ), which is to be coupled to a valve member ( 12 ), and a stator ( 18 ), wherein the rotor ( 16 ) has at least one stack ( 14 , 14 ′) of superposed permanently magnetic bars ( 30 , 30 ′), and the stator ( 18 ) is formed, at least partially, from a soft-magnetic material and has at least one pair of teeth ( 22 a , 22 a ′; 22 b , 22 b ′; 22 c , 22 c ′; 22 d , 22 d ′; 22 e , 22 e ′; 22 f , 22 f ′) with mutually opposed teeth ( 22 ), of which each pair of teeth receives a stack ( 14 , 14 ′) between them while forming an air gap ( 24 , 24 ′) in each case, and wherein the stator ( 18 ) has at least two magnetically conductive inner regions ( 50 , 50 a ) which are arranged at a predetermined distance A from one another in the direction of movement B of the rotor ( 16 ) and are at least partially surrounded, in each case, by a hollow-cylindrical coil arrangement ( 60 , 60 a ), the central longitudinal axis M of which is oriented approximately transversely to the direction of movement B of the rotor ( 16 ).