Electric machine having magnetic bearing means

摘要

An electric machine comprises a stator 7 and a rotor 17 mounted on a rotor shaft 15. In order to preclude axial vibrations of the rotor shaft the machine is provided with a first magnet 19a incorporated in a thrust block 19 and a second magnet 23 on the rotor shaft. The first and second magnetic means cooperate with each other to urge a bearing portion 15a of the rotor shaft against a bearing surface 19b of the thrust bearing with a predetermined pressure.