A STATOR FOR AN ELECTRICAL MACHINE OF A WORKING MACHINE

摘要

A stator (100) for an outer rotor electrical machine comprises stator windings (103) and a core structure (101) comprising ferromagnetic material. The core structure comprises a yoke (102) and stator teeth connected to the yoke. The stator comprises a cooling element (104) located in a cavity constituted by the yoke and being in a heat conductive relation with the yoke. The cooling element comprises a first section (105) having a mechanical contact with the yoke and made of first material, and a second section (106) radially surrounded by the first section and having a mechanical contact with the first section. The second section is made of second material whose thermal expansion coefficient is smaller than that of the first material. Thus, the second section acts against loosening of the mechanical contact between the cooling element and the yoke.