Stator element

Abstract

A stator element having a yoke is provided. The stator has several laminated metal plates and a number of tooth radially protruding from one side of the yoke. The stator also has a cooling unit providing a path for the flow of a cooling medium along the yoke. The yoke is at least partially provided with a plated metal layer in the region contacted by the cooling unit.

1 .- 14 . (canceled) 
     
     
         15 . A stator element, comprising:
 a yoke comprising a plurality of laminated metal plates and a plurality of tooth radially protruding from one side of the yoke; and   a cooling unit providing a path for a flow of a cooling medium along the yoke,   wherein the yoke comprises a plated metal layer in a region contacted by the cooling unit.   
     
     
         16 . The stator element as claimed in  claim 15 , wherein the cooling unit comprises a cooling channel and/or a cooling cavity. 
     
     
         17 . The stator element as claimed in  claim 16 , wherein the cooling channel and/or the cooling cavity is integrally built inside the yoke. 
     
     
         18 . The stator element as claimed in  claim 17 , wherein the plated metal layer completely surrounds the cooling channel and/or the cooling cavity. 
     
     
         19 . The stator element as claimed in  claim 16 , wherein the cooling channel and/or the cooling cavity directly contacts to the yoke. 
     
     
         20 . The stator element as claimed in  claim 19 , wherein the plated metal layer is disposed in the contact region of the cooling channel and/or the cooling cavity with the yoke. 
     
     
         21 . The stator element as claimed in  claim 20 , wherein the cooling channel and/or the cooling cavity extends in a meander-like shape. 
     
     
         22 . The stator element as claimed in  claim 15 , wherein the cooling unit comprises a first cooling channel and/or a first cooling cavity communicates with a further cooling channel and/or a further cooling cavity and/or a further cooling unit by a hose. 
     
     
         23 . The stator element as claimed in  claim 22 , wherein the further cooling unit supplies the cooling medium. 
     
     
         24 . The stator element as claimed in  claim 15 , wherein the plated metal layer is provided by physical and/or chemical deposition. 
     
     
         25 . The stator element as claimed in  claim 24 , wherein the physical and/or chemical deposition comprises a physical or chemical vapour deposition and/or an electroplating, or a mechanical plating. 
     
     
         26 . The stator element as claimed in  claim 15 , wherein the plated metal layer has a same or a similar coefficient of thermal expansion as the laminated metal plates of the yoke. 
     
     
         27 . The stator element as claimed in  claim 15 , wherein the plated metal layer is made of a same material as the laminated metal plates of the yoke. 
     
     
         28 . The stator element as claimed in  claim 15 , wherein the cooling unit is disposed at a side of the stator element opposite to the tooth. 
     
     
         29 . The stator element as claimed in  claim 15 , wherein the stator element is a ring-shaped stator. 
     
     
         30 . The stator element as claimed in  claim 15 , wherein the stator element is a stator segment to build a ring-shaped stator when assembled. 
     
     
         31 . An electric machine, comprising:
 a rotor; and   a stator comprising:
 a yoke comprising a plurality of laminated metal plates and a plurality of tooth radially protruding from one side of the yoke; and 
 a cooling unit providing a path for a flow of a cooling medium along the yoke, 
 wherein the yoke comprises a plated metal layer in a region contacted by the cooling unit.