Cooling Device for a Stator of an Electrical Machine, Electrical Machine and Motor Vehicle

A cooling device for a stator of an electric machine, for fitting together with a hollow-cylindrical laminated core of the stator, the cooling device comprising:

• a plurality of cooling ducts for directing cooling fluid along the laminated core;
• and
• a fluid ring which, for disposing on an end side of the laminated core, is connected to the cooling ducts and, in a flow direction oriented along a circumferential direction, is able to be passed through by a flow of cooling fluid, wherein:
• the fluid ring comprises:
• two fluid ring ducts comprising a distribution duct for distributing the cooling fluid to the cooling ducts and a collection duct for receiving the cooling fluid from the cooling ducts, and
• at least two cooling fluid connectors comprising at least one inflow connector for directing the cooling fluid into the distribution duct and at least one outflow connector for retrieving the cooling fluid from the collection duct,
• the fluid ring ducts, for uniformly distributing the cooling fluid to the cooling ducts, in the flow direction have flow cross sections which are a function of a circumferential angle,
• the distribution duct is configured with a first flow cross section which, proceeding from the at least one inflow connector, decreases as a number of cooling ducts already supplied with cooling fluid increases, and
• the collection duct is configured with a second flow cross section which increases as a number of already emptied cooling ducts increases toward the at least one outflow connector.