Cooling of an electric machine

An electrical machine, comprising:

• a stator laminated core having a stator laminated core surface and including a stator winding with a winding overhang which is sized to project into a winding head space on a face of the stator laminated core;
• a housing surrounding the stator laminated core and the winding overhang;
• and
• first and second stator core support rings arranged on the stator laminated core surface between the housing and the stator laminated core and axially spaced from each other at a predefined distance, said first and second stator core support rings radially surrounding the stator laminated core, with a cavity being formed between the housing, the stator laminated core surface and the first and second stator core support rings, said housing having an inlet bore arranged between the first and second stator core support rings and adapted to fluidically couple an external area of the housing and the cavity,
• wherein the stator laminated core has a cooling channel which is fluidically coupled with the cavity via a channel entry arranged centrally in the middle of the stator laminated core, thereby creating a T-shaped form of the cooling channel in conjunction with the channel entry so that a stream of coolant is not heated over an entire length of the stator laminated core, but only over a shorter stretch as a result of the T-shaped form.

A method for cooling an electrical machine having a housing, comprising:

• radially conveying coolant through an inlet bore of the housing of the electric machine;
• backing-up the coolant in a cavity bounded by first and second stator core support rings arranged between the housing and a stator laminated of the electric machine;
• radially conveying the coolant through a channel entry, arranged centrally in the middle of the stator laminated core, to a T-shaped cooling channel of the stator laminated core;
• diverting the coolant through the cooling channel in an axial direction;
• and
• axially conveying the coolant starting from the middle of the stator laminated core through the cooling channel so that a stream of coolant does not heat up over an entire length of the stator laminated core, but only over a shorter stretch as a result of the T-shaped form of the cooling channel.

A vertical mill, comprising an electrical machine, said electric machine comprising a stator laminated core having a stator laminated core surface and including a stator winding with a winding overhang which is sized to project into a winding head space on a face of the stator laminated core, a housing surrounding the stator laminated core and the winding overhang, and first and second stator core support rings arranged on the stator laminated core surface between the housing and the stator laminated core and axially spaced from each other at a predefined distance, said first and second stator core support rings radially surrounding the stator laminated core, with a cavity being formed between the housing, the stator laminated core surface and the first and second stator core support rings, said housing having an inlet bore arranged between the first and second stator core support rings and adapted to fluidically couple an external area of the housing and the cavity, wherein the stator laminated core has a cooling channel which is fluidically coupled with the cavity via a channel entry arranged centrally in the middle of the stator laminated core, thereby creating a T-shaped form of the cooling channel in conjunction with the channel entry so that a stream of coolant is not heated over an entire length of the stator laminated core, but only over a shorter stretch as a result of the T-shaped form.