Patent Number: 8,878,404

Title: Arrangement and method for cooling an electrical machine

Abstract: In an arrangement for cooling an electrical machine, the electrical machine includes a rotor and a stator located at the end of an air gap from the rotor. The rotor includes at least one axial cooling channel originating from the first end of the rotor that is connected to at least two axially successive cooling channels that are substantially radial within the rotor. The stator is made of sheets using axially successive core modules. The stator includes a radial cooling channel between two core modules. Gaseous cooling agent is led to the cooling channels of the rotor and stator from the end of the rotor. The outer surface of the stator core module includes a cooling jacket by the length (L) of the stator core module at maximum, and liquid cooling agent is led to the cooling jacket.

Inventors: Maki-Ontto; Petri (Espoo, FI), Tyllinen; Yrjo (Tervakoski, FI), Kanninen; Pekka (Espoo, FI)

Assignee: ABB Technology AG

International Classification: H02K 9/00 (20060101)

Expiration Date: 2019-11-04 0:00:00