Electrical machine with improved cooling

摘要

An electrical machine (1) comprises a rotor (2) capable of rotation about a longitudinal axis (3) and a stator having a core (4) disposed coaxially around the rotor (2). The core (4) comprises a radially outward base portion (21) from which a plurality of teeth (22) extend radially inwardly toward the rotor (2), each tooth (22) having an end face (23) that is separated from the rotor by gap (8) that defines a passageway for flow a first portion of a cooling medium (6a) between the rotor (2) and the core (4) of the stator. In accordance with the present invention, each said end face (23) comprises a curved first surface (23) in contact with said cooling medium (6a) flowing axially through said gap (8).