Patent ID: 6376945
Filing Date: 2002-04-23
Classification: H02K

Abstract:
An electrical machine comprising:a stator core including a plurality of axially spaced stator core laminations extending normal to an axis of the machine; armature bars passing generally axially through armature bar slots in said laminations; generally radially extending ducts defined in part by duct spacers and said armature bars defining flow paths for flowing a cooling gas through the stator core, the ducts extending between a pair of axially spaced laminations and about said axially extending armature bars; the armature bars and ducts together forming steps in the flow paths and defining first and second radially spaced flow path sections of said ducts, said first flow path sections extending generally radially alongside said armature bars and said second flow path sections lying radially outward of said armature bars and said first flow path sections; and a gas flow transition element located at each step between an armature bar and a duct spacer in each said flow path radially outwardly of said armature bars, each said transition element having a flow surface for transitioning the flow along the duct between said first and second flow path sections thereof to minimize cooling gas flow losses associated with said step.